Java programming interview questions and answers for experienced

• Here some of the java programming interview questions and answers for experienced on different topics.
• Java interview programs and answers for experienced.
• Java Coding interview Questions
• Java tricky interview programs to practice.

 Program #1: what will happen if we try to print null using system.out.println

1. package interviewprograms.instanceofjava;
2. public class InterviewProgram {
3.  
4.     /**
5.      * @java programming interview questions and answers for freshers and experienced
6.      */
7.     public static void main(String[] args) {
8.         
9.         System.out.println(null);
10.  
11.     }
12.  
13. }

1. Compile time error will come

What happens When System.out.println(null)?

Program #2: Java Interview program :Can we create object for abstract class in same class

1. package interviewprograms.instanceofjava;
2. public abstract class AbstractDemo {
3.  
4. public static void main(String args[]){
5.         
6.         AbstractDemo obj = new AbstractDemo();
7.         
8.  }
9.  
10. }

1. Compile time error will come

• Its not possible to create object of abstract class in same class .
•  Compile time error will me Cannot instantiate the type AbstractDemo
• By creating sub class object which extends abstract class memory will be created for non static members of abstract class.

Program #3: Java Interview program : what will be the output of below java program

1. 2

 Program #4: Guess the order of execution of constructors

1. package interviewprograms.instanceofjava;
2. public class ConstructorDemo {
3.  
4. ConstructorDemo(){
5.         this(1);
6.         System.out.println("Zero argument constructor");
7. }
8.     
9. ConstructorDemo(int a){
10.         this("Hi",1);
11.         System.out.println("One argument constructor");
12. }
13.  
14. ConstructorDemo(String str, int x){
15.     
16.         System.out.println("Two argument constructor");
17. }
18.  
19. public static void main(String[] args) {
20.  
21.         ConstructorDemo obj =new ConstructorDemo();
22.  
23.     }
24.  
25. }

1. Two argument constructor
2. One argument constructor
3. Zero argument constructor