Explanations “Top Java Quiz Questions”

What is the output of the code snippet?

❌ A. true true true true
❌ B. false false false false
❌ C. false true false true
✅ D. true true false true
❌ E. false true true true
❌ F. true false false true
❌ G. The code does not compile
❌ H. None of the above

Explanation:
On line 15, we have a compile-time constant that automatically gets placed in the string pool as "rat1" . On line 16, we have a more complicated expression that is also a compiletime constant. Therefore, first and second share the same string pool reference. This makes line 18 and 19 print true. On line 17, we have a String constructor. This means we no longer have a compile-time constant, and third does not point to a reference in the string pool. Therefore, line 20 prints false . On line 21, the intern() call looks in the string pool. Java notices that first points to the same String and prints true.

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623 viewsJan 12, 2022 at 09:15

What is the output of the code snippet?

❌ A. true true true true
❌ B. false false false false
❌ C. false true false true
✅ D. true true false true
❌ E. false true true true
❌ F. true false false true
❌ G. The code does not compile
❌ H. None of the above

Explanation:
On line 15, we have a compile-time constant that automatically gets placed in the string pool as "rat1" . On line 16, we have a more complicated expression that is also a compiletime constant. Therefore, first and second share the same string pool reference. This makes line 18 and 19 print true. On line 17, we have a String constructor. This means we no longer have a compile-time constant, and third does not point to a reference in the string pool. Therefore, line 20 prints false . On line 21, the intern() call looks in the string pool. Java notices that first points to the same String and prints true.

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