手机类练习和一个对象内存图

手机类练习

public class phone {
    String brand;
    double price;
    String color;

    public void call(String who){
        System.out.println("给"+who+"打电话");
    }
    public void sendMessage(){
        System.out.println("群发短信");
    }

    public static void main(String[] args) {
        phone phone = new phone();
        System.out.println(phone.brand);
        System.out.println(phone.price);
        System.out.println(phone.color);
        System.out.println("===================");

        phone.brand = "iQoo";
        phone.color = "渐变蓝";
        phone.price = 5000;
        System.out.println(phone.brand);
        System.out.println(phone.price);
        System.out.println(phone.color);

        phone.call("牛马");
        phone.sendMessage();
    }
}

一个对象的内存图