synchronised

[lodha13]

class B 
{    
    public static synchronized void printName()
    {
        try
        {
	           System.out.println("printName");
	           Thread.sleep(5*1000);
        }
        catch(InterruptedException e)
        {             
        }
    }
    public synchronized void printValue()
    {      
               System.out.println("printValue");                
    }
}
public class test extends Thread
{
    B b = new B();
    public static void main(String argv[]) throws Exception
    {
	    test t = new test();
	    test v=new test();
	    Thread t1 = new Thread(t,"t1");
	    Thread t2 = new Thread(t,"t2");
	    t1.start();
	    t2.start();
    }  
    public void run()
    {      
        if(Thread.currentThread().getName().equals("t1"))
        {
            b.printName();
        }
        else
        {
            b.printValue();
        }       
    }   
}

static synchronised means locked for the class so why it is printing without any delay of 5 sec

[helloworld922]

Here's how your program flow is going:
1. main thread
start thread 2 and thread 3
2. t1 thread
print out text, wait 5 seconds
3. t2 thread
print out text

Because thread 2 and 3 are running concurently, thread 2's wait only affects thread two. Ex:

// changed the run to do something in thread 2 after the wait
if (Thread.currentThread().getName().equals("t1"))
{
     b.printName();
     System.out.println("done waiting!");
}...

After running this, you'll see:

printName
printValue
done waiting!

Also, fyi if all you're running is a static method, you don't need to create a B object in your main class. Call the static method using the class name.

B.printName();
B.printValue();

[lodha13]

no its not locking the object in case of static synchronised
in case of static
the output is
printname
printvalue
donewaiting
why

[helloworld922]

The static refers to a class state, not a specific instanced object. So, any static methods are locked to the static synchronized method, but all instance methods are left unlocked. See Instrinsic Locks and Synchronization (second section).

[media164]

nice post!
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