Assertions Questions and Answers
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.
Assertions
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45 questions
31. What is the two-form syntax of assert statement?
- Simple and complex
- Basic and advanced
- With and without message
- Conditional and unconditional
32. When should assertions typically be used?
- For validating user input
- For checking method arguments in public methods
- For internal invariants and debugging
- For handling file I/O errors
33. Which of these is NOT a valid use of assertions?
- Checking internal class invariants
- Validating input parameters in private methods
- Checking method arguments in public methods
- Verifying postconditions after method execution
34. What happens if assertions are disabled?
- They throw exceptions
- They are evaluated but ignored
- They have no effect
- They cause compilation warnings
35. Which command enables assertions for all classes except those in com.example package?
- -ea -da:com.example...
- -ea:* -da:com.example...
- -ea:-com.example...
- -enable -disable:com.example...
36. What type of exception is thrown when an assertion fails?
- AssertionException
- RuntimeException
- AssertionError
- AssertFailure
37. Which of these is a correct assertion statement with message?
- assert condition : "message";
- assert condition "message";
- assert ("message") condition;
- assert : condition "message";
38. Why should assertions not have side effects?
- They make code run slower
- They can cause different behavior when assertions are disabled
- They are illegal in Java
- They improve performance
39. What is the default state of assertions when running a Java program?
- Enabled for all classes
- Disabled for all classes
- Enabled only for system classes
- Enabled only for user classes
40. Which package contains the AssertionError class?
- java.util
- java.lang
- java.assert
- java.error