值传递，引用传递

//值传递

public class ValueDemo{
     public static void main(String[] args){
         int x=10;
         method(x);
         System.out.println("x="+x);
     }
     public static void method(int mx){
         mx=20;
     }
    
}

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//示例二：引用传递
public class RefDemo1{
    public static void main(String[] args){
        Duck d = new Duck();
        method(d);
        System.out.println("Duck age ="+d.age);
    }
    public static void method(Duck duck){
        duck.age = 5;
    }   
}

class Duck{
    int age = 2;//省略封装
}

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/**示例三：String传递
    字符串本身就是一个对象
*/
public class RefDemo2{
    public static void main(String[] args){
        String name ="小飞";
        method(name);
        System.out.println("name ="+name);
    }
    public static void method(String sname){
        sname = "小备";
    }   
}

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//示例三：String传递
public class RefDemo3{
    public static void main(String[] args){
        Person p = new Person();
        method(p);
        System.out.println("person name ="+p.name);
    }
    public static void method(Person per){
        per.name = "备备";
    }   
}

class Person{
    String name ="飞飞";//省略封装
}

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