Today's java Quiz 2

This quiz comprises of very basic/intermediate level of java concept questions. See how much you score out of 10. 

Note : Answers to each question is given at the end.

1. You can call parent class constructor from child class using

• this
• final
• super()
• strictfp

2. This variable shares same memory space

• final
• instance 
• strictfp
• static

3. You can overload a method by

• changing number of arguments
• changing return type of method
• changing data type of arguments
• 1 & 3 option

4. CopyOnWriteArrayList is

• fail safe
• fail fast

5.  String a = "10";

     String b = a;

Which variable is eligible for garbage collection?

• b 
• a 
• both a & b 

6. private class A{

         public static void main(String[] args){

              System.out.print("Success");

   }

}

What will be the outcome of this code snippet?

• Success
• run time error
• compile time error
• none

7. String class implements this interface

• Cloneable
• Serializable
• Runnable
• Random Access

8. In case you add duplicate key-value pair in HashMap, what will happen?

• Exception will be thrown
• duplicate key-value will override the previous entry
• new entry will be created for duplicate 
• none

9. Can we start a thread twice?

• yes
• no

10. What is default priority value of thread?

• 1
• 2
• 5
• 10

Answer:

1-super()     2-static    3-1&3 option    4-fail safe    5-a    6-compile time error   7-Serializable

8-duplicate key-value will override the previous entry   9-no    10-5

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