如何使用java中的对象

package com.imooc;
//1.定义一个类
public class Telphone {
//2.属性（成员变量）有什么
float screen;
float cpu;
float mem;
//3.方法干什么
void call(){
System.out.println("Telphone有打电话的功能！");
}
void sendMessage(){
System.out.println("screen:"+screen+" cpu:"+cpu+" mem:"+mem+" Telphone有发短信的功能！");
}
}

package com.imooc;

public class InitialTelphone {

public static void main(String[] args) {
// TODO Auto-generated method stub
Telphone phone = new Telphone();
phone.sendMessage();

//给实例变量赋值
phone.cpu = 1.4f;
phone.mem = 2.0f;
phone.screen = 5.0f;

//调用对象的方法
phone.sendMessage();
}

}