Exception Handling and Multithreading

What should the return type of method where there is no return value?

String s=null;

• NullPointerException

• Handles Exception

• ArithmeticException

• None of the above

What causes the program to exit abruptly and hence its usage should be minimalistic?

• Try

• finally

• Exit

• catch

Answer explanation

In case of exit, the program exits abruptly hence would never be able to debug the root cause of the issue

Which one of the following causes memory leak?

• Release database connection when querying is complete

• Use Finally block as much as possible

• Release instances stored in static tables

• Not using Finally block often

Can we execute multiple exceptions at a time

• Yes

• No

Which of these is a super class of all exceptional type classes?

• String

• Runtime exceptions

• Throwable

• Cacheable

Match the following according to choices for the below code

1.try{

}

catch(Exception e){ }

2.try{

int a=100,b=0,c;

c=a/b;}

catch(ae){}

3.try{

int a[]=new int[10];

a[50]=100;}

catch(Aie)

4.NullPointerException

5.BufferedReader

• 3.Exception

  5.ArithmeticException

  4.ArrayIndexOutOfBoundsException

  2.Strings=null

  1.BufferedReader

• 2.Exception

  3.ArithmeticException

  4.ArrayIndexOutOfBoundsException

  5.Strings=null

  1.BufferedReader

• 1.Exception

  3.ArithmeticException

  5.ArrayIndexOutOfBoundsException

  4.String s=null

  2.BufferedReader

• 1.Exception

  2.ArithmeticException

  3.ArrayIndexOutOfBoundsException

  4.String s=null

  5.BufferedReader

What will be the output of the following Java code?

1. 
   class exception_handling

2. {

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

4. {

5. try

6. {

7. System.out.print("Hello" + " " + 1 / 0);

8. }

9. finally

10. {

11. System.out.print("World");

12. }

13. }

14. }

• Hello

• World

• Compilation error

• First Exception then World

What exception thrown by parseInt() method?

int a=Integer.parseInt(" ");

• ArithmeticException

• ClassNotFoundException

• NullPointerException

• NumberFormatException

Which of these class is related to all the exceptions that cannot be caught?

Error or Exception or RunTimeException or All

JDK is

JRE is

JIT is

JNI is

Performance Engine is

Match the above with following abbreviations

• Java Runtime environment

  Java development toolkit

  Just In Time

  Java Native Interface

  Java Hotspot

• Java development toolkit

  Just In Time

  Java Native Interface

  Java Hotspot

  Java Runtime environment

• Java development toolkit

  Java Runtime environment

  Just In Time

  Java Native Interface

  Java Hotspot

• Java Runtime environment

  Java development toolkit

  Java Hotspot

  Java Native Interface

  Just In Time