// Program of thread Synchronization in Java
import java.io.*;
import java.util.*;
// A Class used to send a message
class Sender
{
public void send(String msg)
{
System.out.println("Sending\t" + msg );
try
{
Thread.sleep(1000);
}
catch (Exception e)
{
System.out.println("Thread interrupted.");
}
System.out.println("\n" + msg + "Sent");
}
}
// Class for send a message using Threads
class ThreadedSend extends Thread
{
private String msg;
Sender sender;
// Recieves a message object and a string
// message to be sent
ThreadedSend(String m, Sender obj)
{
msg = m;
sender = obj;
}
public void run()
{
// Only one thread can send a message
// at a time.
synchronized(sender)
{
// synchronizing the snd object
sender.send(msg);
}
}
}
// Main Class
class Sync
{
public static void main(String args[])
{
Sender snd = new Sender();
ThreadedSend S1 =
new ThreadedSend( " Hi " , snd );
ThreadedSend S2 =
new ThreadedSend( " Bye " , snd );
// Start two threads of ThreadedSend type
S1.start();
S2.start();
// wait for threads to end
try
{
S1.join();
S2.join();
}
catch(Exception e)
{
System.out.println("Interrupted");
}
}
}
Output:
