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How to use preeIncrement and postincrement in java?

public class MainClass {

  public static void main(String args[]) {

    int a = 1;

    int b = 2;

    int c;

    int d;

    c = ++b;

    d = a++;

    c++;

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

    System.out.println("b = " + b);

    System.out.println("c = " + c);

    System.out.println("d = " + d);

  }

}

a = 2

b = 3

c = 4

d = 1