使用“手机”类

public static void main(String[] args) {
        //根据Phone类，创建一个名为one的对象
        //格式：类名称 对象名 = new 类名称（）；
        phone one = new phone();
        System.out.println(one.brand); //null
        System.out.println(one.price); //0.0
        System.out.println(one.color); //null
        System.out.println("===========");
        one.brand = "华为";
        one.price = 8388.0;
        one.color = "白色";
        System.out.println(one.brand); //华为
        System.out.println(one.price); //8388.0
        System.out.println(one.color); //白色
        System.out.println("===========");
        one.call("AAAA"); //给AAAA打电话
        one.sendMessage(); //群发短信
    }