Java Socket setReuseAddress () method

The setReuseAddress () method of Java Socket class enables or disables the SO_REUSEADDR socket option. The initial setting of SO_REUSEADDR is disabled.

Syntax

Parameter

The parameter 'on' states whether the SO_REUSEADDR option should be enabled or disabled.

Return

Throws

SocketException - if the socket is closed or an error occurs while enabling or disabling the SO_REUSEADDR socket option.

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketSetReuseAddressExample1  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //enabling the SO_REUSEADDR option
        Boolean on=true;
        //setReuseAddress() method enables or disables the SO_REUSEADDR option
        socket.setReuseAddress(on);
        //getReuseAddress() method returns boolean value 'true' if SO_REUSEADDR option is enabled else it return false
        System.out.println("SO_REUSEADDR option is enabled: "+socket.getReuseAddress());
    }
}

Test it Now

Output:

SO_REUSEADDR option is enabled: true

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketSetReuseAddressExample2  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //enabling the SO_REUSEADDR option
        Boolean on=false;
        //setReuseAddress() method enables or disables the SO_REUSEADDR option
        socket.setReuseAddress(on);
        //getReuseAddress() method returns boolean value 'true' if SO_REUSEADDR option is enabled else it return false
        if(socket.getReuseAddress()){
            System.out.println("SO_REUSEADDR option is enabled");
        }
        else{
            System.out.println("SO_REUSEADDR option is disabled");
        }
    }
}

Test it Now

Output:

SO_REUSEADDR option is disabled

Example 3

import java.io.IOException;
import java.net.*;
public class JavaSocketSetReuseAddressExample3  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //closing the socket
        socket.close();
        //enabling the SO_REUSEADDR option
        Boolean on=false;
        //setReuseAddress() method enables or disables the SO_REUSEADDR option
        //it will throw an exception, as the socket is already closed
        socket.setReuseAddress(on);
        //getReuseAddress() method returns boolean value 'true' if SO_REUSEADDR option is enabled else it return false
        if(socket.getReuseAddress()){
            System.out.println("SO_REUSEADDR option is enabled");
        }
        else{
            System.out.println("SO_REUSEADDR option is disabled");
        }
    }
}

Test it Now

Output:

Exception in thread "main" java.net.SocketException: Socket is closed
	at java.net.Socket.setReuseAddress(Socket.java:1448)
	at com.javaTpoint.JavaSocketSetReuseAddressExample3.main(JavaSocketSetReuseAddressExample3.java:15)

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