Java Programming — Exception Handling Questions & Answers

Q.31 Medium Exception Handling

What is the correct way to create a custom exception with cause chaining?

A public MyException(String msg) throws Throwable {}

B public MyException(String msg, Throwable cause) { super(msg, cause); }

C public MyException(Throwable cause) { this.cause = cause; }

D Custom exceptions cannot support cause chaining

Correct Answer: B. public MyException(String msg, Throwable cause) { super(msg, cause); }

EXPLANATION

Proper cause chaining calls super(msg, cause) in constructor, leveraging Exception's constructor that accepts both message and cause.

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Q.32 Hard Exception Handling

Which of the following scenarios will NOT trigger a StackOverflowError?

A Infinite recursive function calls without base case

B Very deep try-catch nesting (theoretically)

C Mutual recursion between multiple methods

D Creating too many local variables in a method

Correct Answer: D. Creating too many local variables in a method

EXPLANATION

StackOverflowError occurs from stack overflow due to excessive method calls. Local variables contribute to stack but won't cause overflow like recursion.

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Q.33 Hard Exception Handling

What will be printed for this code?
public class ExceptionOrder {
public static void main(String[] args) {
try {
try {
throw new RuntimeException("Inner");
} catch (Exception e) {
throw new IOException("Outer");
}
} catch (IOException e) {
System.out.println("Caught IOException");
} catch (RuntimeException e) {
System.out.println("Caught RuntimeException");
}
}
}

A Caught IOException

B Caught RuntimeException

C Compilation error

D No output

Correct Answer: C. Compilation error

EXPLANATION

IOException is a checked exception and must be declared in method signature or caught. The inner catch throws IOException which isn't caught immediately.

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Q.34 Medium Exception Handling

Consider code that implements auto-closeable resources. What is the advantage of try-with-resources statement?

A Automatic resource closure in order of declaration (LIFO)

B No need to call close() explicitly

C Suppressed exceptions are automatically added

D All of the above

Correct Answer: D. All of the above

EXPLANATION

Try-with-resources (Java 7+) automatically closes resources, handles suppressed exceptions, and closes in LIFO order without explicit close() calls.

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Q.35 Easy Exception Handling

Which of the following is NOT a subclass of Throwable?

A Exception

B Error

C RuntimeException

D Throwable itself

Correct Answer: D. Throwable itself

EXPLANATION

Throwable is the superclass. Exception and Error are direct subclasses, and RuntimeException is a subclass of Exception.

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Q.36 Easy Exception Handling

Which method is used to print the stack trace of an exception?

A printStackTrace()

B getStackTrace()

C printStack()

D Both A and B are correct

Correct Answer: D. Both A and B are correct

EXPLANATION

printStackTrace() prints to System.err, while getStackTrace() returns an array of StackTraceElement objects. Both exist and serve different purposes.

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Q.37 Medium Exception Handling

What will be the result of executing this code?
public class MultiCatchTest {
public static void main(String[] args) {
try {
int[] arr = {1, 2};
int x = arr[5];
} catch (ArrayIndexOutOfBoundsException | NullPointerException e) {
System.out.println("Array or Null Error");
}
}
}

A Array or Null Error

B Compilation error - cannot use | in catch

C ArrayIndexOutOfBoundsException thrown

D No output - exception not caught

Correct Answer: A. Array or Null Error

EXPLANATION

Multi-catch feature (Java 7+) allows handling multiple exceptions. ArrayIndexOutOfBoundsException is caught by the multi-catch block.

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Q.38 Medium Exception Handling

Which of the following best describes a custom exception in Java?

A Must extend RuntimeException directly

B Can extend Exception or RuntimeException based on whether it's checked or unchecked

C Must implement Serializable interface

D Cannot have any fields or methods

Correct Answer: B. Can extend Exception or RuntimeException based on whether it's checked or unchecked

EXPLANATION

Custom exceptions should extend Exception (for checked) or RuntimeException (for unchecked) depending on usage requirements.

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Q.39 Medium Exception Handling

What is the output of multi-level exception chaining?
public class ChainTest {
public static void main(String[] args) {
try {
try {
throw new IOException("IO Error");
} catch (IOException e) {
throw new RuntimeException("Runtime Error", e);
}
} catch (RuntimeException e) {
System.out.println(e.getCause().getClass().getSimpleName());
}
}
}

A RuntimeException

B IOException

C Throwable

D Exception

Correct Answer: B. IOException

EXPLANATION

getCause() returns the IOException that was wrapped. getClass().getSimpleName() returns 'IOException'.

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Q.40 Medium Exception Handling

Which of the following statements is true regarding exception constructors?

A Exception class has only no-argument constructor

B Exception class has constructor that accepts String message and Throwable cause

C Custom exceptions must override toString() method

D Exception constructors cannot call super() implicitly

Correct Answer: B. Exception class has constructor that accepts String message and Throwable cause

EXPLANATION

Exception class provides multiple constructors including one with String message and another with String message and Throwable cause for exception chaining.

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