Arytmetyka na zmiennych całkowitych

public class Testing {

    public static void main(String[] args) {

        int wrt = 25;
            System.out.println(wrt);
        wrt = wrt + 1;
            System.out.println(wrt);
        wrt += 1;
            System.out.println(wrt);
        wrt++;
            System.out.println(wrt);
        ++wrt;
            System.out.println(wrt);

        wrt += 1;
        wrt /= 10;
            System.out.println(wrt);

        int nowaZmienna = 10;
        nowaZmienna = nowaZmienna * wrt;
            System.out.println(nowaZmienna);
    }

}