Explanations “Top Java Quiz Questions”

Given the method, how many lines contain compilation errors?

❌ A. None, the code compiles without issue
❌ B. 1
❌ C. 2
❌ D. 3
✅ E. 4
❌ F. 5
❌ G. 6
❌ H. The code compiles but may produce an error at runtime

Explanation
This code contains numerous compilation errors, making options A and H incorrect. All of the compilation errors are contained within the switch statement. The default statement is fine and does not cause any issues. The first case statement does not compile, as continue cannot be used inside a switch statement. The second case statement also does not compile. While the thursday variable is marked final, it is not a compile-time constant required for a switch statement, as any int value can be passed in at runtime. The third case statement is valid and does compile, as break is compatible with switch statements. The fourth case statement does not compile. Even though Sunday is effectively final, it is not a compile-time constant. If it were explicitly marked final, then this case statement would compile. Finally, the last case statement does not compile because DayOfWeek.MONDAY is not an int value. While switch statements do support enum values, each case statement must have the same data type as the switch variable otherDay, which is int. Since exactly four lines do not compile, option E is the correct answer.

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930 viewsNov 8, 2022 at 11:05

Given the method, how many lines contain compilation errors?

❌ A. None, the code compiles without issue
❌ B. 1
❌ C. 2
❌ D. 3
✅ E. 4
❌ F. 5
❌ G. 6
❌ H. The code compiles but may produce an error at runtime

Explanation
This code contains numerous compilation errors, making options A and H incorrect. All of the compilation errors are contained within the switch statement. The default statement is fine and does not cause any issues. The first case statement does not compile, as continue cannot be used inside a switch statement. The second case statement also does not compile. While the thursday variable is marked final, it is not a compile-time constant required for a switch statement, as any int value can be passed in at runtime. The third case statement is valid and does compile, as break is compatible with switch statements. The fourth case statement does not compile. Even though Sunday is effectively final, it is not a compile-time constant. If it were explicitly marked final, then this case statement would compile. Finally, the last case statement does not compile because DayOfWeek.MONDAY is not an int value. While switch statements do support enum values, each case statement must have the same data type as the switch variable otherDay, which is int. Since exactly four lines do not compile, option E is the correct answer.

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