Java ServerSocket isClosed() method

The isClosed() method of java ServerSocket class returns the closed state of the ServerSocket.

Syntax

Parameter

Return

The isClosed() method returns a Boolean value 'true' if the socket has been closed.

Example 1

importjava.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
public class JavaServerSocketIsClosedExample1{
public static void main(String[] args) throws IOException {
InetAddressinetAddress=InetAddress.getByName("localhost");
//setting the port
intport=1085;
//calling the constructor of the ServerSocket class
ServerSocketserverSocket = new ServerSocket();
//closing the server socket
serverSocket.close();
//isClosed tell whether the server socket is closed or not
System.out.println("The server socket is closed: "+serverSocket.isClosed());
    }
}

Output:

The server socket is closed: true

Example 2

import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
public class JavaServerSocketIsClosedExample2{
public static void main(String[] args) throws IOException {
InetAddressinetAddress=InetAddress.getByName("localhost");
//setting the port
intport=1085;
//calling the constructor of the ServerSocket class
ServerSocketserverSocket = new ServerSocket();
//isClosed tell whether the server socket is closed or not
        //by default the server socket returns false
System.out.println("The server socket is closed: "+serverSocket.isClosed());
    }
}

Output:

The server socket is closed: false

Example 3

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.SocketAddress;
public class JavaServerSocketIsClosedExample3{
public static void main(String[] args) throws IOException {
InetAddressinetAddress=InetAddress.getByName("localhost");
//setting the port
intport=1085;
//calling the constructor of the ServerSocket class
ServerSocketserverSocket = new ServerSocket();
//Binding the SocketAddress with inetAddress and port
SocketAddressendPoint=new InetSocketAddress(inetAddress, port);
if(serverSocket.isClosed()){
try{
serverSocket.bind(endPoint);
            }catch(Exception e){
System.out.println("Socket is closed! bind() method will not work.");
            }
System.out.println("Binding will not ");
        }else{
serverSocket.bind(endPoint);
System.out.println("Local Socket Address: "+serverSocket.getLocalSocketAddress());
System.out.println("Port number: "+serverSocket.getLocalPort());
        }
    }
}

Output:

Local Socket Address: localhost/127.0.0.1:1085
Port number: 1085

Next TopicJava ServerSocket

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