Java中的线程说明

Question

Is it possible to synchronize the method when we extend Thread rather than implementing Runnable ?

I know that when we use Runnable , it is possible. But when we do Thread t1 = new Thread(); , can this be done?

How can it be synchronized?

Answer 1

Synchronization is orthogonal to the class on which the method is defined. You can use synchronized in any method. It just means there's a mutex guarding that block of code.

public class MyTotallyUnspecialClass {
    synchronized public void someTotallyUnspecialMethod() {
        // this method is synchronized, with a mutex on "this"
    }
}

Answer 2

There is no effect on synchronization whether you extend Thread or implement Runnable. When you synchronize a method , you get a lock on the OBJECT and not the thread - so it really does not matter.There are many SO topics that discuss the distinction between these 2 approaches (extending thread vs implementing Runnable)