Java Socket setTcpNoDelay() method

Last Updated : 17 Mar 2025

The setTcpNoDelay () method of Java Socket class enables or disables the TCP_NODELAY option.

Syntax

Parameter

The parameter 'on' represents enables or disables the TCP_NODELAY option.

Return

Throws

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

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketSetTcpNoDelayExample1  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //enabling the SO_TIMEOUT option
        boolean on=true;
        //setTcpNoDelay() method enables or disables the SO_TIMEOUT option
        socket.setTcpNoDelay(on);
        //getTcpNoDelay() returns the setting for SO_TIMEOUT option
        System.out.println("SO_TIMEOUT option is enabled: "+socket.getTcpNoDelay());
    }
}

Output:

SO_TIMEOUT option is enabled: true

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketSetTcpNoDelayExample2  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //disabling the SO_TIMEOUT option
        boolean on=false;
        //setTcpNoDelay() method enables or disables the SO_TIMEOUT option
        socket.setTcpNoDelay(on);
        //getTcpNoDelay() returns the setting for SO_TIMEOUT option
        if(socket.getTcpNoDelay()){
            System.out.println("SO_TIMEOUT option is enabled");
        }
        else{
            System.out.println("SO_TIMEOUT option is disabled");
        }
    }
}

Output:

SO_TIMEOUT option is disabled

Example 3

import java.io.IOException;
import java.net.*;
public class JavaSocketSetTcpNoDelayExample3  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //closing the socket
        socket.close();
        //disabling the SO_TIMEOUT option
        boolean on=false;
        //setTcpNoDelay() method enables or disables the SO_TIMEOUT option
        //it will throw an error, as the socket is already closed
        socket.setTcpNoDelay(on);
        //getTcpNoDelay() returns the setting for SO_TIMEOUT option
        if(socket.getTcpNoDelay()){
            System.out.println("SO_TIMEOUT option is enabled");
        }
        else{
            System.out.println("SO_TIMEOUT option is disabled");
        }
    }
}

Output:

Exception in thread "main" java.net.SocketException: Socket is closed
	at java.net.Socket.setTcpNoDelay(Socket.java:979)
	at com.tpointtech.JavaSocketSetTcpNoDelayExample3.main(JavaSocketSetTcpNoDelayExample3.java:15)

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Java Socket setTcpNoDelay() method

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Java Socket setTcpNoDelay() method

Syntax

Parameter

Return

Throws

Example 1

Example 2

Example 3

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