Java - Socket toString() Method

Description

The Java Socket toString() returns the string represntation of the socket.

Declaration

Following is the declaration for java.net.Socket.toString() method

public String toString()

Parameters

NA

Return Value

a string representation of this socket.

Exception

N/A

Example 1

The following example shows the usage of Java Socket toString() method to get the string representation of this socket instance. As first step, we've created a Socket instance using no argument constructor. Then in order to create a SocketAddress object, we've initialized an InetAddress instance of localhost address. Using InetSocketAddress object, we've created a SocketAddress object and then using bind() method, we bind the address to the socket. Now we're printing the socket using toString(). Once done, we're printing the keep alive flag using getKeepAlive() method, local port and inetaddress as shown. In the end, we closed the socket using close() method.

package com.tutorialspoint;

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;

public class SocketDemo {
   public static void main(String[] args) throws IOException {
      Socket socket = new Socket();  
      InetAddress inetAddress=InetAddress.getByName("localhost");  
      SocketAddress socketAddress=new InetSocketAddress(inetAddress, 6066);  
      socket.bind(socketAddress); 
      
      System.out.println("Socket: "+socket.toString()); 
      System.out.println("Port number: "+socket.getLocalPort()); 
      System.out.println("Inet Address: "+socket.getInetAddress()); 
      socket.close();
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Socket: Socket[unconnected]
Port number: 6066
Inet Address: null

Example 2

The following example shows the usage of Java Socket toString() method to get the string representation of this socket instance. As first step, we've created a Socket instance using no argument constructor. Now, we're printing the keep alive flag using getKeepAlive() method. Then we're setting the keep alive flag as true using setKeepAlive() method and print the same. Now we're printing the socket using toString(). In the end, we closed the socket using close() method.

package com.tutorialspoint;

import java.io.IOException;
import java.net.Socket;

public class SocketDemo {
   public static void main(String[] args) throws IOException {
      Socket socket = new Socket();  

      System.out.println("Is Keep Alive: "+socket.getKeepAlive());
      socket.setKeepAlive(true);  
      System.out.println("Is Keep Alive: "+socket.getKeepAlive());
      System.out.println("Socket: "+socket.toString()); 
      socket.close();
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Is Keep Alive: false
Is Keep Alive: true
Socket: Socket[unconnected]

Example 3

The following example shows the usage of Java Socket toString() method to get the string representation of this socket instance, if socket is already closed. As first step, we've created a Socket instance using no argument constructor. Using socket.close(), we're closing the socket. Now, we're printing the keep alive flag using getKeepAlive() method. Then we're setting the keep alive flag as true using setKeepAlive() method and print the same. In the end, we closed the socket using close() method. Now we're printing the socket using toString() to see if it still works.

package com.tutorialspoint;

import java.io.IOException;
import java.net.Socket;

public class SocketDemo {
   public static void main(String[] args) throws IOException {
      Socket socket = new Socket();  

      System.out.println("Is Keep Alive: "+socket.getKeepAlive());
      socket.setKeepAlive(true);  
      System.out.println("Is Keep Alive: "+socket.getKeepAlive());
      socket.close();
      System.out.println("Socket: "+socket.toString()); 
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Is Keep Alive: false
Is Keep Alive: true
Socket: Socket[unconnected]