2019-12-25

类就是马原中的“物质”，英文中的"class"。

对象就是具体的“个体。

”我是一年一班的同学，老师按照花名册随机抽取我和同学进行提问。“这个过程就是面向对象。

创建一个手机类。  

1.创建对象

2.描写类的属性

3.描写类方法

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

public class TelPhone {

//属性

    float screen;

    float cpu;

    float mem;

    //方法  干什么

    void call(){

System.out.println("telphone有打电话的功能");

    }

void sendMessage(){

System.out.println("TelPhone有发短信的功能");

    }

}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

创建一个对象：

1.创建对象

类名 对象名=new 类名();

Telphone phone=new Telphone();

2.适用对象

引用对象的属性：对象名.属性;

phone.screen=5;//给对象5赋值

引用对象的方法：对象名.方法名（）

phone.sendMessage();//调用sendMessage()方法

类是以代码形式放在内存当中的，把文件的信息放在内存当中，此时这些信息的集合就叫做做对象，这个过程叫做实例化

····················································································································································

public class IntailTelphone {

public static void main(String[] args ){

TelPhone phone=new TelPhone();

        phone.sendMessage();

        phone.screen=5.0f;

        phone.cpu=1.4f;

        phone.mem=2.0f;

        phone.sendMessage();

    }

}

······················································································································································