Java ServerSocket setReuseAddress() method

The setReuseAddress() method of Java ServerSocket class either enables or disables the SO_REUSEADDR socket option.

Syntax

Parameter

The 'on' parameter states whether to enable or disable the socket option.

Return

Throws

SocketException- if an error occurs enabling or disabling the SO_REUSEADDRsocket option, or the socket is closed

Example 1

importjava.io.IOException;
import java.net.ServerSocket;
public class JavaServerSocketSetReuseAddressExample1 {
public static void main(String[] args) throws IOException {
ServerSocketserverSocket = new ServerSocket();
//setting the boolean value true
booleanon=true;
//setReuseAddress() method enables or disables the SO_REUSEADDR socket option.
serverSocket.setReuseAddress(on);
//getReuseAddress() method returns a boolean 'true' if the SO_REUSEADDR option is enabled
System.out.println("SO_REUSEADDR is enabled: "+serverSocket.getReuseAddress());
    }
}

Output:

SO_REUSEADDR is enabled: true

Example 2

import java.io.IOException;
import java.net.ServerSocket;
public class JavaServerSocketSetReuseAddressExample2  {
public static void main(String[] args) throws IOException {
ServerSocketserverSocket = new ServerSocket();
//setting the boolean value true
serverSocket.close();
booleanon=false;
//setReuseAddress() method enables or disables the SO_REUSEADDR socket option.
serverSocket.setReuseAddress(on);
//getReuseAddress() method returns a boolean 'true' if the SO_REUSEADDR option is enabled
System.out.println("SO_REUSEADDR is enabled: "+serverSocket.getReuseAddress());
    }
}

Output:

Exception in thread "main" java.net.SocketException: Socket is closed
	atjava.net.ServerSocket.setReuseAddress(ServerSocket.java:713)
	at com.javaTpoint.JavaServerSocketSetReuseAddressExample2.main(JavaServerSocketSetReuseAddressExample2.java:14)

Example 3

import java.io.IOException;
import java.net.ServerSocket;
public class JavaServerSocketSetReuseAddressExample3  {
public static void main(String[] args) throws IOException {
ServerSocketserverSocket = new ServerSocket();
//setting the boolean value true
booleanon=false;
//setReuseAddress() method enables or disables the SO_REUSEADDR socket option.
        //it will throw an exception as the socket is already closed
serverSocket.setReuseAddress(on);
//getReuseAddress() method returns a boolean 'true' if the SO_REUSEADDR option is enabled
System.out.println("SO_REUSEADDR is enabled: "+serverSocket.getReuseAddress());
    }
}

Output: