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void start() {  
    A a = new A(); 
    B b = new B(); 
    a.s(b);  
    b = null; /* Line 5 */
    a = null;  /* Line 6 */
    System.out.println("start completed"); /* Line 7 */
} 

When is the B object, created in line 3, eligible for garbage collection?

  • A.after line 5
  • B.after line 6
  • C.after line 7
  • D.There is no way to be absolutely certain.

Answer: D

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