java中方法的参数传递机制

 
 
public class Man {
    private String name;
    private Integer age;
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public Integer getAge() {
        return age;
    }
 
    public void setAge(Integer age) {
        this.age = age;
    }
 
    @Override
    public String toString() {
        return "Man{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
 
    public Man(String name, Integer age) {
        this.name = name;
        this.age = age;
    }
 
    public static void swap(Man x, Man y) {
        Man temp = y;
        y = x;
        x = temp;
    }
}

public class Main {
 
    public static void main(String[] args) {
        Man a = new Man("a", 65);
        Man b = new Man("b", 66);
        Man.staticswap(a, b);
        System.out.println(a + "\n" + b);
    }
}

public static void swap(Man m) {
        m = new Man("xx",88);
}