Java ServerSocket bind() method

The bind() method of Java ServerSocket class binds the ServerSocket to the specified socket address, i.e. IP address and port number.

If the specified address is null, the system will automatically pick up an ephemeral port and a valid local address to bind this socket.

In the second syntax, the backlog argument is the requested maximum number of pending connections on the socket. The specified backlog should always be greater than 0. If the backlog's value is less than or equal to 0, then an implementation specific default value will be used.

Syntax

public void bind (SocketAddress endpoint)throws IOException
public void bind(SocketAddress endpoint, int backlog)  throws IOException

Parameter

The parameter 'endpoint' represents the IP address and port number to bind to.
The parameter 'backlog' represents the maximum length of the queue of incoming connections.

Return

Throws

IOException- if the socket is already bound or bound if the bind operation fails

SecurityException- if the SecurityManager is present and its checkListenmethod doesn't permit the operation

IllegalArgumentException- if the endpoint is a SocketAddress subclass which is not supported by this socket

Example 1

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.SocketAddress;
public class JavaServerSocketBindExample1 {
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);
//bind() method  the ServerSocket to the specified socket address
serverSocket.bind(endPoint);
//getLocalSocketAddress() returns the local socket address
System.out.println("Local Socket Address: "+serverSocket.getLocalSocketAddress());
    }
}

Output:

Local Socket Address: localhost/127.0.0.1:1085

Example 2

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.SocketAddress;
public class JavaServerSocketBindExample2 {
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);
//bind() method  the ServerSocket to the specified socket address
        //closing the serverSocket
serverSocket.close();
//it will throw an error as the socket is already closed
serverSocket.bind(endPoint);
System.out.println("Local Socket Address: "+serverSocket.getLocalSocketAddress());
    }
}

Output:

Exception in thread "main" java.net.SocketException: Socket is closed
	atjava.net.ServerSocket.bind(ServerSocket.java:359)
	atjava.net.ServerSocket.bind(ServerSocket.java:329)
	at com.javaTpoint.JavaServerSocketBindExample2.main(JavaServerSocketBindExample2.java:21)

Example 3

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.SocketAddress;
public class JavaServerSocketBindExample3 {
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);
intbacklog=10;
//bind() method  the ServerSocket to the specified socket address and requested maximum length of the queue
serverSocket.bind(endPoint, backlog);
System.out.println("Local Socket Address: "+serverSocket.getLocalSocketAddress());
    }
}

Output:

Local Socket Address: localhost/127.0.0.1:1085

Example 4

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.SocketAddress;
public class JavaServerSocketBindExample4 {
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 backlog is less than or equal to 0, then an implementation specific default will be used
intbacklog=Integer.MIN_VALUE;
//bind() method  the ServerSocket to the specified socket address and requested maximum length of the queue
serverSocket.bind(endPoint, backlog);
System.out.println("Local Socket Address: "+serverSocket.getLocalSocketAddress());
System.out.println("Channel: "+serverSocket.getChannel());
    }
}

Output:

Local Socket Address: localhost/127.0.0.1:1085
Channel: null

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