CODE EXAMPLE FOR JAVA

Synchronized Method in Java

// Example illustrates multiple threads are executing
// on the same Object at same time without synchronization.
import java.io.*;
  
class Line
{
    // if multiple threads(trains) will try to
    // access this unsynchronized method,
    // they all will get it. So there is chance
    // that Object's  state will be corrupted.
    public void getLine()
    {
        for (int i = 0; i < 3; i++)
        {
            System.out.println(i);
            try
            {
                Thread.sleep(400);
            }
            catch (Exception e)
            {
                System.out.println(e);
            }
        }
    }
}
  
class Train extends Thread
{
    // reference to Line's Object.
    Line line;
  
    Train(Line line)
    {
        this.line = line;
    }
  
    @Override
    public void run()
    {
        line.getLine();
    }
}
  
class GFG
{
    public static void main(String[] args)
    {
        // Object of Line class that is shared
        // among the threads.
        Line obj = new Line();
  
        // creating the threads that are
        // sharing the same Object.
        Train train1 = new Train(obj);
        Train train2 = new Train(obj);
  
        // threads start their execution.
        train1.start();
        train2.start();
    }
}