105 lines
3.4 KiB
Java
105 lines
3.4 KiB
Java
import java.io.*;
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import java.util.*;
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class BinSearch
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{
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private int size;
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private int[] a;
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private int index;
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public int n=0;
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//-----------------------------------------------------------------------------------------
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// constructor defined
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//-----------------------------------------------------------------------------------------
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public BinSearch(int Max)
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{
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size=Max;
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a=new int[size];
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index=0;
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}
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//-----------------------------------------------------------------------------------------
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// inserting an element in the array
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//-----------------------------------------------------------------------------------------
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public void insert(int val)
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{
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try
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{
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a[index++]=val;
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n=index;
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}
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catch(Exception e)
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{
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System.out.println("e.getMessage");
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}
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}
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//-----------------------------------------------------------------------------------------
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// Searching the element by Binary search
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// method
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//----------------------------------------------------------------------------------------
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public void Search(int low,int high,int key)
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{
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int mid;
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if(low>high)
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{
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System.out.println(" Error! It is not present in the list");
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return;
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}
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mid=(low+high)/2;
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if(key==a[mid])
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System.out.println("\nThe element is present at location "+(mid+1));
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else if(key<a[mid])
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Search(low,mid-1,key);
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else if(key>a[mid])
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Search(mid+1,high,key);
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}
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//----------------------------------------------------------------------------------------
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// Displaying the elements of an array
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//----------------------------------------------------------------------------------------
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public void display()
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{
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System.out.println("\n The elements are");
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for(int i=0; i<n; i++)
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System.out.println(" "+a[i]);
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}
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} // end class
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class BinSearchDemo
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{
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public static void main(String[] args)throws IOException
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{
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BinSearch obj = new BinSearch(10);
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System.out.println("\n Inserting items in the array");
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obj.insert(10);
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obj.insert(20);
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obj.insert(30);
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obj.insert(40);
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obj.insert(50);
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obj.insert(60);
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obj.insert(70);
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obj.display();
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System.out.println("\n Enter the elements to be searched");
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int key=getInt();
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int low=0;
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int high=obj.n;
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obj.Search(low,high,key);
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} // end main()
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//////////////////////////////////////////////////////////////////////////////
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//Following functions are used to handle the inputs entered
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//by the user using keyboard
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//////////////////////////////////////////////////////////////////////////////
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public static String getString() throws IOException
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{
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InputStreamReader input=new InputStreamReader(System.in);
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BufferedReader b=new BufferedReader(input);
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String str=b.readLine();//reading the string from console
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return str;
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}
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public static int getInt() throws IOException
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{
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String str=getString();
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return Integer.parseInt(str);//converting console string //to numeric value
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}
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}//end of class
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