Example

class Demo
{
	synchronized void print(int n)    //synchronized method
	{                                                                             
		for(int i=1;i<=3;i++)
		{
			System.out.println(n*i);
			try
			{
				Thread.sleep(500);
			}
			catch(Exception e)
			{
				System.out.println(e);
			}
		}
	}
	class MyThread1 extends Thread
	{
		Demo d;
		MyThread1(Demo d)
		{
			this.d=d;
		}
		public void run()
		{
			d.print(5); 
		} 
	}
	class MyThread2 extends Thread
	{
		Demo d;
		MyThread2(Demo d)
		{
		this.d=d;
	}
	public void run()
	{
		d.print(10);
	}
}
public class SynchronizationExa1
{ 
	public static void main(String args[])
	{
		Demo obj = new Demo();                        
		MyThread1 obj1=new MyThread1(obj);
		MyThread2 obj2=new MyThread2(obj);  
		obj1.start(); 
		obj2.start(); 					  
	}
}