Java Socket getPort() method

The getPort() method of Java Socket class returns the remote port number to which the socket is connected. This method will return the port number even after the socket is closed.

Syntax

Parameter

Return

The getPort() method either returns the port number to which the specified socket is connected or returns 0 if the socket is not connected.

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketGetPortExample1  {
    public static void main(String[] args) throws IOException {
        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 the inetAddress and port number
        //without binding the socket the connection can not be established
        socket.bind(socketAddress);
        socket.connect(socketAddress);
        //getPort() method will return the port number of this socket
        System.out.println("Port number: "+socket.getPort());
    }
}

Test it Now

Output:

Port number: 1085

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketGetPortExample2  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        //getPort() method will return the port number of this socket
        //if the socket is not binded, then 0 is returned as a default port number
        System.out.println("Port number: "+socket.getPort());
    }
}

Test it Now

Output:

Port number: 0

Example 3

import java.io.IOException;
import java.net.*;
public class JavaSocketGetPortExample3  {
    public static void main(String[] args) throws IOException {
        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 the inetAddress and port number
        socket.bind(socketAddress);
        //getPort() method will return the port number of this socket
        System.out.println("Port number: "+socket.getPort());
    }
}

Test it Now

Output:

Exception in thread "main" java.lang.IllegalArgumentException: port out of range:-1085
	at java.net.InetSocketAddress.checkPort(InetSocketAddress.java:143)
	at java.net.InetSocketAddress.(InetSocketAddress.java:188)
	at com.javaTpoint.JavaSocketGetPortExample3.main(JavaSocketGetPortExample3.java:12)

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