Java OCA OCP Practice Question 1

Question

When does the string created on line 2 become eligible for garbage collection? 

1. String s = "aaa"; 
2. String t = new String(s);  
3. t += "zzz"; 
4. t = t.substring(0); 
5. t = null;
  • A. After line 3
  • B. After line 4
  • C. After line 5
  • D. The string created on line 2 does not become eligible for garbage collection in this code. 


A.

Note

Line 3 creates a new string that contains aaazzz and assigns t to point to that new string.

At that moment there are no references to the string created on line 2 ( "aaa"), so it becomes eligible for garbage collection.




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