java只有值传递(P123)
new的对象存储的是栈中的地址,并不是对象本身。
因此在当参数进行传递的时候,单纯的对对象实例进行操作,并不会影响方法之外。
public class Person {public Person() {}public Person(String name) {this.name = name;}private String name;public String getName() {return name;}public void setName(String name) {this.name = name;}public static void xiugai(Person p){p.setName("wangwu");}public static void jiaohuan(Person p1 ,Person p2){Person temp = p1;p1 = p2;p2 = temp;xiugai(p1);}public static void main(String[] args) {Person p1 = new Person("zhagnsan");Person p2 = new Person("lisi");Person.jiaohuan(p1, p2);System.out.println(p1.getName() + " " + p2.getName());}
}
<img src="data:image/png;base64,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" alt="" />
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