java.net.ConnectException: Connection refused: connect

Server's code :
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;


public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);}


 public class Server{

    public  void main(String args[]) {
        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(5000);} catch (IOException e) {
            e.printStackTrace();
        }

        while (true) {
                // Wait for a client connection.
            Socket clientSocket = null;
            try {
                clientSocket = serverSocket.accept();
            } catch (IOException e) {
                e.printStackTrace();
            }

            // Create and start a thread to handle the new client

                    try {
                        // Get the socket's InputStream, to read bytes
                        // from the socket
                        InputStream in = clientSocket.getInputStream();
                        // wrap the InputStream in a reader so you can
                        // read a String instead of bytes
                        BufferedReader reader = new BufferedReader(
                                new InputStreamReader(in, Charset.forName("UTF-8")));
                        // Read from the socket and print line by line
                        String  line;
                        while ((line = reader.readLine()) != null) {
                            Toast.makeText(getApplicationContext(),line,Toast.LENGTH_LONG).show();
                        }
                    }
                    catch (IOException e) {
                        e.printStackTrace();
                    } finally {
                        // This finally block ensures the socket is closed.
                        // A try-with-resources block cannot be used because
                        // the socket is passed into a thread, so it isn't
                        // created and closed in the same block
                        try {
                            clientSocket.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }

                    }


            }
        }


 }}
Client's code :


import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.nio.charset.StandardCharsets;

public class ClientClass {
    public static void main(String args[]) {
        try (Socket socket = new Socket("192.168.1.3", 5000);) {
            // We'll reach this code once we've connected to the server

            // Write a string into the socket, and flush the buffer
            OutputStream outStream = socket.getOutputStream();
            PrintWriter writer = new PrintWriter(
                    new OutputStreamWriter(outStream, StandardCharsets.UTF_8));
            writer.println("Hello world!");
            writer.flush();
        } catch (IOException e) {
            // Exception should be handled.
            e.printStackTrace();
        }
    }
}


error :
java.net.ConnectException: Connection refused: connect
	at java.net.DualStackPlainSocketImpl.connect0(Native Method)
	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:589)
	at java.net.Socket.connect(Socket.java:538)
	at java.net.Socket.<init>(Socket.java:434)
	at java.net.Socket.<init>(Socket.java:211)
	at ClientClass.main(ClientClass.java:10)
BUILD SUCCESSFUL (total time: 2 seconds)