Can you help me edit my code? I need to add the first 10 numbers and skips the next 10 numbers until I reach 100

package Alternate;

import javax.swing.JOptionPane;

public class Add {
    public static void main(String[] args){ 
        int sum = 0;
        for(int i = 1; i <= 100; i++) {
            sum = sum + i;
        }
        JOptionPane.showMessageDialog(null, "Sum : " + sum);
    }

}

Here is what I have so far. Only one for loop is allowed and 3 variables.

It must be alternately from number 1-100 (add 10 numbers, skip 10 numbers, add 10 numbers, skip 10 numbers again, until number 100) . The sum total should be 2275.

Answer

You can skip i by 11 when i % 10 == 0.

Demo:

import javax.swing.JOptionPane;

public class Main {
    public static void main(String[] args) {
        int sum = 0;
        for (int i = 1; i <= 100; i++) {
            sum = sum + i;
            if (i % 10 == 0)
                i += 11;
        }
        JOptionPane.showMessageDialog(null, "Sum : " + sum);
    }
}