Questions and answers for exam Preparation

MCQs

Total Questions : 61 | Page 5 of 7 pages

What is the output of this program?

class exception_handling {
public static void main(String args[]) {
try {
int a, b;
b = 0;
a = 5 / b;
System.out.print("A");
}
catch(ArithmeticException e) {
System.out.print("B");
}
}
}

A
B
Compilation Error
Runtime Error

Discuss Question

Answer: Option B. -> B

None.
Output:
$ javac exception_handling.java
$ java exception_handling
B

Question 42.

What will be the output of the program?

public class X
{
public static void main(String [] args)
{
try
{
badMethod();
System.out.print("A");
}
catch (Exception ex)
{
System.out.print("B");
}
finally
{
System.out.print("C");
}
System.out.print("D");
}
public static void badMethod() {}
}

AC
BC
ACD
ABCD

Discuss Question

Answer: Option C. -> ACD

There is no exception thrown, so all the code with the exception of the catch statement block is run.

Question 43.

What is the output of this program?

class exception_handling {
public static void main(String args[]) {
try {
throw new NullPointerException ("Hello");
System.out.print("A");
}
catch(ArithmeticException e) {
System.out.print("B");
}
}
}

A
B
Compilation Error
Runtime Error

Discuss Question

Answer: Option D. -> Runtime Error

try block is throwing NullPointerException but the catch block is used to counter

Arithmetic Exception. Hence NullPointerException occurs since no catch is there

which can handle it, runtime error occurs.
Output:
$ javac exception_handling.java
$ java exception_handling
Exception in thread "main" java.lang.NullPointerException: Hello

Question 44.

What is the output of this program?

class exception_handling {
public static void main(String args[]) {
try {
System.out.print("Hello" + " " + 1 / 0);
}
finally {
System.out.print("World");
}
}
}

Hello
World
Compilation Error
First Exception then World

Discuss Question

Answer: Option D. -> First Exception then World

None.
Output:
$ javac exception_handling.java
$ java exception_handling
Exception in thread "main" java.lang.ArithmeticException: / by zero
World

Question 45.

What is the output of this program?

class exception_handling {
public static void main(String args[]) {
try {
int a = args.length;
int b = 10 / a;
System.out.print(a);
}
catch (ArithmeticException e) {
System.out.println("1");
}
}
}

Note : Execution command line : $ java exception_handling

0
1
Compilation Error
Runtime Error

Discuss Question

Answer: Option B. -> 1

None.
Output:
$ javac exception_handling.java
$ java exception_handling
1

Question 46.

What will be the output of the program?

public class Test
{
public static void aMethod() throws Exception
{
try /* Line 5 */
{
throw new Exception(); /* Line 7 */
}
finally /* Line 9 */
{
System.out.print("finally "); /* Line 11 */
}
}
public static void main(String args[])
{
try
{
aMethod();
}
catch (Exception e) /* Line 20 */
{
System.out.print("exception ");
}
System.out.print("finished"); /* Line 24 */
}
}

finally
exception finished
finally exception finished
Compilation fails

Discuss Question

Answer: Option C. -> finally exception finished

This is what happens:

(1) The execution of the try block (line 5) completes abruptly because of the throw statement

(line 7).

(2) The exception cannot be assigned to the parameter of any catch clause of the try statement

therefore the finally block is executed (line 9) and "finally" is output (line 11).

(3) The finally block completes normally, and then the try statement completes abruptly because of the throwstatement (line 7).

(4) The exception is propagated up the call stack and is caught by the catch in the main method (line 20).

This prints "exception".

(5) Lastly program execution continues, because the exception has been caught, and "finished" is output

(line 24).

Question 47.

Which of these keywords is used to manually throw an exception?

try
finally
throw
catch

Discuss Question

Answer: Option C. -> throw

None.

Question 48.

What will be the output of the program?

public class RTExcept
{
public static void throwit ()
{
System.out.print("throwit ");
throw new RuntimeException();
}
public static void main(String [] args)
{
try
{
System.out.print("hello ");
throwit();
}
catch (Exception re )
{
System.out.print("caught ");
}
finally
{
System.out.print("finally ");
}
System.out.println("after ");
}
}