Java 类和对象7

创建一个三角形类，成员变量三边，方法求周长，创建类主类A来测试它。

 1 public class sanjiaoxing {
 2 
 3     private double a;
 4     private double b;
 5     private double c;
 6     double zhouchang;
 7 
 8     public double getA() {
 9         return a;
10     }
11 
12     public void setA(double a) {
13         this.a = a;
14     }
15 
16     public double getB() {
17         return b;
18     }
19 
20     public void setB(double b) {
21         this.b = b;
22     }
23 
24     public double getC() {
25         return c;
26     }
27 
28     public void setC(double c) {
29         this.c = c;
30     }
31 
32     sanjiaoxing(double a, double b, double c) {
33         this.a = a;
34         this.b = b;
35         this.c = c;
36     }
37 
38     public void getZhouChang() {
39         zhouchang = 0;
40         if ((a + b > c && a + c > b && b + c > a) && (a >= 0 && b >= 0 && c >= 0)) {
41             zhouchang = a + b + c;
42         } else {
43             System.out.println(this.a + "\t" + this.b + "\t" + this.c  + "三个数不能构成三角形。");
44         }
45         if (zhouchang != 0) {
46             System.out.println(this.a + "\t" + this.b + "\t" + this.c  + "三个数成功构成三角形 ，周长=" + zhouchang);
47         }
48     }
49 
50     public static void main(String[] args) {
51         sanjiaoxing s1 = new sanjiaoxing(1.4, 2.5, 3);
52         s1.getZhouChang();
53 
54         sanjiaoxing s2 = new sanjiaoxing(1, 3, 4);
55         s2.getZhouChang();
56 
57         sanjiaoxing s3 = new sanjiaoxing(1, 5, 5);
58         s3.getZhouChang();
59 
60         sanjiaoxing s4 = new sanjiaoxing(3, -4, 5);
61         s4.getZhouChang();
62     }

运行：

posted @ 2016-05-20 14:00  唐枫  阅读(239)  评论(3)  编辑  收藏  举报