Java Multiple Choice Questions & Answers on Throw, Throws & Nested Try for Freshers

1. Which of these keywords is used to generate an exception explicitly?

a) try
b) finally
c) throw
d) catch

Answer: c

2. Which of these class is related to all the exceptions that are explicitly thrown?

a) Error
b) Exception
c) Throwable
d) Throw

Answer: c

3. Which of these operator is used to generate an instance of an exception than can be thrown by using throw?

a) new
b) malloc
c) alloc
d) thrown

Answer: a

Explanation: new is used to create instance of an exception. All of java’s built in run-time exceptions have two constructors : one with no parameters and one that takes a string parameter.

4. Which of these handles the exception when no catch is used?

a) Default handler
b) finally
c) throw handler
d) Java run time system

Answer: a

5. Which of these keywords is used to by the calling function to guard against the exception that is thrown by called function?

a) try
b) throw
c) throws
d) catch

Answer: c

Explanation: If a method is capable of causing an exception that it does not handle. It must specify this behaviour the behaviour so that callers of the method can guard themselves against that exception. This is done by using throws clause in methods declaration.

6. What is the output of this program?

1.     class exception_handling {

2.         public static void main(String args[]) {

3.             try {

4.                 int a = args.length;

5.                 int b = 10 / a;

6.                 System.out.print(a);

7.                 try {

8.                     if (a == 1)

9.                         a = a / a - a;

10.                     if (a == 2) {

11.                         int []c = {1};

12.                         c[8] = 9;

13.                     }

14.                 }

15.                 catch (ArrayIndexOutOfBoundException e) {

16.                     System.out.println("TypeA");

17.                 }

18.                 catch (ArithmeticException e) {

19.                     System.out.println("TypeB");

20.                 }

21.             }

22.         }

23.     }

a) TypeA
b) TypeB
c) Compiler Time Error
d) 0TypeB

Answer: c

Explanation: Because we can’t go beyond array limit

7. What is the output of this program?

1.     class exception_handling {

2.         public static void main(String args[]) {

3.             try {

4.                 System.out.print("A");

5.                 throw new NullPointerException ("Hello");

6.             }

7.             catch(ArithmeticException e) {

8.                 System.out.print("B");         

9.             }

10.         }

11.     }

a) A
b) B
c) Hello
d) Runtime Exception

Answer: d

8. What is the output of this program?

1.     class exception_handling {

2.         static void throwexception() throws ArithmeticException {        

3.             System.out.print("0");

4.             throw new ArithmeticException ("Exception");

5.         }

6.         public static void main(String args[]) {

7.             try {

8.                 throwexception();

9.             }

10.             catch (ArithmeticException e) {

11.                 System.out.println("A");

12.             }

13.         }

14.     }

a) A
b) 0
c) 0A
d) Exception

Answer: c

9. What is the output of this program?

1. public class San 

2.  {  

3.     public static void main(String[] args) 

4.     {

5.         try 

6.         { 

7.             return; 

8.         } 

9.         finally 

10.         {

11.             System.out.println( "Finally" ); 

12.         } 

13.     } 

14. }

a) Finally
b) Compilation fails
c) The code runs with no output
d) An exception is thrown at runtime

Answer: a

Explanation: Because finally will execute always.

10. What is the output of this program?

1. public class San 

2. {

3.     public static void main(String args[])

4.     {

5.         try 

6.         {

7.             System.out.print("Hello world ");

8.         }

9.         finally 

10.         {

11.             System.out.println("Finally executing ");

12.         }

13.     }

14. }

a) The program will not compile because no exceptions are specified
b) The program will not compile because no catch clauses are specified
c) Hello world
d) Hello world Finally executing

Answer: d