Java Socket getKeepAlive() method

The getKeepAlive() method of Java Socket class tests whether SO_KEEPALIVE option is enabled or not.

Syntax

Parameter

Return

The getKeepAlive() method either returns a Boolean indicating whether SO_KEEPALIVE option is enabled or not.

Throws

SocketException - if there is an error in the underlying protocol, such as a TCP error.

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketGetKeepAliveExample1  {
    public static void main(String[] args) throws IOException {
      Socket socket = new Socket();
      //enabling the boolean value true
      boolean on=true;
      //setKeepAlive() method either enables or disables the SO_KEEPALIVE option
      socket.setKeepAlive(on);
      //getKeepAlive() returns  a boolean indicating whether SO_KEEPALIVE option is enabled or not
      System.out.println("SO_KEEPALIVE is enabled: "+socket.getKeepAlive());
    }
}

Test it Now

Output:

SO_KEEPALIVE is enabled: true

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketGetKeepAliveExample2  {
    public static void main(String[] args) throws IOException {
      Socket socket = new Socket();
      //getKeepAlive() returns  a boolean indicating whether SO_KEEPALIVE option is enabled or not
      //by default the getKeepAlive value returns false
      System.out.println("SO_KEEPALIVE is enabled: "+socket.getKeepAlive());
    }
}

Test it Now

Output:

SO_KEEPALIVE is enabled: false

Example 3

import java.io.IOException;
import java.net.*;
public class JavaSocketGetKeepAliveExample3  {
    public static void main(String[] args) throws IOException {
      Socket socket = new Socket();
      //closing the socket
      socket.close();
      //getKeepAlive() returns  a boolean indicating whether SO_KEEPALIVE option is enabled or not
      //it will return an exception, as the socket is already closed
      System.out.println("SO_KEEPALIVE is enabled: "+socket.getKeepAlive());
    }
}

Test it Now

Output:

Exception in thread "main" java.net.SocketException: Socket is closed
	at java.net.Socket.getKeepAlive(Socket.java:1325)
	at com.javaTpoint.JavaSocketGetKeepAliveExample3.main(JavaSocketGetKeepAliveExample3.java:11)

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