Java Programming — Exception Handling Questions & Answers

Q.1 Easy Exception Handling

What is the primary difference between throw and throws in Java exception handling?

A throw is used in catch block, throws is used in method declaration

B throw explicitly raises an exception, throws declares that a method may throw exceptions

C throw handles exceptions, throws creates exceptions

D Both are identical; throws is just an older syntax

Correct Answer: B. throw explicitly raises an exception, throws declares that a method may throw exceptions

EXPLANATION

'throw' is a statement that explicitly throws an exception object. 'throws' is a clause in method signature indicating the method may throw specific checked exceptions. Example: throw new IOException(); vs public void method() throws IOException {}

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Q.2 Easy Exception Handling

What is the output of the following code?
try {
int x = 10/0;
} catch(ArithmeticException e) {
System.out.println("Caught");
} finally {
System.out.println("Finally");
}
System.out.println("After");

A Caught\nFinally\nAfter

B Caught\nFinally

C Finally\nAfter

D ArithmeticException is thrown, program terminates

Correct Answer: A. Caught\nFinally\nAfter

EXPLANATION

When ArithmeticException occurs, it's caught by the catch block printing 'Caught'. The finally block always executes, printing 'Finally'. Then normal program flow continues, printing 'After'.

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Q.3 Easy Exception Handling

What will happen when the following code is executed?
try {
int[] arr = {1, 2, 3};
System.out.println(arr[5]);
} catch(ArrayIndexOutOfBoundsException e) {
System.out.println("Exception caught");
}

A Compilation error

B Runtime error without output

C Exception caught

D No output

Correct Answer: C. Exception caught

EXPLANATION

Accessing arr[5] when array has only 3 elements throws ArrayIndexOutOfBoundsException which is caught and 'Exception caught' is printed.

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Q.4 Easy Exception Handling

What is the correct syntax for declaring a method that throws a checked exception?

A public void method() throws IOException {}

B public void method() catch IOException {}

C public void method() try IOException {}

D public void method() exceptions IOException {}

Correct Answer: A. public void method() throws IOException {}

EXPLANATION

The 'throws' keyword is used in method declaration to indicate that the method might throw checked exceptions. Syntax: method() throws ExceptionType {}

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Q.5 Easy Exception Handling

Which exception is thrown when accessing an array element with an invalid index?

A IndexOutOfBoundsException

B ArrayIndexOutOfBoundsException

C ArrayAccessException

D IndexException

Correct Answer: B. ArrayIndexOutOfBoundsException

EXPLANATION

ArrayIndexOutOfBoundsException is thrown when trying to access an array element with an index that is out of the valid range (0 to length-1).

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Q.6 Easy Exception Handling

What is the output of the following code?
int x = 10;
try {
x = x / 0;
} catch (ArithmeticException e) {
x = 20;
} finally {
x = 30;
}
System.out.println(x);

A 10

B 20

C 30

D Error: compilation fails

Correct Answer: C. 30

EXPLANATION

The finally block always executes last and sets x to 30. The output will be 30 because finally block assignments override catch block assignments.

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Q.7 Easy Exception Handling

In Java exception handling, which of the following statements is true about the finally block?

A finally block executes only if an exception is thrown

B finally block executes regardless of whether an exception occurs or not

C finally block executes only if no exception is thrown

D finally block executes before the catch block

Correct Answer: B. finally block executes regardless of whether an exception occurs or not

EXPLANATION

The finally block in Java always executes whether an exception is caught or not, except when System.exit() is called or JVM terminates abnormally.

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Q.8 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.9 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.10 Easy Exception Handling

What will be the output?
public class Test {
public static void main(String[] args) {
try {
throw new Exception("Test");
} catch (Exception e) {
System.out.println("1");
} catch (Exception e) {
System.out.println("2");
}
}
}

A 1

B 1 2

C Compilation error

D 2

Correct Answer: C. Compilation error

EXPLANATION

Multiple catch blocks with the same exception type cause compilation error. Java doesn't allow duplicate catch blocks for identical exception types.

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