Java Socket close() method

The close() method of Java Socket class closes the specified socket. Once the socket has been closed, it is not available for further networking use. If the socket has a channel, the channel is also closed.

Syntax

Parameter

Return

Specified by

The close() method in interface AutoCloseable
The close() method in interface Closeable

Throws

IOException - if an I/O error occurs when closing this socket.

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketCloseExample1 {
    public static void main(String[] args) throws IOException {
      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);
        //closing the socket
        socket.bind(socketAddress);
        socket.connect(socketAddress);
        //binding the  socket with the inetAddress and port number
        System.out.println("Inet address: "+socket.getInetAddress());
        System.out.println("Port number: "+socket.getLocalPort());
        //closing the socket
        socket.close();
        System.out.println("After calling the close() method...");
        System.out.println("Inet address: "+socket.getInetAddress());
        System.out.println("Port number: "+socket.getLocalPort());
    }
}

Test it Now

Output:

Inet address: localhost/127.0.0.1
Port number: 1085
After calling the close() method...
Inet address: localhost/127.0.0.1
Port number: 1085

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketCloseExample2 {
    public static void main(String[] args) throws IOException {
      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);
        //closing the socket
        socket.close();
        //binding the  socket with the inetAddress and port number
        //It will throw an exception, as the socket is already closed
        socket.bind(socketAddress);
        System.out.println("Inet address: "+socket.getInetAddress());
        System.out.println("Port number: "+socket.getLocalPort());
    }
}

Test it Now

Output:

Exception in thread "main" java.net.SocketException: Socket is closed
	at java.net.Socket.bind(Socket.java:625)
	at com.javaTpoint.JavaSocketCloseExample2.main(JavaSocketCloseExample2.java:17)

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