Java Socket isConnected() method

The isConnected () method of Java Socket class returns the connection state of the socket. This method would continue to return the connection state which was there before being closed.

Syntax

Parameter

Return

The isConnected () method would return a Boolean value 'true' if the socket has been successfully connected to a server.

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketIsConnectedExample1  {
    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);
        //isConnected() method returns the connected state of the socket
        System.out.println("The socket is connected: "+socket.isConnected());
        //isBound() method returns the binding state of the socket
        System.out.println("The socket is bounded: "+socket.isBound());
    }
}

Test it Now

Output:

The socket is connected: true
The socket is bounded: true

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketIsConnectedExample2  {
    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);
        //socket is closed
        socket.close();
        //isConnected() method returns the connected state of the socket
        //It will continue to return the connection state that was prior to being closed.
        System.out.println("The Socket is connected: "+socket.isConnected());
        //isBound() method returns the binding state of the socket
        System.out.println("The socket is bounded: "+socket.isBound());
    }
}

Test it Now

Output:

The Socket is connected: true
The socket is bounded: true

Next TopicJava Socket Class

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