面向对象03：回顾方法的调用-优快云博客

package com.oop.demo01;

public class Demo02 {
    public static void main(String[] args) {
        //静态方法 static
        Student.say1();
        //非静态方法
        Student student = new Student();
        student.say2();


    }
    public void a1(){
        b1();
    }
    public void b1(){
        a1();
    }

    public static void a2(){
        b2();
    }
    public static void b2(){
        a2();
    }

    public static void a3(){
        //b3();    报错
    }
    public  void b3(){
        a3();
    }




}

package com.oop.demo01;

//学生类
public class Student {

    //方法
    public static void say1(){
        System.out.println("学生说话了");
    }

    //方法
    public void say2(){
        System.out.println("学生说话了");
    }
}

package com.oop.demo01;

public class Demo03 {
    public static void main(String[] args) {
        int add = Demo03.add(1,2);
        System.out.println(add);
    }


    public static int add(int a, int b){
        return a+b;
    }
}

package com.oop.demo01;

//值传递
public class Demo04 {
    public static void main(String[] args) {
        int a =1;
        System.out.println(a);

        Demo04.change(a);

        System.out.println(a);
    }
    //返回值为空
    private static void change(int a) {
        a = 10;
    }
}

package com.oop.demo01;

//引用传递：对象，本质还是值传递
public class Demo05 {
    public static void main(String[] args) {
        Person person = new Person();
        person.name = "123";
        System.out.println(person.name);   //123
        person.change(person);
        System.out.println(person.name);   //epfox

    }
}


//定义了一个Person类，有一个属性：name
class Person{
    String name;

    public void change(Person person){
        person.name = "epfox";
    }
}