Java高频经典面试题（第一季）四：方法的参数传递机制

package will01;

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);
        System.out.println("str= "+ str);
        System.out.println("num= "+ num);
        System.out.println("arr= "+ Arrays.toString(arr));
        System.out.println("my.a= "+ my.a);
    }
    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 ;
}