封装

来源：互联网发布：源码是啥编辑：程序博客网时间：2024/05/07 06:26

概念：将类的某些信息隐藏在类内部，不允许外部程序直接访问，而是通过该类提供的方法来实现对隐藏信息的操作和访问
好处：

只能通过规定的方法访问数据
隐藏类的实例细节，方便修改和实现

package com.imooc;public class Telphone {    private float screen;    private float cpu;    private float mem;    public Telphone(){        System.out.println("无参的构造函数执行了");       }    public Telphone(float newScreen,float newCpu,float newMem){        System.out.println("有参的构造函数执行了！");        if(newScreen<3.5){            System.out.println("输入尺寸错误，默认为3.5");            screen=3.5f;        }        else{            screen=newScreen;        }        cpu=newCpu;        mem=newMem;    }    public void setScreen(float newScreen){        screen=newScreen;    }    public float getScreen(){        System.out.println("screen="+screen);        return screen;    }}

package com.imooc;public class InitailTelphone {    public static void main(String[] args) {        // TODO Auto-generated method stub        Telphone phone=new Telphone();        //Telphone phone2=new Telphone(1.5f,2.0f,1.2f);        phone.setScreen(5.5f);        phone.getScreen();    }}

0 0