programming-examples/java/Numerical_Problems/java program to check whether a port is being used or not.java

    import java.net.*;
    import java.io.*;
    public class Main {
    	public static void main(String[] args) {
    		Socket Skt;
    		String host = "localhost";
    		if (args.length gt;0) {
    			host = args[0];
    		}
    		for (int i = 0; i < 1024; i++) {
    			try {
    			     System.out.println("Looking for "+ i);
    		             Skt = new Socket(host, i);
    			     System.out.println("There is a server on port "+ i + " of " + host);
    			}
    			catch (UnknownHostException e) {
    				System.out.println("Exception occured"+ e);
    				break;
    			}
    			catch (IOException e) {
    			}
    		}
    	}
    }