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(); }}新闻热点
疑难解答
