java入门第二季--第1章 类和对象--java中的成员变量和局部变量

什么是成员变量和局部变量

成员变量和局部变量的区别

代码

/javaDemo1/src/com/imooc/Telphone.java

package com.imooc;

public class Telphone {
    //属性（有什么）
    float screen;
    float cpu;
    float mem;
    int var;
    //方法，干什么
    void call(){
        int var = 40;
        System.out.println("var" + var);
        System.out.println("打电话");
    }
    void sendMessage() {
        System.out.println("var" + var);
        System.out.println("screen:"+ screen +"cpu:"+ cpu +"发短信");
    }
}

/javaDemo1/src/com/imooc/InitailTelphone.java

package com.imooc;

public class InitailTelphone {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Telphone phone = new Telphone();
//        phone.sendMessage();
        phone.cpu = 5.0f;
        phone.screen = 3.0f;
        phone.call();
        phone.sendMessage();
    }

}