import java.util.Arrays;
public class Exam4 {
    public static void main(String[] args) {
        int i = 1;
        String str = "hello";
        Integer num = 200;
        int[] arr = {1, 2, 3, 4, 5};
        MyData my = new MyData();
        change(i, str, num, arr, my);
        System.out.println("i =" + i);//1
        System.out.println("str = " + str);//hello
        System.out.println("num = " + num);//200
        System.out.println("arr = " + Arrays.toString(arr));//22345
        System.out.println("my.a = " + my.a);//11
    }
    public static void change(int j,String s, Integer n, int[] a, MyData m) {
        j += 1;
        s += "world";
        n += 1;
        a[0]+=1;
        m.a += 1;
    }
}
class MyData{
    int a = 10;
}