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I'm asking what I have understand is right or wrong?

you answered in #2 that what I understood is sleep is a static method hence it invoked with out actually creating an object reference variable. right?

yes because I'm very new to java.

Yea since sleep is a static method?

To create threading there is an object

Thread.sleep();

Is Thread is an object ? sleep is a method? I never created a object called Thread then how can it exists.