Which exception is thrown when a numeric string cannot be converted to a number?
Answer: A
NumberFormatException is thrown by Integer.parseInt(), Double.parseDouble() when string format is invalid.
Q.22Easy
What will be the output?
public class Demo {
public static void main(String[] args) {
try {
System.out.println("A");
throw new Exception("Test");
System.out.println("B");
} catch (Exception e) {
System.out.println("C");
}
}
}
Answer: B
After 'A' is printed, exception is thrown. Statement 'B' is never executed. Catch block prints 'C'.
Q.23Medium
Which statement about multiple catch blocks is TRUE?
Answer: B
Only one catch block executes for a thrown exception. The first matching catch block is executed.
Q.24Medium
Analyze the code:
public void process() throws IOException {
try {
readFile();
} catch (FileNotFoundException e) {
// handle
}
}
What is the issue here?
Answer: C
Since FileNotFoundException is a subclass of IOException, and readFile() can throw IOException, it should be caught in a separate catch block or the method signature should only throw FileNotFoundException.
Q.25Medium
What happens if you throw an exception inside the finally block?
Answer: A
If an exception is thrown in finally block, it replaces the original exception that was being propagated. The original exception is lost.
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Q.26Medium
Consider the code:
try (FileReader fr = new FileReader("file.txt")) {
// use fr
} catch (IOException e) {
// handle
}
What will happen to 'fr' after the try block?
Answer: B
Try-with-resources automatically closes resources implementing AutoCloseable interface, regardless of normal or exceptional termination.
Q.27Medium
Which of these is NOT a correct way to handle checked exceptions?
Answer: D
Checked exceptions must be either caught or declared using throws. Ignoring them causes compilation error.
Q.28Medium
What is the output?
public class Test {
public static void main(String[] args) {
int x = 0;
try {
x = 5;
System.out.println(x / 0);
x = 10;
} catch (ArithmeticException e) {
x = 15;
} finally {
System.out.println(x);
}
}
}
Answer: C
x becomes 5, then ArithmeticException occurs. x becomes 15 in catch block. Finally block prints 15.
Q.29Medium
What will happen if a finally block contains a return statement?
Answer: A
Return in finally block overrides returns in try or catch blocks. The finally return value is what gets returned.
Q.30Medium
Analyze the code:
try {
// code
} catch (IOException | SQLException e) {
// handle
}
What is this syntax called?
Answer: A
This is called multi-catch or union catch syntax (Java 7+) allowing multiple exception types to be caught in one block using pipe operator.
Q.31Medium
What is the difference between throw and throws?
Answer: A
'throw' keyword actually throws an exception object. 'throws' keyword declares that a method throws a checked exception.
Q.32Medium
Consider this code:
public static void main(String[] args) {
try {
System.out.println("A");
return;
} finally {
System.out.println("B");
}
}
What is the output?
Answer: A
Even with return in try block, finally block executes. So 'A' prints first, then 'B' before returning.
Q.33Medium
Which of the following cannot be used with try-with-resources?
Answer: C
Try-with-resources requires resources to implement AutoCloseable interface. String doesn't implement it, so it cannot be used.
Q.34Hard
What will be printed?
public class ExceptionTest {
public static void main(String[] args) {
try {
testMethod();
} catch (Exception e) {
System.out.println("Caught");
}
}
public static void testMethod() {
try {
throw new RuntimeException("Error");
} finally {
System.out.println("Finally");
}
}
}
Answer: A
Finally block executes first (prints 'Finally'), then the exception propagates to outer catch block which prints 'Caught'.
Q.35Medium
Which statement is TRUE about exception propagation in Java?
Answer: A
When an exception is thrown and not caught, it propagates up the call stack until a matching catch block is found or the program terminates.
Q.36Easy
Which of the following exceptions is a checked exception in Java?
Answer: B
SQLException is a checked exception that must be caught or declared. NullPointerException, ArrayIndexOutOfBoundsException, and ArithmeticException are unchecked exceptions (RuntimeException subclasses).
Q.37Easy
What is the correct syntax for declaring multiple exceptions in a method signature?
Answer: A
Multiple exceptions are declared using comma-separated syntax in the throws clause. Parentheses and pipe operators are not valid syntax for this purpose.
Q.38Easy
In Java exception handling, what is the purpose of the finally block?
Answer: B
The finally block executes unconditionally after try and/or catch blocks complete, making it ideal for resource cleanup. It runs even if try or catch blocks return.
Q.39Medium
What will be the behavior if an exception is thrown in the finally block?
Answer: B
If an exception occurs in finally, it will propagate and override any previous exception from try/catch blocks. However, in try-with-resources, exceptions are suppressed.
Q.40Medium
Which statement about try-with-resources (introduced in Java 7) is correct?
Answer: B
Try-with-resources automatically invokes close() on any resource implementing AutoCloseable interface. Multiple resources can be declared with semicolon separation.
