Java Practice Quiz on Exception Handling

The built-in base class in Java, which is used to handle all exceptions is:

• Raise

• Exception

• Error

• Throwable

Which of these is a super class of all errors and exceptions in the Java language?

• RunTimeExceptions

• Throwable

• Catchable

• None

Predict the output of following Java program

class Main

{

public static void main(String args[])

{

try

{

throw 10;

}

catch(int e)

{

System.out.println("Got the Exception " + e);

}

}

}

• Got the Exception 10

• Got the Exception 0

• Compiler Error

class Test extends Exception { }

class Main {

public static void main(String args[]) {

try {

throw new Test();

}

catch(Test t) {

System.out.println("Got the Test Exception");

}

finally {

System.out.println("Inside finally block ");

}

}

}

• Got the Test Exception

  Inside finally block

• Got the Test Exception

• Inside finally block

• Compiler Error

Output of following Java program?

class Main {

public static void main(String args[]) {

int x = 0;

int y = 10;

int z = y/x;

}

}

• Compiler Error

• Compiles and runs fine

• Compiles fine but throws ArithmeticException exception

class Base extends Exception {}

class Derived extends Base {}

public class Main {

public static void main(String args[]) {

// some other stuff

try {

// Some monitored code

throw new Derived();

}

catch(Base b) {

System.out.println("Caught base class exception");

}

catch(Derived d) {

System.out.println("Caught derived class exception");

}

}

}

• Caught base class exception

• Caught derived class exception

• Compiler Error because derived is not throwable

• Compiler Error because base class exception is caught before derived class

class Test

{

public static void main (String[] args)

{

try

{

int a = 0;

System.out.println ("a = " + a);

int b = 20 / a;

System.out.println ("b = " + b);

}

catch(ArithmeticException e)

{

System.out.println ("Divide by zero error");

}

finally

{

System.out.println ("inside the finally block");

}

}

}

• Compile error

• Divide by zero error

• a = 0

  Divide by zero error

  inside the finally block

• a = 0

• inside the finally block

class Test

{

public static void main(String[] args)

{

try

{

int a[]= {1, 2, 3, 4};

for (int i = 1; i <= 4; i++)

{

System.out.println ("a[" + i + "]=" + a[i] + "n");

}

}

catch (Exception e)

{

System.out.println ("error = " + e);

}

catch (ArrayIndexOutOfBoundsException e)

{

System.out.println ("ArrayIndexOutOfBoundsException");

}

}

}

• Compiler error

• Run time error

• ArrayIndexOutOfBoundsException

• Error Code is printed

• Array is printed

Predict the output of the following program.

class Test

{

String str = "a";

void A()

{

try

{

str +="b";

B();

}

catch (Exception e)

{

str += "c";

}

}

void B() throws Exception

{

try

{

str += "d";

C();

}

catch(Exception e)

{

throw new Exception();

}

finally

{

str += "e";

}

str += "f";

}

void C() throws Exception

{

throw new Exception();

}

void display()

{

System.out.println(str);

}

public static void main(String[] args)

{

Test object = new Test();

object.A();

object.display();

}

}

• abdef

• abdec

• abdefc

Predict the output of the following program.

class Test

{ int count = 0;

void A() throws Exception

{

try

{

count++;

try

{

count++;

try

{

count++;

throw new Exception();

}

catch(Exception ex)

{

count++;

throw new Exception();

}

}

catch(Exception ex)

{

count++;

}

}

catch(Exception ex)

{

count++;

}

}

void display()

{

System.out.println(count);

}

public static void main(String[] args) throws Exception

{

Test obj = new Test();

obj.A();

obj.display();

}

}

• 4

• 5

• 6

• Compile Error