JavaSE 面试题: 方法的参数传递机制

Posted 2022-08-05 hglibin

JavaSE 面试题 方法的参数传递机制

import java.util.Arrays;

public class Test 
    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;

参考答案

i = 1
str = hello
num = 200
arr = [2, 2, 3, 4, 5]
my.a = 11