Java OCA OCP Practice Question 2546

Question

What is the result of the following code? 

String s1 = "Canada"; 
String s2 = new String(s1); 
if(s1 == s2) System.out.println("s1 == s2"); 
if(s1.equals(s2)) System.out.println("s1.equals(s2)");
  • A. There is no output.
  • B. s1 == s2
  • C. s1.equals(s2)
  • D. Both B and C.
  • E. The code does not compile.
  • F. The code throws a runtime exception.


C.

Note

s1 points to the string pool.

s2 points to an object on the heap, since it is created at runtime.

== checks for reference equality.

These are different references, making B incorrect.

String overrides equals() so the actual values are the same, making C correct.

And yes, this question could have appeared on the OCA.

Remember that the OCP is cumulative.

A question may appear to be about one thing and actually be about a simpler concept.




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