How to get 4 last numbers from a variable?

Question

I have to get last numbers from a variable and I don’t know how to do it. I’m taking the milliseconds and I need to play in this variable lol, where I need you to return only the last 4 digits of lol not her whole.

package trabalho01;

import java.util.Calendar;

public class aleatorio {

    public int aleatoriar() {       
        Calendar lCDateTime = Calendar.getInstance();
        int lol = (int) (lCDateTime.getTimeInMillis());     
        return lol;
    }
}

Answer 1

You can use the module operator to get the rest of the division of 10 (our numerical base) raised to 4 (the digits you want to pick up), ie 10000.

import java.util.Calendar;

class Program {
    public static void main(String[] args) {
        System.out.println(aleatoriar());
    }
    public static int aleatoriar() {       
        Calendar lCDateTime = Calendar.getInstance();
        return (int)(lCDateTime.getTimeInMillis() % 10000);
    }
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.

The intermediate variable is unnecessary (when you have difficulty giving a meaningful name to it, it is probably not useful).