Java基础-day09-基础题-对象;类;封装

package StudentJavaSEday09;
//定义手机类
public class Phone {
 //品牌
 String brand;
 //价格
 int price;
 //颜色
 String color;
 //打电话
 public void call(String name) {
 System.out.println("给"+name+"打电话");
 }
 //发短信
 public void sendMessage() {
 System.out.println("群发短信");
 }
}
package StudentJavaSEday09;
public class TestPhone {
 public static void main(String[] args) {
 // 创建对象
 Phone p = new Phone();
// 输出成员变量值
 System.out.println("品牌：" + p.brand);// null
 System.out.println("价格：" + p.price);// 0
 System.out.println("颜色：" + p.color);// null
 System.out.println("------------");
 // 给成员变量赋值
 p.brand = "锤子";
 p.price = 2999;
 p.color = "棕色";
 // 再次输出成员变量值
 System.out.println("品牌：" + p.brand);// 锤子
 System.out.println("价格：" + p.price);// 2999
 System.out.println("颜色：" + p.color);// 棕色
 System.out.println("------------");
 // 调用成员方法
 p.call("唐嫣");
 p.sendMessage();
 }
}

package StudentJavaSEday09;
public class Phone2 {
 public static void main(String[] args) {
 Phone p = new Phone();
 System.out.println(p.brand + "---" + p.price + "---" + p.color);
 p.brand = "锤子";
 p.price = 2999;
 p.color = "棕色";
 System.out.println(p.brand + "---" + p.price + "---" + p.color);
 p.call("林青霞");
 p.sendMessage();
 }
}

代码实现：
package StudentJavaSEday09;
public class Phone3 {
 public static void main(String[] args) {
 Phone p1 = new Phone();
 p1.brand = "小米5s";
 p1.price = 1999;
 p1.color = "银色";
 System.out.println(p1.brand + "---" + p1.price + "---" + p1.color);
 p1.call("林青霞");
 p1.sendMessage();
 Phone p2 = new Phone();
 p2.brand = "IPhone7S";
 p2.price = 7999;
 p2.color = "土豪金";
 System.out.println(p2.brand + "---" + p2.price + "---" + p2.color);
 p2.call("张曼玉");
 p2.sendMessage();
 }
}

package StudentJavaSEday09;
public class Phone4 {
 public static void main(String[] args) {
 Phone p1 = new Phone();
 p1.brand = "OPPO";
 p1.price = 2999;
 p1.color = "白色";
 System.out.println(p1.brand + "---" + p1.price + "---" + p1.color);
 Phone p2 = p1;
 p2.brand = "魅族";
 p2.price = 1999;
 p2.color = "蓝色";
 System.out.println(p1.brand + "---" + p1.price + "---" + p1.color);
 System.out.println(p2.brand + "---" + p2.price + "---" + p2.color);
 }
}