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Adding some more java stuff

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Michael Reber 4 years ago
parent b880c3ccde
commit 599b63599b
25 changed files with 1949 additions and 0 deletions
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137
java/CLChat Client.java
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CLChat Client
import java.net.*;
import java.io.*;
public class CLChatClient {
static final int DEFAULT_PORT = 1728; // Port where server is
// listening, if no
// port is specified
// on the command line.
static final String HANDSHAKE = "CLChat"; // Handshake string.
// Each end of the connection sends this string
// to the other just after the connection is
// opened. This is done to confirm that the
// program on the other side of the connection
// is a CLChat program.
static final char MESSAGE = '0'; // This character is prepended
// to every message that is sent.
static final char CLOSE = '1'; // This character is sent to
// the connected program when
// the user quits.
public static void main(String[] args) {
String computer; // The computer where the server is running,
// as specified on the command line. It can
// be either an IP number or a domain name.
int port; // The port on which the server listens.
Socket connection; // For communication with the server.
TextReader incoming; // Stream for receiving data from server.
PrintWriter outgoing; // Stream for sending data to server.
String messageOut; // A message to be sent to the server.
String messageIn; // A message received from the server.
/* First, get the computer from the command line.
Get the port from the command line, if one is specified,
or use the default port if none is specified. */
if (args.length == 0) {
TextIO.putln("Usage: java SimpleClient <computer-name> [<port>]");
return;
}
computer = args[0];
if (args.length == 1)
port = DEFAULT_PORT;
else {
try {
port= Integer.parseInt(args[1]);
if (port <= 0 || port > 65535)
throw new NumberFormatException();
}
catch (NumberFormatException e) {
TextIO.putln("Illegal port number, " + args[1]);
return;
}
}
/* Open a connetion to the server. Create streams for
communication and exchange the handshake. */
try {
TextIO.putln("Connecting to " + computer + " on port " + port);
connection = new Socket(computer,port);
incoming = new TextReader(connection.getInputStream());
outgoing = new PrintWriter(connection.getOutputStream());
outgoing.println(HANDSHAKE);
outgoing.flush();
messageIn = incoming.getln();
if (! messageIn.equals(HANDSHAKE) ) {
throw new IOException("Connected program is not CLChat!");
}
TextIO.putln("Connected. Enter your first message.
");
}
catch (Exception e) {
TextIO.putln("An error occurred while opening connection.");
TextIO.putln(e.toString());
return;
}
/* Exchange messages with the other end of the connection
until one side or the other closes the connection.
This client program send the first message. After that,
messages alternate strictly back an forth. */
try {
while (true) {
TextIO.put("SEND: ");
messageOut = TextIO.getln();
if (messageOut.equalsIgnoreCase("quit")) {
// User wants to quit. Inform the other side
// of the connection, then close the connection.
outgoing.println(CLOSE);
outgoing.flush();
connection.close();
TextIO.putln("Connection closed.");
break;
}
outgoing.println(MESSAGE + messageOut);
outgoing.flush();
if (outgoing.checkError()) {
throw new IOException("Error ocurred while reading incoming message.");
}
TextIO.putln("WAITING...");
messageIn = incoming.getln();
if (messageIn.length() > 0) {
// The first character of the message is a command.
// If the command is CLOSE, then the connection
// is closed. Otherwise, remove the command
// character from the message and procede.
if (messageIn.charAt(0) == CLOSE) {
TextIO.putln("Connection closed at other end.");
connection.close();
break;
}
messageIn = messageIn.substring(1);
}
TextIO.putln("RECEIVED: " + messageIn);
}
}
catch (Exception e) {
TextIO.putln("Sorry, an error has occurred. Connection lost.");
TextIO.putln(e.toString());
System.exit(1);
}
} // end main()
} //end class CLChatClient

129
java/CLChatServer.java
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CLChatServer
import java.net.*;
import java.io.*;
public class CLChatServer {
static final int DEFAULT_PORT = 1728; // Port to listen on,
// if none is specified
// on the command line.
static final String HANDSHAKE = "CLChat"; // Handshake string.
// Each end of the connection sends this string
// to the other just after the connection is
// opened. This is done to confirm that the
// program on the other side of the connection
// is a CLChat program.
static final char MESSAGE = '0'; // This character is prepended
// to every message that is sent.
static final char CLOSE = '1'; // This character is sent to
// the connected program when
// the user quits.
public static void main(String[] args) {
int port; // The port on which the server listens.
ServerSocket listener; // Listens for a connection request.
Socket connection; // For communication with the client.
TextReader incoming; // Stream for receiving data from client.
PrintWriter outgoing; // Stream for sending data to client.
String messageOut; // A message to be sent to the client.
String messageIn; // A message received from the client.
/* First, get the port number from the command line,
or use the default port if none is specified. */
if (args.length == 0)
port = DEFAULT_PORT;
else {
try {
port= Integer.parseInt(args[0]);
if (port < 0 || port > 65535)
throw new NumberFormatException();
}
catch (NumberFormatException e) {
TextIO.putln("Illegal port number, " + args[0]);
return;
}
}
/* Wait for a connection request. When it arrives, close
down the listener. Create streams for communication
and exchange the handshake. */
try {
listener = new ServerSocket(port);
TextIO.putln("Listening on port " + listener.getLocalPort());
connection = listener.accept();
listener.close();
incoming = new TextReader(connection.getInputStream());
outgoing = new PrintWriter(connection.getOutputStream());
outgoing.println(HANDSHAKE);
outgoing.flush();
messageIn = incoming.getln();
if (! messageIn.equals(HANDSHAKE) ) {
throw new IOException("Connected program is not CLChat!");
}
TextIO.putln("Connected. Waiting for the first message.
");
}
catch (Exception e) {
TextIO.putln("An error occurred while opening connection.");
TextIO.putln(e.toString());
return;
}
/* Exchange messages with the other end of the connection
until one side or the other closes the connection.
This server program waits for the first message from
the client. After that, messages alternate strictly
back an forth. */
try {
while (true) {
TextIO.putln("WAITING...");
messageIn = incoming.getln();
if (messageIn.length() > 0) {
// The first character of the message is a command.
// If the command is CLOSE, then the connection
// is closed. Otherwise, remove the command
// character from the message and procede.
if (messageIn.charAt(0) == CLOSE) {
TextIO.putln("Connection closed at other end.");
connection.close();
break;
}
messageIn = messageIn.substring(1);
}
TextIO.putln("RECEIVED: " + messageIn);
TextIO.put("SEND: ");
messageOut = TextIO.getln();
if (messageOut.equalsIgnoreCase("quit")) {
// User wants to quit. Inform the other side
// of the connection, then close the connection.
outgoing.println(CLOSE);
outgoing.flush(); // Make sure the data is sent!
connection.close();
TextIO.putln("Connection closed.");
break;
}
outgoing.println(MESSAGE + messageOut);
outgoing.flush(); // Make sure the data is sent!
if (outgoing.checkError()) {
throw new IOException("Error ocurred while reading incoming message.");
}
}
}
catch (Exception e) {
TextIO.putln("Sorry, an error has occurred. Connection lost.");
TextIO.putln(e.toString());
System.exit(1);
}
} // end main()
} //end class CLChatServer

59
java/Client Server Using RMI.java
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//AddInterface.java
import java.rmi.*;
public interface AddInterface extends Remote
{
public int sum(int n1, int n2) throws RemoteException
}
//Add.java
import java.rmi.*;
import java.rmi.server.*;
public class Add extends UnicastRemoteObject implements AddInterface
{
int num1, num2 ;
public Add() throws RemoteException
{
}
public int sum(int n1, int n2) throws RemoteException
{
num1=n1;
num2=n2;
return n1+n2;
}
}
//AddServer.java
import java.rmi.Naming;
public class AddServer
{
public static void main(String args[])
{
try
{
Naming.rebind("Add",new Add());
System.out.println("Server is connected and waiting for client");
}
catch(Exception e)
{
System.out.println("server could not connect:"+e);
}
}
}
//AddClient.java
import java.rmi.Naming;
public class AddClient
{
public static void main(String args[])
{
try
{
AddInterface ai=(AddInterface)Naming.lookup("//localhost/Add");
System.out.println("The sum of two nos. is :"+ai.sum(10,2));
}
catch(Exception e)
{
System.out.println("Client Exception:"+e);
}
}
}

36
java/Creating a Non-Blocking Socket.java
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Creating a Non-Blocking Socket
public class test
{
public static void main(String args[])
{
// Create a non-blocking socket and check for connections
try {
// Create a non-blocking socket channel on port 8080
SocketChannel sChannel = createSocketChannel("www.xxx", 8080);
// Before the socket is usable, the connection must be completed
// by calling finishConnect(), which is non-blocking
while (!sChannel.finishConnect()) {
// Do something else
System.out.println("wonderful");
}
// Socket channel is now ready to use
}
catch (IOException e) {
}
}
// Creates a non-blocking socket channel for the specified host name and port.
// connect() is called on the new channel before it is returned.
public static SocketChannel createSocketChannel(String hostName, int port) throws IOException
{
// Create a non-blocking socket channel
SocketChannel sChannel = SocketChannel.open();
sChannel.configureBlocking(false);
// Send a connection request to the server; this method is non-blocking
sChannel.connect(new InetSocketAddress(hostName, port));
return sChannel;
}
}

49
java/DateClient.java
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DateClient
import java.net.*;
import java.io.*;
public class DateClient {
static final int LISTENING_PORT = 32007;
public static void main(String[] args) {
String computer; // Name of the computer to connect to.
Socket connection; // A socket for communicating with
// that computer.
Reader incoming; // Stream for reading data from
// the connection.
/* Get computer name from command line. */
if (args.length > 0)
computer = args[0];
else {
// No computer name was given. Print a message and exit.
System.out.println("Usage: java DateClient <server>");
return;
}
/* Make the connection, then read and display a line of text. */
try {
connection = new Socket( computer, LISTENING_PORT );
incoming = new InputStreamReader( connection.getInputStream() );
while (true) {
int ch = incoming.read();
if (ch == -1 || ch == '
' || ch == '
')
break;
System.out.print( (char)ch );
}
System.out.println();
incoming.close();
}
catch (Exception e) {
TextIO.putln("Error: " + e);
}
} // end main()
} //end class DateClient

61
java/DateServer.java
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DateServer
import java.net.*;
import java.io.*;
import java.util.Date;
public class DateServe {
static final int LISTENING_PORT = 32007;
public static void main(String[] args) {
ServerSocket listener; // Listens for incoming connections.
Socket connection; // For communication with the
// connecting program.
/* Accept and process connections forever, or until
some error occurs. (Note that errors that occur
while communicating with a connected program are
caught and handled in the sendDate() routine, so
they will not crash the server.)
*/
try {
listener = new ServerSocket(LISTENING_PORT);
TextIO.putln("Listening on port " + LISTENING_PORT);
while (true) {
connection = listener.accept();
sendDate(connection);
}
}
catch (Exception e) {
TextIO.putln("Sorry, the server has shut down.");
TextIO.putln("Error: " + e);
return;
}
} // end main()
static void sendDate(Socket client) {
// The parameter, client, is a socket that is
// already connected to another program. Get
// an output stream for the connection, send the
// current date, and close the connection.
try {
System.out.println("Connection from " +
client.getInetAddress().toString() );
Date now = new Date(); // The current data and time.
PrintWriter outgoing; // Stream for sending data.
outgoing = new PrintWriter( client.getOutputStream() );
outgoing.println( now.toString() );
outgoing.flush(); // Make sure the data is actually sent!
client.close();
}
catch (Exception e){
System.out.println("Error: " + e);
}
} // end sendDate()
} //end class DateServe

66
java/FTPLogin.java
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FTPLogin
import java.io.BufferedReader;
import java.io.PrintWriter;
import java.io.InputStreamReader;
import java.net.Socket;
public class FTPLogin
{
public static void main (String args[])
{
Socket socket = null;
BufferedReader in = null;
PrintWriter out = null;
String line = null;
if (args.length != 3)
{
System.out.println ("USAGE: IP USER PASS");
}
else
{
try
{
socket = new Socket (args[0], 21);
in = new BufferedReader (new InputStreamReader(socket.getInputStream()));
out = new PrintWriter (socket.getOutputStream());
out.print("user "+ args[1] + "
");
out.print("pass "+ args[2] + "
");
out.print ("pwd
");
out.print ("quit
");
out.flush();
while ( (line = in.readLine()) != null)
{
System.out.println(line);
}
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
finally
{
try
{
out.close();
in.close();
socket.close();
}
catch (Exception fe)
{
System.out.println ("RESOURCE CLOSE EXCEPTION " +fe.getMessage());
}
}
} //end else
} //end main
} //end class

69
java/IPC Client Server Program.java
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// IPC CLient Program
import java.net.*;
import java.io.*;
public class IPCClient
{
public static void main(String args[])
{
try
{
Socket s=new Socket("localhost",3128);
DataOutputStream dos=new DataOutputStream(s.getOutputStream());
DataInputStream dis=new DataInputStream(s.getInputStream());
InputStreamReader isr=new InputStreamReader(System.in);
System.out.println("......Client PROCESS STARTED....");
System.out.println("Enter the value of 1 and 2 to pass the server process");
BufferedReader br=new BufferedReader(isr);
int a=Integer.parseInt(br.readLine());
System.out.println("\Number 1="+a);
dos.writeInt(+a);
int b=Integer.parseInt(br.readLine());
System.out.println("\Number 2="+b);
dos.writeInt(+b);
int result=dis.readInt();
System.out.println("Client Process has receieved result from server\n..");
s.close();
}
catch(Exception e)
{
System.out.println("Exception "+e);
}
}
}
//IPC Server
import java.net.*;
import java.io.*;
public class IPCServer
{
public static void main(String args[])
{
System.out.println("......INTERPROCESS COMMUNICATION....");
System.out.println("......SERVER PROCESS STARTED....");
System.out.println("......SERVER IS READY AND WAITING TO RECEIVE DATA FROM CLIENT FROM PORT...."+3128);
try
{
ServerSocket ss=new ServerSocket(3128);
Socket clientSocket=ss.accept();
System.out.println("Client is connected with IP Address"+clientSocket.getInetAddress()+"And Port no"+clientSocket.getPort());
DataOutputStream dos=new DataOutputStream(clientSocket.getOutputStream());
DataInputStream dis=new DataInputStream(clientSocket.getInputStream());
int a=dis.readInt();
System.out.println("Server recievd");
System.out.println("\Number 1="+a);
int b=dis.readInt();
System.out.println("\Number 2="+b);
int c=a+b;
dos.writeInt(c);
System.out.println("Server Process has executed..Requested process and sent result"+c+"To the Client\n");
clientSocket.close();
}
catch(Exception e)
{
System.out.println("Exception "+e);
}
}
}

92
java/Implement Apriori algorithm for association rule.java
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import java.io.*;
class apriori
{
public static void main(String []arg)throws IOException
{
int i,j,m=0;
int t1=0;
BufferedReader b=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter the number of transaction :");
int n=Integer.parseInt(b.readLine());
System.out.println("items :1--Milk 2--Bread 3--Coffee 4--Juice 5--Cookies 6--Jam");
int item[][]=new int[n][6];
for(i=0; i<n; i++)
for(j=0; j<6; j++)
item[i][j]=0;
String[] itemlist= {"MILK","BREAD","COFFEE","JUICE","COOKIES","JAM"};
int nt[]=new int[6];
int q[]=new int[6];
for(i=0; i<n; i++)
{
System.out.println("Transaction "+(i+1)+" :");
for(j=0; j<6; j++)
{
//System.out.println(itemlist[j]);
System.out.println("Is Item "+itemlist[j]+" present in this transaction(1/0)? :");
item[i][j]=Integer.parseInt(b.readLine());
}
}
for(j=0; j<6; j++)
{
for(i=0; i<n; i++)
{
if(item[i][j]==1)
nt[j]=nt[j]+1;
}
System.out.println("Number of Item "+itemlist[j]+" :"+nt[j]);
}
for(j=0; j<6; j++)
{
if(((nt[j]/(float)n)*100)>=50)
q[j]=1;
else
q[j]=0;
if(q[j]==1)
{
t1++;
System.out.println("Item "+itemlist[j]+" is selected ");
}
}
for(j=0; j<6; j++)
{
for(i=0; i<n; i++)
{
if(q[j]==0)
{
item[i][j]=0;
}
}
}
int nt1[][]=new int[6][6];
for(j=0; j<6; j++)
{
for(m=j+1; m<6; m++)
{
for(i=0; i<n; i++)
{
if(item[i][j]==1 &&item[i][m]==1)
{
nt1[j][m]=nt1[j][m]+1;
}
}
if(nt1[j][m]!=0)
System.out.println("Number of Items of "+itemlist[j]+"& "+itemlist[m]+" :"+nt1[j][m]);
}
}
for(j=0; j<6; j++)
{
for(m=j+1; m<6; m++)
{
if(((nt1[j][m]/(float)n)*100)>=50)
q[j]=1;
else
q[j]=0;
if(q[j]==1)
{
System.out.println("Item "+itemlist[j]+"& "+itemlist[m]+" is selected ");
}
}
}
}
}

187
java/Implementation of Agglomerative Algorithm.java
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package tutorial.clustering;
import de.lmu.ifi.dbs.elki.algorithm.AbstractDistanceBasedAlgorithm;
import de.lmu.ifi.dbs.elki.data.type.TypeInformation;
import de.lmu.ifi.dbs.elki.distance.distancefunction.DistanceFunction;
import de.lmu.ifi.dbs.elki.distance.distancevalue.NumberDistance;
import de.lmu.ifi.dbs.elki.logging.Logging;
import de.lmu.ifi.dbs.elki.result.Result;
public class NaiveAgglomerativeHierarchicalClustering<O, D extends NumberDistance<D, ?>>
extends AbstractDistanceBasedAlgorithm<O, D, Result>
{
protected NaiveAgglomerativeHierarchicalClustering(DistanceFunction<? super O, D> distanceFunction)
{
super(distanceFunction);
// TODO Auto-generated constructor stub
}
public TypeInformation[] getInputTypeRestriction()
{
// TODO Auto-generated method stub
return null;
}
protected Logging getLogger()
{
// TODO Auto-generated method stub
return null;
}
}
/**
* Static class logger.
*/
private static final Logging LOG = Logging.getLogger(NaiveAgglomerativeHierarchicalClustering.class);
protected Logging getLogger()
{
return LOG;
}
public TypeInformation[] getInputTypeRestriction()
{
return TypeUtil.array(
getDistanceFunction().getInputTypeRestriction()
);
}
// The run method
public Result run(Database db, Relation<O> relation)
{
return null;
}
DistanceQuery<O, D> dq = db.getDistanceQuery(relation, getDistanceFunction());
ArrayDBIDs ids = DBIDUtil.ensureArray(relation.getDBIDs());
final int size = ids.size();
LOG.verbose("Notice: SLINK is a much faster algorithm for single-linkage clustering!");
Computing the distance matrix
double[][] matrix = new double[size][size];
DBIDArrayIter ix = ids.iter(), iy = ids.iter();
for (int x = 0; ix.valid(); x++, ix.advance())
{
iy.seek(0);
for (int y = 0; y < x; y++, iy.advance())
{
final double dist = dq.distance(ix, iy).doubleValue();
matrix[x][y] = dist;
matrix[y][x] = dist;
}
}
Algorithm main loop
final int stop = size - numclusters;
FiniteProgress prog = LOG.isVerbose() ?
new FiniteProgress("Agglomerative clustering", stop, LOG)
: null;
for (int i = 0; i < stop; i++)
{
// TODO: find clusters to merge
// TODO: store the merge in auxillary data
// TODO: update distance matrix
if (prog != null)
{
prog.incrementProcessed(LOG);
}
}
if (prog != null)
{
prog.ensureCompleted(LOG);
}
double min = Double.POSITIVE_INFINITY;
int minx = -1, miny = -1;
for (int x = 0; x < size; x++)
{
if (height[x] < Double.POSITIVE_INFINITY)
{
continue;
}
for (int y = 0; y < x; y++)
{
if (height[y] < Double.POSITIVE_INFINITY)
{
continue;
}
if (matrix[x][y] < min)
{
min = matrix[x][y];
minx = x;
miny = y;
}
}
}
// Avoid allocating memory, by reusing existing iterators:
ix.seek(minx);
iy.seek(miny);
// Perform merge in data structure: x -> y
// Since y < x, prefer keeping y, dropping x.
height[minx] = min;
parent.set(minx, iy);
// Merge into cluster
ModifiableDBIDs cx = clusters.get(minx);
ModifiableDBIDs cy = clusters.get(miny);
if (cy == null)
{
cy = DBIDUtil.newHashSet();
cy.add(iy);
}
if (cx == null)
{
cy.add(ix);
}
else
{
cy.addDBIDs(cx);
clusters.remove(minx);
}
clusters.put(miny, cy);
// Update distance matrix for y:
for (int j = 0; j < size; j++)
{
matrix[j][miny] = Math.min(matrix[j][minx], matrix[j][miny]);
matrix[miny][j] = Math.min(matrix[minx][j], matrix[miny][j]);
}
Returning a Clustering
final Clustering<Model> dendrogram = new Clustering<>(
"Hierarchical-Clustering", "hierarchical-clustering");
for (int x = 0; x < size; x++)
{
if (height[x] < Double.POSITIVE_INFINITY)
{
continue;
}
DBIDs cids = clusters.get(x);
// For singleton objects, this may be null.
if (cids == null)
{
ix.seek(x);
cids = DBIDUtil.deref(ix);
}
Cluster<Model> cluster = new Cluster<>("Cluster", cids);
dendrogram.addToplevelCluster(cluster);
}
return dendrogram;
Updating the constructor
/**
* Threshold, how many clusters to extract.
*/
int numclusters;
public NaiveAgglomerativeHierarchicalClustering(
DistanceFunction<? super O, D> distanceFunction,
int numclusters)
{
super(distanceFunction);
this.numclusters = numclusters;
}
Adding a Parameterizer
public static class Parameterizer<O, D extends NumberDistance<D, ?>>
extends AbstractDistanceBasedAlgorithm.Parameterizer<O, D>
{
int numclusters = 0;
protected void makeOptions(Parameterization config)
{
super.makeOptions(config);
IntParameter numclustersP = new IntParameter(SLINK.Parameterizer.SLINK_MINCLUSTERS_ID);
numclustersP.addConstraint(new GreaterEqualConstraint(1));
if (config.grab(numclustersP))
{
numclusters = numclustersP.intValue();
}
}
protected NaiveAgglomerativeHierarchicalClustering<O, D> makeInstance()
{
return new NaiveAgglomerativeHierarchicalClustering<>(distanceFunction, numclusters);
}
}

138
java/Implementation of clustering algorithm K-means.java
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import java.util.*;
class k_means
{
static int count1,count2,count3;
static int d[];
static int k[][];
static int tempk[][];
static double m[];
static double diff[];
static int n,p;
static int cal_diff(int a) // This method will determine the cluster in which an element go at a particular step.
{
int temp1=0;
for(int i=0; i<p; ++i)
{
if(a>m[i])
diff[i]=a-m[i];
else
diff[i]=m[i]-a;
}
int val=0;
double temp=diff[0];
for(int i=0; i<p; ++i)
{
if(diff[i]<temp)
{
temp=diff[i];
val=i;
}
}//end of for loop
return val;
}
static void cal_mean() // This method will determine intermediate mean values
{
for(int i=0; i<p; ++i)
m[i]=0; // initializing means to 0
int cnt=0;
for(int i=0; i<p; ++i)
{
cnt=0;
for(int j=0; j<n-1; ++j)
{
if(k[i][j]!=-1)
{
m[i]+=k[i][j];
++cnt;
}
}
m[i]=m[i]/cnt;
}
}
static int check1() // This checks if previous k ie. tempk and current k are same.Used as terminating case.
{
for(int i=0; i<p; ++i)
for(int j=0; j<n; ++j)
if(tempk[i][j]!=k[i][j])
{
return 0;
}
return 1;
}
public static void main(String args[])
{
Scanner scr=new Scanner(System.in);
/* Accepting number of elements */
System.out.println("Enter the number of elements ");
n=scr.nextInt();
d=new int[n];
/* Accepting elements */
System.out.println("Enter "+n+" elements: ");
for(int i=0; i<n; ++i)
d[i]=scr.nextInt();
/* Accepting num of clusters */
System.out.println("Enter the number of clusters: ");
p=scr.nextInt();
/* Initialising arrays */
k=new int[p][n];
tempk=new int[p][n];
m=new double[p];
diff=new double[p];
/* Initializing m */
for(int i=0; i<p; ++i)
m[i]=d[i];
int temp=0;
int flag=0;
do
{
for(int i=0; i<p; ++i)
for(int j=0; j<n; ++j)
{
k[i][j]=-1;
}
for(int i=0; i<n; ++i) // for loop will cal cal_diff(int) for every element.
{
temp=cal_diff(d[i]);
if(temp==0)
k[temp][count1++]=d[i];
else if(temp==1)
k[temp][count2++]=d[i];
else if(temp==2)
k[temp][count3++]=d[i];
}
cal_mean(); // call to method which will calculate mean at this step.
flag=check1(); // check if terminating condition is satisfied.
if(flag!=1)
/*Take backup of k in tempk so that you can check for equivalence in next step*/
for(int i=0; i<p; ++i)
for(int j=0; j<n; ++j)
tempk[i][j]=k[i][j];
System.out.println("\n\nAt this step");
System.out.println("\nValue of clusters");
for(int i=0; i<p; ++i)
{
System.out.print("K"+(i+1)+"{ ");
for(int j=0; k[i][j]!=-1 && j<n-1; ++j)
System.out.print(k[i][j]+" ");
System.out.println("}");
}//end of for loop
System.out.println("\nValue of m ");
for(int i=0; i<p; ++i)
System.out.print("m"+(i+1)+"="+m[i]+" ");
count1=0;
count2=0;
count3=0;
}
while(flag==0);
System.out.println("\n\n\nThe Final Clusters By Kmeans are as follows: ");
for(int i=0; i<p; ++i)
{
System.out.print("K"+(i+1)+"{ ");
for(int j=0; k[i][j]!=-1 && j<n-1; ++j)
System.out.print(k[i][j]+" ");
System.out.println("}");
}
}
}

81
java/Interprocess communication.java
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import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
public class Squarer
{
private BlockingQueue<Integer> in;
private BlockingQueue<SquareResult> out;
Squarer(BlockingQueue<Integer> request, BlockingQueue<SquareResult> replies)
{
this.in = request;
this.out = replies;
}
public void start()
{
new Thread(new Runnable()
{
public void run()
{
while(true)
{
try
{
int x = in.take();
int y = x*x;
Thread.sleep(2000);
System.out.println("OK, got it. Calculating..");
Thread.sleep(4000);
out.put(new SquareResult(x,y));
}
catch(InterruptedException e)
{
System.out.println("interrupted yo");
}
}
}
}).start();
}
}
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
public class SquareKaro
{
public static void main(String[] args)
{
BlockingQueue<Integer> number = new LinkedBlockingQueue<>();
BlockingQueue<SquareResult> result = new LinkedBlockingQueue<>();
Squarer mysquarer = new Squarer(number, result);
mysquarer.start();
try
{
System.out.println("Hey another process, give me square of => 54");
number.put(54);
System.out.println(result.take());
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
public class SquareResult
{
private int input;
private int output;
public SquareResult(int in, int out)
{
this.input = in;
this.output = out;
}
@Override public String toString()
{
return input +" ka square hai "+output;
}
}

54
java/LoadBalancer.java
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import java.util.Scanner;
class LoadBalancer
{
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
System.out.print("Enter the number of servers:");
int servers=sc.nextInt();
System.out.println();
System.out.print("Enter the number of processes:");
int Processes=sc.nextInt();
while(true)
{
printLoad(servers,Processes);
System.out.println("1.Add Servers 2.Remote Servers 3.Add Processes 4.Remove Processes 5.Exit :");
switch(sc.nextInt())
{
case 1:
System.out.print("How many more servers?:");
servers+=sc.nextInt();
break;
case 2:
System.out.print("How many servers to remove?:");
servers-=sc.nextInt();
break;
case 3:
System.out.print("How many more Processes?:");
Processes+=sc.nextInt();
break;
case 4:
System.out.print("How many Processes to remove?:");
Processes-=sc.nextInt();
break;
case 5:
return;
}
}
}
static void printLoad(int servers,int Processes)
{
int each=Processes/servers;
int extra=Processes%servers;
int total=0;
for(int i=0; i<servers; i++)
{
if(extra-->0)total=each+1;
else total=each;
System.out.println("Server "+(char)('A'+i)+" has "+total+" Processes");
}
}
}

83
java/Multi ClassLoader Demo.java
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Multi ClassLoader Demo
import java.net.URLClassLoader;
import java.net.URL;
import java.io.File;
public class MultiCLDemo
{
public static void main(String[] args)
{
if (args.length<3)
{
System.out.println("Usage: java MultiCLDemo "+" ...");
System.out.println("Loads and runs toString() on class_name "+"found in each subDir.");
System.exit(0);
}
try
{
String className = args[0];
int count = args.length-1;
URL tmpURL;
Object[] objects = new Object[count];
URLClassLoader[] loaders = new URLClassLoader[count];
System.out.println("Loading "+count+" different classes "+"named: "+className);
for (int i=0; i {
tmpURL = new File(args[i+1]).toURL();
System.out.println("\nLoading from: "+tmpURL);
loaders[i] = new URLClassLoader(new URL[] { tmpURL });
objects[i] = loaders[i].loadClass(className).newInstance();
for (int k=0; k<=i; k++)
{
System.out.println("Got object: "+objects[k]);
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
/*Some sample classes to load...
// c:\a/HelloWorld.java
public class HelloWorld
{
public String toString()
{
return "Hello";
}
}
// c:\b/HelloWorld.java
public class HelloWorld
{
public String toString()
{
return "World";
}
}
// c:\c/HelloWorld.java
public class HelloWorld
{
public String toString()
{
return "Hello World";
}
}
The code running...
java MultiCLDemo HelloWorld a b c
Loading 3 different classes named:
HelloWorldLoading from: file:/.../class_loader_demo/a/Got object:
HelloLoading from: file:/.../class_loader_demo/b/Got object:
HelloGot object: WorldLoading from: file:/.../class_loader_demo/c/Got object:
HelloGot object: WorldGot object: Hello World
regards, btcoburn*/

108
java/Mutual Exclusion Algorithm.java
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// EchoServer.java
import java.io.*;
import java.net.*;
public class EchoServer implements Runnable
{
Socket socket=null;
static ServerSocket ss;
EchoServer(Socket newSocket)
{
this.socket=newSocket;
}
public static void main(String args[]) throws IOException
{
ss=new ServerSocket(7000);
System.out.println("Server Started");
while(true)
{
Socket s = ss.accept();
EchoServer es = new EchoServer(s);
Thread t = new Thread(es);
t.start();
}
}
public void run()
{
try
{
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while(true)
{
System.out.println(in.readLine());
}
}
catch(Exception e)
{}
}
}
// EchoClientOne.java
import java.io.*;
import java.net.*;
public class EchoClientOne
{
public static void main(String args[])throws IOException
{
Socket s=new Socket("localhost",7000);
PrintStream out = new PrintStream(s.getOutputStream());
ServerSocket ss = new ServerSocket(7001);
Socket s1 = ss.accept();
BufferedReader in1 = new BufferedReader(new InputStreamReader(s1.getInputStream()));
PrintStream out1 = new PrintStream(s1.getOutputStream());
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str="Token";
while(true)
{
if(str.equalsIgnoreCase("Token"))
{
System.out.println("Do you want to send some data");
System.out.println("Enter Yes or No");
str=br.readLine();
if(str.equalsIgnoreCase("Yes"))
{
System.out.println("Enter the data");
str=br.readLine();
out.println(str);
}
out1.println("Token");
}
System.out.println("Waiting for Token");
str=in1.readLine();
}
}
}
// EchoClientTwo.java
import java.io.*;
import java.net.*;
public class EchoClientTwo
{
public static void main(String args[])throws IOException
{
Socket s=new Socket("localhost",7000);
PrintStream out = new PrintStream(s.getOutputStream());
Socket s2=new Socket("localhost",7001);
BufferedReader in2 = new BufferedReader(new InputStreamReader(s2.getInputStream()));
PrintStream out2 = new PrintStream(s2.getOutputStream());
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str;
while(true)
{
System.out.println("Waiting for Token");
str=in2.readLine();
if(str.equalsIgnoreCase("Token"))
{
System.out.println("Do you want to send some data");
System.out.println("Enter Yes or No");
str=br.readLine();
if(str.equalsIgnoreCase("Yes"))
{
System.out.println("Enter the data");
str=br.readLine();
out.println(str);
}
out2.println("Token");
}
}
}
}

47
java/MyThread.java
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import java.util.*;
class MyThread implements Runnable
{
private Thread t;
private String ThreadName;
MyThread(String name)
{
ThreadName = name;
}
public void run()
{
System.out.println(ThreadName+" is starting..");
try
{
Thread.sleep(500);
}
catch (InterruptedException e)
{
System.out.println(ThreadName+"interrupted");
}
System.out.println(ThreadName+" is stopping..");
}
public void start()
{
if(t == null)
{
t = new Thread(this, ThreadName);
t.start();
}
}
}
class Test
{
public static void main(String[] args)
{
MyThread m1 = new MyThread("yo dudes");
m1.start();
MyThread m2 = new MyThread("yo buddies again");
m2.start();
}
}

29
java/Parallel Algorithms.java
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import java.util.*;
public class ParallelSort
{
public static void main(String[] args)
{
// Create a list and populate it with random numbers
List<Integer> list = new ArrayList();
Random r = new Random();
for (int x = 0; x < 30000000; x++)
{
list.add(r.nextInt(10000));
}
// Create two arrays for sorting.
Integer[] array1 = new Integer[list.size()];
Integer[] array2 = new Integer[list.size()];
array1 = list.toArray(array1);
array2 = list.toArray(array2);
// sort array
long start = System.currentTimeMillis();
Arrays.sort(array1);
long end = System.currentTimeMillis();
System.out.println("Sort Time: " + (end - start));
// sort array using parallel sort
start = System.currentTimeMillis();
Arrays.parallelSort(array2);
end = System.currentTimeMillis();
System.out.println("Parallel Sort Time: " + (end - start));
}

23
java/Ping a server.java
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Ping a server
import java.io.*;
import java.net.*;
public class PseudoPing {
public static void main(String args[]) {
try {
Socket t = new Socket(args[0], 7);
DataInputStream dis = new DataInputStream(t.getInputStream());
PrintStream ps = new PrintStream(t.getOutputStream());
ps.println("Hello");
String str = is.readLine();
if (str.equals("Hello"))
System.out.println("Alive!") ;
else
System.out.println("Dead or echo port not responding");
t.close();
}
catch (IOException e) {
e.printStackTrace();}
}
}

46
java/Port Scanner.java
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Port Scanner
import java.net.*;
import java.io.IOException;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class PScanner {
public static void main(String[] args) {
InetAddress ia=null;
String host=null;
try {
host=JOptionPane.showInputDialog("Enter the Host name to scan:\n example: xxx.com");
if(host!=null){
ia = InetAddress.getByName(host);
scan(ia); }
}
catch (UnknownHostException e) {
System.err.println(e );
}
System.out.println("Bye from NFS");
//System.exit(0);
}
public static void scan(final InetAddress remote) {
//variables for menu bar
int port=0;
String hostname = remote.getHostName();
for ( port = 0; port < 65536; port++) {
try {
Socket s = new Socket(remote,port);
System.out.println("Server is listening on port " + port+ " of " + hostname);
s.close();
}
catch (IOException ex) {
// The remote host is not listening on this port
System.out.println("Server is not listening on port " + port+ " of " + hostname);
}
}//for ends
}
}

50
java/SimpleApacheSoapClient.java
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SimpleApacheSoapClient
package com.ack.webservices.soap;
import java.net.URL;
import java.util.Vector;
import org.apache.soap.Constants;
import org.apache.soap.rpc.Call;
import org.apache.soap.rpc.Parameter;
import org.apache.soap.rpc.Response;
public class SimpleApacheSoapClient {
public static void main( String[] args ) throws Exception {
// soap service endpoint
//URL url = new URL("http://services.xmethods.com:80/soap/servlet/rpcrouter");
URL url = new URL( "http://localhost:6666/soap/servlet/rpcrouter" );
// create a call
Call call = new Call();
// Service uses standard SOAP encoding
call.setEncodingStyleURI( Constants.NS_URI_SOAP_ENC );
// Set service locator parameters
call.setTargetObjectURI( "urn:xmethods-Temperature" );
call.setMethodName( "getTemp" );
// Create input parameter vector
Vector params = new Vector();
params.addElement( new Parameter( "zipcode", String.class, "94041", null ) );
call.setParams( params );
// Invoke the service, note that an empty SOAPActionURI of
// "" indicates that intent of the SOAP request is taken to
// be the request URI
Response resp = call.invoke( url, "" );
// ... and evaluate the response
if( resp.generatedFault() ) {
throw new Exception();
}
else {
// Call was successful. Extract response parameter and return result
Parameter result = resp.getReturnValue();
System.out.println( "temperature is -> " + result.getValue() );
}
}
}

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java/SquareKaro.java
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import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
public class SquareKaro
{
public static void main(String[] args)
{
BlockingQueue<Integer> number = new LinkedBlockingQueue<>();
BlockingQueue<SquareResult> result = new LinkedBlockingQueue<>();
Squarer mysquarer = new Squarer(number, result);
mysquarer.start();
try
{
System.out.println("Hey another process, give me square of => 54");
number.put(54);
System.out.println(result.take());
}
catch(Exception e)
{
e.printStackTrace();
}
}
}

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java/SquareResult.java
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public class SquareResult
{
private int input;
private int output;
public SquareResult(int in, int out)
{
this.input = in;
this.output = out;
}
@Override public String toString()
{
return input +" ka square hai "+output;
}
}

44
java/Squarer.java
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import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
public class Squarer
{
private BlockingQueue<Integer> in;
private BlockingQueue<SquareResult> out;
Squarer(BlockingQueue<Integer> request, BlockingQueue<SquareResult> replies)
{
this.in = request;
this.out = replies;
}
public void start()
{
new Thread(new Runnable()
{
public void run()
{
while(true)
{
try
{
int x = in.take();
int y = x*x;
Thread.sleep(2000);
System.out.println("OK, got it. Calculating..");
Thread.sleep(4000);
out.put(new SquareResult(x,y));
}
catch(InterruptedException e)
{
System.out.println("interrupted yo");
}
}
}
}).start();
}
}

154
java/To implement Na‹ve Bayesian Classifier.java
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import java.util.*;
class btheo
{
static char outlook[]= {'S','S','O','R','R','R','O','S','S','R','S','O','O','R'};
static char temperature[]= {'H','H','H','M','C','C','C','M','C','M','M','M','H','M'};
static char humidity[]= {'P','P','P','P','N','N','N','P','N','N','N','P','N','P'};
static char windy[]= {'F','T','F','F','F','T','T','F','F','F','T','T','F','T'};
static char class1[]= {'N','N','P','P','P','N','P','N','P','P','P','P','P','N'};
static double prob[][]=new double[4][2];
static double pp=9.0/14.0;
static double npp=5.0/14.0;
static int flag=0;
static int flag1=0;
static double play_N=1;
static double notplay_N=1;
static void cal_N(int a)
{
if(a==1)
{
for(int i=0; i<4; ++i)
play_N*=prob[i][0];
play_N*=pp;
//System.out.println("\nValue of N of play \n"+play_N);
}
Else
{
for(int i=0; i<4; ++i)
notplay_N*=prob[i][1
notplay_N*=npp;
//System.out.println("\nValue of N of No play \n"+notplay_N);
}
}
static double cal_play_prob(char ch)
{
double prob=0;
double count=0;
if(flag==0)
{
for(int i=0; i<14; ++i)
if(outlook[i]==ch && class1[i]=='P')
++count;
prob=count/9.0;
flag=1;
}
else if
(flag==1)
{
for(int i=0; i<14; ++i)
if(temperature[i]==ch && class1[i]=='P')
++count;
prob=count/9.0;
flag=2;
}
else if
(flag==2)
{
for(int i=0; i<14; ++i)
if(humidity[i]==ch && class1[i]=='P')
++count;
prob=count/9.0;
flag=3;
}
else if(flag==3)
{
for(int i=0; i<14; ++i)
if(windy[i]==ch && class1[i]=='P')
++count;
prob=count/9.0;
}
return prob;
}
static double cal_noplay_prob(char ch)
{
double prob=0;
double count=0;
if(flag1==0)
{
for(int i=0; i<14; ++i)
if(outlook[i]==ch && class1[i]=='N')
++count;
prob=count/5.0;
flag1=1;
}
else if(flag1==1)
{
for(int i=0; i<14; ++i)
if(temperature[i]==ch && class1[i]=='N')
++count;
prob=count/5.0;
flag1=2;
}
else if(flag1==2)
{
for(int i=0; i<14; ++i)
if(humidity[i]==ch && class1[i]=='N')
++count;
prob=count/5.0;
flag1=3;
}
else if(flag1==3)
{
for(int i=0; i<14; ++i)
if(windy[i]==ch && class1[i]=='N')
++count;
prob=count/5.0;
}
return prob;
}
public static void main(String args[])
{
Scanner scr=new Scanner(System.in);
System.out.println("Table\n");
System.out.println("Outlook\t Temperature\t Humidity\t Windy \tClass");
for(int i=0; i<14; ++i)
{
System.out.print(outlook[i]+"\t\t"+temperature[i]+"\t\t"+humidity[i]+"\t\t"+windy[i]+"\t\t"+class1[i]);
System.out.println();
}
System.out.println("Menu:\nOutlook: Sunny=S Overcast=O Rain=R\tTemperature: Hot=H Mild=M Cool=C\n");
System.out.println("Humidity: Peak=P Normal=N\t\tWindy: True=T False=F\n\nYour input should belong to one of these classes.\n");
System.out.println("class1: Play=P class2:Not Play=NP");
System.out.println("\nEnter your input: example. t={rain,hot,peak,false} input will be R,H,P,F");
String s=scr.nextLine();
char ch;
int count=0;
for(int i=0; i<8; i+=2)
{
ch=s.charAt(i);
prob[count][0]=cal_play_prob(ch);
prob[count][1]=cal_noplay_prob(ch);
++count;
}
cal_N(1);
cal_N(2);
double pt=play_N+notplay_N;
double prob_of_play=0;
double prob_of_noplay=0;
prob_of_play=play_N/pt;
prob_of_noplay=notplay_N/pt;
System.out.println("\nProbability of play "+prob_of_play);
System.out.println("\nProbability of NO play "+prob_of_noplay );
if(prob_of_play>prob_of_noplay)
System.out.println("\nThe new tuple classified under \"PLAY\" category.Hence there will be play!!!");
else
System.out.println("\nThe new tuple classified under \"NO PLAY\" category.Hence there will be NO play.");
}
}
}

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java/Using Proxy.java
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Using Proxy
import java.net.URL;
import java.net.URLConnection;
import java.net.HttpURLConnection;
import java.io.InputStream;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class ProxyDemo
{
// Set to true if you want to see verbose output.
private final static boolean bDebug = false;
/**
* This function makes an HTTP GET request of the specified URL using a proxy if provided.
* If successfully, the HTTP response headers are printed out.
* If the MIME type of the response is text/html, then the number of lines of text
* is printed as well.
*
* @param strURL - A string representing the URL to request, eg, "http://bdn.borland.com/"
* @param strProxy - A string representing either the IP address or host name of the proxy server.
* @param iProxyPort - An integer that indicates the proxy port or -1 to indicate the default port for the protocol.
* @return rc is true if the request succeeded and false otherwise.
*/
static boolean doURLRequest(String strURL, String strProxy, int iProxyPort)
{
boolean rc = false;
URL url = null;
URLConnection c = null;
try
{
System.out.println("\nHTTP Request: " + strURL);
URL urlOriginal = new URL(strURL);
if ((null != strProxy) && (0 < strProxy.length()))
{
URL urlProxy = new URL(urlOriginal.getProtocol(),
strProxy,
iProxyPort,// A value of -1 means use the default port for the specified protocol.
strURL);// The original URL is passed as "the file on the host".
System.out.println("Using Proxy: " + strProxy);
if (-1 != iProxyPort)
{
System.out.println("Using Proxy Port: " + iProxyPort);
}
url = urlProxy;
}
else
{
url = urlOriginal;
}
c = url.openConnection();
// In this example, we only consider HTTP connections.
if (c instanceof HttpURLConnection)// instanceof returns true only if the object is not null.
{
HttpURLConnection h = (HttpURLConnection) c;
h.connect();
String strStatus = h.getResponseMessage() + " (" + h.getResponseCode() + ")";
System.out.println("HTTP Status: " + strStatus);
System.out.println("HTTP Response Headers: ");
// Evidently, index 0 always returns null, so we start with index 1.
for (int i = 1; ; i++)
{
String strKey = h.getHeaderFieldKey(i);
if (null == strKey)
{
break;
}
System.out.println(i + ": " + strKey + ": " + h.getHeaderField(i));
}
// Normally at this point, one would download data from the connection.
// For example, if the MIME type is html, then download the string and display it.
String strContentType = h.getContentType();
if ((null != strContentType) && (0 == strContentType.compareTo("text/html")))
{
// Set boolean bDebug to true if you want verbose output.
// For simplicity's sake, we just count the number of lines of text.
if (bDebug) System.out.println("Received text/html:[");
int iNumLines = 0;
try
{
InputStream in = h.getInputStream();
BufferedReader data = new BufferedReader(new InputStreamReader(in));
String line = null;
while((line = data.readLine()) != null)
{
if (bDebug) System.out.println(line);
iNumLines++;
}
}
catch(Exception exc2)
{
System.out.println("**** IO failure: " + exc2.toString());
}
finally
{
if (bDebug) System.out.println("]");
System.out.println("Received text/html has " + iNumLines + " lines");
}
}
h.disconnect();
}
else
{
System.out.println("**** No download: connection was not HTTP");
}
rc = true;
}
// Catch all exceptions.
catch(Exception exc)
{
System.out.println("**** Connection failure: " + exc.toString());
// System.out.println("**** Connection failure: " + exc.getMessage());// Same as above line but without the exception class name.
}
finally
{
// Do cleanup here.
// For example, the following, in theory, could make garbage collection more efficient.
// This might be the place where you choose to put your method call to your connection's "disconnect()";
// curiously, while every URLConnection has a connect() method, they don't necessarily have a disconnect() method.
// HttpURLConnection has a disconnect() which is called above.
c = null;
url = null;
return rc;
}
}
public static void main(String[] args)
{
// Simple request, not using a proxy server.
ProxyDemo.doURLRequest("http://www.borland.com/", null, -1);
ProxyDemo.doURLRequest("http://www.borland.com", null, -1);
// Request, using a proxy server.
/**
* @todo: Note that the proxy indicated below will fail. Change to a valid server.
* (If you do not have a proxy server available, then search for a web site that
* lists public HTTP proxy servers.
* I hesitate to list any here as I'm not sure about the "legitimacy" of all these sites.)
*/
// *** If you don't change the proxy setting to something valid in the following,
// then you will get the following error message:
// **** Connection failure: java.net.BindException: Cannot assign requested address: connect
ProxyDemo.doURLRequest("http://www.borland.com/", "0.0.0.0", -1); // **** Change this line to use a valid proxy.
}
}
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