【作业】第一次JAVA作业

 1 /* 类所封装的内容：对播放器的频道及开关状态进行调整
 2  * 属性：调高、调低频道；开、关播放器
 3  */
 4 package Homework;    //储存在我的电脑上的 Homework 包中
 5 
 6 public class No01Homework    {    //公共方法No01Homework
 7     public static void main(String[] args)    {    //主方法
 8         Browser browser1 = new Browser();
 9         System.out.println("The browser1‘s channel is " + browser1.channel);
10         Browser browser2 = new Browser(100);
11         System.out.println("The browser2‘s channel is " + browser2.channel);
12         
13         browser1.turnOn();
14         browser1.setChannel(25);
15         System.out.println("The browser1‘s channel now is " + browser1.channel);
16         
17         browser1.channelUp();
18         System.out.println("The browser1‘s channel now is " + browser1.channel);
19         
20         browser1.channelDown();
21         System.out.println("The browser1‘s channel now is " + browser1.channel);
22         
23         browser1.turnOff();
24     }
25 }
26     
27     
28     class Browser {     //创建Browser方法
29         int channel;    //定义int变量channel
30         boolean on = false;    //定义boolean变量false
31         
32         Browser()    {    //默认constructor
33             channel = 1;
34         }
35         
36         Browser(int newChannel)    {    //constructor
37             channel = newChannel;
38         }
39         
40         public void turnOn()    {    //功能：打开播放器
41             on = true;
42         }
43         
44         public void turnOff()    {    //功能：关闭播放器
45             on = false;
46         }
47         
48         public void setChannel(int newChannel)    {    //功能：设置新频道
49             if(on && newChannel >= 1 && newChannel <= 100)    
50                 channel = newChannel;
51         }
52         
53         public void channelUp()    {    //功能：上调一个频道
54             if (on && channel < 100)
55                 channel++;
56         }
57         
58         public void channelDown()    {    //功能：下调一个频道
59             if (on && channel > 1)
60                 channel--;
61         }
62     }
63 
64