JavaSE面试题——方法的参数传递机制

Posted 2021-10-16 张起灵-小哥

1.Go！！！

以下代码的运行结果是：👇👇👇

import java.util.Arrays;

class MyData {
	int a = 10;
}

public class Exam {

	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 i, String str, Integer num, int[] a, MyData m){
		i += 1;
		str += "world";
		num += 1;
		a[0] += 1;
		m.a += 1;
	}
}

具体的代码执行流程，我画了两张图，如下：👇👇👇