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. 
   
7.     int a, b;
8.      a=10;
9.      b=++a;
10.     System.out.println(b);
11.  
12. }
13. }

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. 
   
7.     int a, b;
8.      a=10;
9.      b=a++;
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.     int a=20;
8.     a= ++a + 1;
9.  
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.     int a=20;
8.     a= a++ + 1;
9.  
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.     int a=20;
8.     a= ++a + ++a;
9.  
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.     int a=20;
8.     a= a++ + a++;
9.  
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.     int a=20;
8.     a= a++ + ++a;
9.  
10.     System.out.println(a);
11.  
12. }
13. }

Output:

1

2

4

4

5

6

5

3

2

2

8.Java Interview program on pre decrement

1. package com.instanceofjava;
2.  
3. class IncrementDemo{
4.  
5. public static void main(String [] args){ 
6. 
   
7.     int a, b;
8.      a=10;
9.      b=--a;
10.     System.out.println(b);
11.  
12. }
13. }

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. 
   
7.     int a, b;
8.      a=30;
9.      b=a--;
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.     int a=20;
8.     a= --a - 1;
9.  
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.     int a=20;
8.     a= a-- - 1;
9.  
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.     int a=20;
8.     a= --a - --a;
9.  
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.     int a=20;
8.     a= a-- - a--;
9.  
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.     int a=20;
8.    a= a--  - --a;
9.  
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.     int a=20;
8.   a= a--  + ++a;
9.  
10.     System.out.println(a);
11.  
12. }
13. }

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. 
   
7.    int a=1;
8.  
9.     System.out.println(a++);
10.     System.out.println(a++);
11.     System.out.println(++a);
12.  
13.     System.out.println(a++);
14.     System.out.println(a++);
15.  
16.     System.out.println(a--);
17.     System.out.println(a--);
18.  
19.     System.out.println(--a);
20.     System.out.println(--a);
21.     System.out.println(a--);
22.  
23. }
24. }

Output:

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. 
   
7.    int i=15;
8.     System.out.println(i++);
9.     System.out.println(i--);
10.  
11. }
12. }

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. 
   
7.     int a=10,b=10;
8.  
9.      for(int i=0;i<5;i++){
10.  
11.          if(++a>2||++b>2){
12.             a++;
13.            }
14.  
15.       }
16.      System.out.println("a= "+a+" b="+b);
17.  
18. }
19. }

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. 
   
7.     int i;
8.  
9.     for( i=1;i<4;i++){    
10.            
11.          System.out.println(i);
12.  
13.       }
14.       System.out.println("value of i after completion of loop: "+i);
15.  
16. }
17. }

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.  
6.  static int a = 1111;
7.  static
8.  {
9.         a = a-- - --a;
10.  }
11.     
12. {
13.         a = a++ + ++a;
14.  }
15.  
16.  public static void main(String[] args)  {
17.  
18.        System.out.println(a);
19.  
20.     }
21.  
22. }

Output:

1. 2

1.