Java OCA OCP Practice Question 113

Question

Suppose MyThread extends java.lang.Thread.

MyRunnable implements java.lang.Runnable but does not extend Thread.

Both classes have no-args constructors.

Which of the following cause a thread in the JVM to begin execution?

Choose all correct options. 

A.  (new MyThread()).start(); 
B.  (new MyThread()).run(); 
C.  (new MyRunnable()).run(); 
D.  (new Thread(new MyRunnable())) 
E.   .start(); 



A, D.

Note

A is correct because the start() method of Thread causes a thread to begin execution of the thread object's run() method.

Calling run() directly as in B and C just causes the run() method to execute in the current thread.

D creates a new thread whose target is an instance of MyRunnable; this is the typical way to use the Runnable interface.




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