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What if we call run() method directly

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What if we call Java run() method directly instead start() method?

  • Each thread starts in a separate call stack.
  • Invoking the run() method from the main thread, the run() method goes onto the current call stack rather than at the beginning of a new call stack.

FileName: TestCallRun1.java

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Problem if you direct call run() method

FileName: TestCallRun2.java

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1  2  3  4  1  2  3  4  

As we can see in the above program that there is no context-switching because here t1 and t2 will be treated as normal object not thread object.

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