输出如下代码的运行结果
public class MethodParamsPassTest {
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;
}
输入结果
i = 1
str = hello
num = 200
arr = [2, 2, 3, 4, 5]
my.a = 11
考点
- 方法的参数传递机制
- 实参是引用数据类型
- 传递地址值
- 特殊的类型:String、包装类等对象不可变性
内存分析图
源码地址
源码地址