public class Sample {

    public static void main(String[] args) {

        int num1 = , num2 = ;

        int num3 = , num4 = ;

        ++num1;

        System.out.println("now num1: " + num1);

        System.out.println("now num2: " + (++num2)); // first the num2 gets incremented

        System.out.println("now num3: " + (num3++));

        num4++;

        System.out.println("now num4: " + (num4));

    }

}

OUTPUT:

now num1:

now num2:

now num3:

now num4: 

public class Sample {

    public static void main(String[] args) {

        int num = ;

        System.out.println("now num: " + (num++)); // this is post increment

        System.out.println("now num: " + num);

    }

}

OUTPUT:

now num:

now num: