Assertions Questions with Answers | Java Programming MCQ | Page 2

Assertions questions with answers in Java programming test a candidate’s ability to debug and validate logic efficiently. The assert keyword is used to verify assumptions during program execution, ensuring code reliability and preventing logical errors. Many placement tests from companies like TCS, Infosys, and Wipro include Java Assertion MCQs to evaluate coding fundamentals. This section offers a collection of Java programming questions and answers with explanations to help you understand the use, syntax, and runtime behavior of assertions. Practice these questions to strengthen your programming logic and prepare effectively for technical interviews and coding tests.

Showing 10 of 45 questions

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Q11

When should assertions typically be used?

A To validate user input
B To check method parameters in public methods
C For internal invariants and debugging assumptions
D To handle file I/O errors

Answer: Option C

Explanation: Assertions are for internal invariants and debugging, not for public method parameter validation.

Q12

What is the type of exception thrown by failed assertions?

A AssertionException
B RuntimeException
C AssertionError
D ValidationException

Answer: Option C

Explanation: AssertionError extends Error, not Exception.

Q13

Which command disables assertions?

A -disableassertions or -da
B -noassertions
C -assertoff
D -disableassert

Answer: Option A

Explanation: -da or -disableassertions disables assertions.

Q14

What happens if assertions are disabled?

A Assert statements throw compile error
B Assert statements are ignored at runtime
C Program execution stops
D All assertions return false

Answer: Option B

Explanation: When disabled, assert statements have no effect at runtime.

Q15

Which Java version introduced assertions?

A Java 1.0
B Java 1.2
C Java 1.4
D Java 5

Answer: Option C

Explanation: Assertions were introduced in Java 1.4.

Q16

What is the main advantage of using assertions over regular if-checks?

A They provide better performance always
B They can be enabled/disabled without code changes
C They automatically handle exceptions
D They work better with inheritance

Answer: Option B

Explanation: Assertions can be disabled in production, removing performance overhead.

Q17

Which of these is NOT appropriate for assertions?

A Checking internal class invariants
B Validating user input in public methods
C Checking control flow assumptions
D Debugging complex calculations

Answer: Option B

Explanation: User input validation should use regular exception handling, not assertions.

Q18

What will happen if you try to catch AssertionError?

A Compilation error
B Runtime exception
C It can be caught but is not recommended
D JVM crash

Answer: Option C

Explanation: While technically possible, catching AssertionError is generally not recommended.

Q19

Which package contains AssertionError?

A java.util
B java.lang
C java.assert
D java.error

Answer: Option B

Explanation: AssertionError is in java.lang package.

Q20

What is the output of: assert false : "Error message"; when assertions enabled?

A Prints "Error message"
B Throws AssertionError with "Error message"
C Compilation error
D No output

Answer: Option B

Explanation: AssertionError with the specified message is thrown.

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