编译器高级研究的理想平台

  1 package Com.Table;
  2 
  3 public abstract class TwelveTable {
  4     abstract int area();
  5     abstract int perimeter();
  6 }
  7  
  8 
  9 class Rect extends TwelveTable
 10 {
 11     int length;
 12     int wight;
 13     public int getLength() {
 14         return length;
 15     }
 16  
 17     public void setLength(int length) {
 18         this.length = length;
 19     }
 20  
 21     public int getWight() {
 22         return wight;
 23     }
 24  
 25     public void setWight(int wight) {
 26         this.wight = wight;
 27     }
 28  
 29     @Override
 30     int area() {
 31  
 32         return length * wight;
 33     }
 34  
 35     @Override
 36     int perimeter() {
 37         return (length + wight) * 2;
 38     }
 39 }
 40  
 41 
 42 class Trangle extends TwelveTable
 43 {
 44     int aSide;
 45     int bSide;
 46     int cSide;
 47  
 48     public int getaSide() {
 49         return aSide;
 50     }
 51  
 52     public void setaSide(int aSide) {
 53         this.aSide = aSide;
 54     }
 55  
 56     public int getbSide() {
 57         return bSide;
 58     }
 59  
 60     public void setbSide(int bSide) {
 61         this.bSide = bSide;
 62     }
 63  
 64     public int getcSide() {
 65         return cSide;
 66     }
 67  
 68     public void setcSide(int cSide) {
 69         this.cSide = cSide;
 70     }
 71  
 72     @Override
 73     int area() {
 74         int s = (aSide + bSide + cSide) / 2;
 75         double area = (double) (s * (s - aSide) * (s - bSide) * (s - cSide));
 76         return (int) Math.pow(area, 0.5);
 77     }
 78  
 79     @Override
 80     int perimeter() {
 81         return aSide + bSide + cSide;
 82     }
 83 }
 84 
 85 
 86  
 87 class Round extends TwelveTable
 88 {
 89     int Rides;
 90  
 91     public int getRides() {
 92         return Rides;
 93     }
 94  
 95     public void setRides(int rides) {
 96         Rides = rides;
 97     }
 98  
 99     @Override
100     int area() {
101         return (int) (Rides * Rides * 3.14);
102     }
103  
104     @Override
105     int perimeter() {
106         return (int) (2 * Rides * 3.14);
107     }
108 }
109  
110 
111 class ExObj
112 {
113     public static void main(String []args)
114     {
115         Rect rc = new Rect();
116         rc.setLength(3);
117         rc.setWight(4);
118         System.out.println("矩形面积 = " + rc.area()
119                 + ",矩形周长 = " + rc.perimeter());
120  
121         Trangle tg = new Trangle();
122         tg.setaSide(3);
123         tg.setbSide(4);
124         tg.setcSide(5);
125         System.out.println("三角形面积 = " + tg.area()
126                 + ",三角形周长 = " + tg.perimeter());
127  
128         Round rd = new Round();
129         rd.setRides(2);
130         System.out.println("圆面积 = " + rd.area()
131                 + ",圆周长 = " + rd.perimeter());
132     }
133 }