Java Socket isBound() method

Last Updated : 17 Mar 2025

The isBound () method of Java Socket class returns a Boolean value representing the binding state of the socket. This method would continue to return 'true' for a closed socket, if it was bound before being closed.

Syntax

Parameter

Return

The isBound () method would return a Boolean value 'true' if the socket was successfully bound to an address.

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketIsBoundExample1  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        InetAddress inetAddress=InetAddress.getByName("localhost");
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the socket with inetAddress and port
        socket.bind(socketAddress);
        //the connection will not establish without binding the socket with bind() method
        socket.connect(socketAddress);
        //isBound() method returns a boolean value if the socket is bounded
        System.out.println("The Socket is bounded: "+socket.isBound());
    }
}

Output:

The Socket is bounded: true

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketIsBoundExample2  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //isBound() method returns a boolean value if the socket is bounded
        //by default the isBound() method returns false
        System.out.println("The Socket is bounded: "+socket.isBound());
    }
}

Output:

The Socket is bounded:  false

Example 3

import java.io.IOException;
import java.net.*;
public class JavaSocketIsBoundExample3  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        InetAddress inetAddress=InetAddress.getByName("localhost");
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the socket with inetAddress and port
        socket.bind(socketAddress);
        //the connection will not establish without binding the socket with bind() method
        socket.connect(socketAddress);
        //closing the socket
        socket.close();
        //The isBound() will continue to return the boolean value 'true' that was prior before closing the socket
        System.out.println("The Socket is bounded: "+socket.isBound());
    }
}

Output:

The Socket is bounded:  true

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Java Socket isBound() method

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Java Socket isBound() method

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Example 3

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