Java Socket isOutputShutdown() method

Last Updated : 17 Mar 2025

The isOutputShutdown () method of Java Socket class returns a Boolean value 'true' if the write-half of the socket connection has been closed successfully, else it returns false.

Syntax

Parameter

Return

The isOutputShutdown () method would return a Boolean value 'true' if the output of the socket has been shut down.

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketIsOutputShutdownExample1  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        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 inetAddress and port
        socket.bind(socketAddress);
        //the connection will not establish without binding the socket with bind() method
        socket.connect(socketAddress);
        //shutting down the output
        socket.shutdownOutput();
        //isConnected() method returns the connected state of the socket
        System.out.println("The socket is connected: "+socket.isConnected());
        //isBound() method returns the binding state of the socket
        System.out.println("The socket is bounded: "+socket.isBound());
        //isOutputShutdown() returns a boolean value ?true? if the write-half of the socket connection has been closed
        System.out.println("Output is shutdown: "+socket.isOutputShutdown());
    }
}

Output:

The socket is connected: true
The socket is bounded: true
Output is shutdown: true

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketIsOutputShutdownExample2  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        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 inetAddress and port
        socket.bind(socketAddress);
        //the connection will not establish without binding the socket with bind() method
        socket.connect(socketAddress);
        //isConnected() method returns the connected state of the socket
        System.out.println("The socket is connected: "+socket.isConnected());
        //isBound() method returns the binding state of the socket
        System.out.println("The socket is bounded: "+socket.isBound());
        //It will return false as the output has not been shutdown
        System.out.println("Output is shutdown: "+socket.isOutputShutdown());
    }
}

Output:

The socket is connected: true
The socket is bounded: true
Output is shutdown: false

Example 3

import java.io.IOException;
import java.net.*;
public class JavaSocketIsOutputShutdownExample3  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //shutting down the output
        socket.shutdownOutput();
        //isOutputShutdown() returns whether the write-half of the socket connection is closed.
        //the socket should be connected else it will throw an SocketException
        System.out.println("output is shutdown: "+socket.isOutputShutdown());
    }
}

Output:

Exception in thread "main" java.net.SocketException: Socket is not connected
	at java.net.Socket.shutdownOutput(Socket.java:1553)
	at com.tpointtech.JavaSocketIsOutputShutdownExample3.main(JavaSocketIsOutputShutdownExample3.java:10)

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Java Socket isOutputShutdown() method

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Java Socket isOutputShutdown() method

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Return

Example 1

Example 2

Example 3

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