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Increment (++) / Decrement (--) Operators

  • Increment operator will be used to increase the value of the variable by 1.
  • Decrement operator will be used to decrease the value of the variable by 1.
  • Increment / Decrement operator can't be applied for value/constant.

Lab117.java​

class Lab117 {

  public static void main(String[] args) {
    int a = 10;
    System.out.println(a);
    a++;
    System.out.println(a);

    int b = 10;
    System.out.println(b);
    b--;
    System.out.println(b);
  }
}

Lab118.java​

class Lab118 {

  public static void main(String[] args) {
    int a = 10++;
    final int A = 10;
    A++;
  }
}

Lab119.java​

class Lab119 {

  public static void main(String[] args) {
    int x = 10;
    (x++)++;
  }
}

Lab120.java​

class Lab120 {

  public static void main(String[] args) {
    int a;
    int b = 0;
    (a = b++)++;
  }
}

These operators can be used in two ways:​

1) Prefix Operator​

Syntax:

<Operator> <Operand>

Example:

++a
--a

2) Postfix Operator​

Syntax:

<Operand> <Operator>

Example:

a++
a--

Lab121.java​

class Lab121 {

  public static void main(String[] args) {
    int a = 10;
    a++;
    System.out.println(a);
    System.out.println();

    int b = 10;
    ++b;
    System.out.println(b);
  }
}

Lab122.java​

class Lab122 {

  public static void main(String[] args) {
    int a = 10;
    int b = a++;
    System.out.println(a);
    System.out.println(b);
    System.out.println();

    int x = 10;
    int y = ++x;
    System.out.println(x);
    System.out.println(y);
  }
}

Lab123.java​

class Lab123 {

  public static void main(String[] args) {
    int a = 10;
    a = a++;
    System.out.println(a);

    a = a++;
    a = a++;
    System.out.println(a);
  }
}

Lab124.java​

class Lab124 {

  public static void main(String[] args) {
    int a = 10;
    a = ++a;
    System.out.println(a);

    a = ++a;
    a = ++a;
    System.out.println(a);
  }
}

Lab125.java​

class Lab125 {

  public static void main(String[] args) {
    int a = 12;
    a += a++;
    System.out.println(a);
  }
}

Lab126.java​

class Lab126 {

  public static void main(String[] args) {
    int a = 12;
    a += ++a;
    System.out.println(a);
  }
}

Lab127.java​

class Lab127 {

  public static void main(String[] args) {
    byte b = 127;
    b = b + 1;
    System.out.println(b);
  }
}

Lab128.java​

class Lab128 {

  public static void main(String[] args) {
    byte b = 127;
    b++;
    System.out.println(b);
  }
}