Block Synchronization in java

Block synchronization :

• Synchronized block is used to lock an object for any shared resource.
• Scope of synchronized block is smaller than the method.
• Generally we synchronize methods as shown in the above discussion.
• Block synchronization is used to synchronize a set of lines of code in a method.
• If you put all the codes of the method in the synchronized block, it will work same as the synchronized method.

class PrintNumers
{  
	void print(int n)
	{  
		for(int i=1 ; i<=5 ; i++)
		{
			System.out.println("Parallel : "+i);
			try
			{
				Thread.sleep(500);
			}
			catch (Exception e){ }
		}
		synchronized(this)
		{
			for(int i=1;i<=5;i++)
			{  
				System.out.println("Sequential of "+n+" multiples : "+n*i);  
				try
				{  
					Thread.sleep(400);  
				}
				catch(Exception e)
				{
					System.out.println(e);
				}  
			}  
		}  
	} 
}  
  
class MyThread1 extends Thread
{  
	PrintNumers pn;  
	MyThread1(PrintNumers pn)
	{  
		this.pn = pn;  
	}  
	public void run()
	{  
		this.pn.print(5);  
	}  
}  
class MyThread2 extends Thread
{  
	PrintNumers pn;  
	MyThread2(PrintNumers pn)
	{  
		this.pn = pn;  
	}  
	public void run()
	{  
		this.pn.print(100);  
	}  
}  
  
class SynchronizedBlock
{  
	public static void main(String args[])
	{  
		PrintNumers obj = new PrintNumers();
		MyThread1 t1=new MyThread1(obj);  
		MyThread2 t2=new MyThread2(obj);  
		t1.start();  
		t2.start();  
	}  
}