» » » Top 20 Basic Java Interview Programs on Increment Decrement operators

  • In most of the interviews questions on increment and decrement operators will come in face to face or in written test.
  • Every Java Interview written test will have compulsory one question on increment and decrements operators.
  • Lets see some of the frequently asking java interview  programming questions on increment and decrement operators.
  • I this pre increment and post increment , pre decrement and post decrement topics will cover in below programs.
  • Normal programs: use of increment and decrement in normal scenario is same.
  • They differ in while we use them in expressions.
  • To avoid confusions for basic java learners we provided individual programs.

1.Java Interview program on pre increment operator.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a, b;
  7.      a=10;
  8.      b=++a;
  9.     System.out.println(b);
  10.  
  11. }
  12. }
Output:
  1. 11

2.Java Interview program on post increment operator.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a, b;
  7.      a=10;
  8.      b=a++;
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 11

3.Java Interview program on pre increment operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= ++a + 1;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 22

4.Java Interview program on post increment operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= a++ + 1;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 21

5.Java Interview program on pre increment operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= ++a + ++a;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 43

6.Java Interview program on post increment operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= a++ + a++;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 41

7.Java Interview program on pre and post increment operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= a++ + ++a;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 42




8.Java Interview program on pre decrement


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a, b;
  7.      a=10;
  8.      b=--a;
  9.     System.out.println(b);
  10.  
  11. }
  12. }
Output:
  1. 9

9.Java Interview program on post decrement .


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a, b;
  7.      a=30;
  8.      b=a--;
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 29

10.Java Interview program on pre decrement in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= --a - 1;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 18

11.Java Interview program on post decrement in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= a-- - 1;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 19

12.Java Interview program on pre decrement in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= --a - --a;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 1

13.Java Interview program on post decrement operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= a-- - a--;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 1

14.Java Interview program on pre and post decrement operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.    a= a--  - --a;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 2

15.Java Interview program on increment and decrement operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.   a= a--  + ++a;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 40

16.increment and decrement operators Inside println() method:



  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.    int a=1;
  7.  
  8.     System.out.println(a++);
  9.     System.out.println(a++);
  10.     System.out.println(++a);
  11.  
  12.     System.out.println(a++);
  13.     System.out.println(a++);
  14.  
  15.     System.out.println(a--);
  16.     System.out.println(a--);
  17.  
  18.     System.out.println(--a);
  19.     System.out.println(--a);
  20.     System.out.println(a--);
  21.  
  22. }
  23. }
Output:
  1. 1
  2. 2
  3. 4
  4. 4
  5. 5
  6. 6
  7. 5
  8. 3
  9. 2
  10. 2

17.Java Interview program on increment and decrement operator in println


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.    int i=15;
  7.     System.out.println(i++);
  8.     System.out.println(i--);
  9.  
  10. }
  11. }
Output:
  1. 15
  2. 16

18.Java Interview program on increment and decrement operator in println


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=10,b=10;
  7.  
  8.      for(int i=0;i<5;i++){
  9.  
  10.          if(++a>2||++b>2){
  11.             a++;
  12.            }
  13.  
  14.       }
  15.      System.out.println("a= "+a+" b="+b);
  16.  
  17. }
  18. }
Output:
  1. 20
  2. 10

   

19.Java Interview program on increment and decrement operator in loops


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int i;
  7.  
  8.     for( i=1;i<4;i++){    
  9.            
  10.          System.out.println(i);
  11.  
  12.       }
  13.       System.out.println("value of i after completion of loop: "+i);
  14.  
  15. }
  16. }
Output:
  1. 1
  2. 2
  3. 3
  4. value of i after completion of loop: 4

20.Java Interview program on increment and decrement




  1. package com.instanceofjava;
  2.  
  3. public class A{

  4.  
  5.  static int a = 1111;
  6.  static
  7.  {
  8.         a = a-- - --a;
  9.  }
  10.     
  11. {
  12.         a = a++ + ++a;
  13.  }
  14.  
  15.  public static void main(String[] args)  {
  16.  
  17.        System.out.println(a);
  18.  
  19.     }
  20.  
  21. }

Output:
  1. 2

Instance Of Java

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