Increment and Decrement Operator in JAVA

package Mobile.OperatorsAndExpressions;
import java.util.Scanner;
public class IncAndDecOperators
{
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        int a,b,p1,p2,p3;
        System.out.println("Enter First Number");
        a=sc.nextInt();
        System.out.println("Enter Second Number");
        b=sc.nextInt();
        System.out.println("a="+a);
        System.out.println("b="+b);
        p1=a*b;
        System.out.println("Product="+p1);
        a++;
        b--;
        System.out.println("a is inc and b is dec");
        System.out.println("Now a="+a);
        System.out.println("and b="+b);
        p2=a*b;
        System.out.println("New Product="+p2);
        a=a+2;
        b=b-2;
        System.out.println("a is inc by 2 and b is dec by 2");
        System.out.println("Now a="+a);
        System.out.println("and b="+b);
        p3=a*b;
        System.out.println("New Product="+p3);
    }
}