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TransferDemo3.java
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29 lines (26 loc) · 997 Bytes
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/**
* @program JavaBooks
* @description: TransferDemo3
* @author: mf
* @create: 2020/02/07 22:05
*/
package com.transfer;
public class TransferDemo3 {
public static void main(String[] args) {
// 有些程序员（甚至本书的作者）认为 Java 程序设计语言对对象采用的是引用调用，实际上，这种理解是不对的。
Student s1 = new Student("Mai");
Student s2 = new Student("Feng");
swap2(s1, s2);
System.out.println("s1:" + s1.getName());
System.out.println("s2:" + s2.getName());
// 方法并没有改变存储在变量 s1 和 s2 中的对象引用。
// swap 方法的参数 x 和 y 被初始化为两个对象引用的拷贝，这个方法交换的是这两个拷贝
}
private static void swap2(Student x, Student y) {
Student temp = x;
x = y;
y = temp;
System.out.println("x:" + x.getName());
System.out.println("y:" + y.getName());
}
}