函数探讨

 1  1 import java.awt.Point;
 2  2   
 3  3    class Box 
 4  4     {   int x1 = 0;
 5  5         int y1 = 0;
 6  6         int x2 = 0;
 7  7         int y2 = 0; 
 8  8    
 9  9      Box buildBox(int x1,int y1,int x2,int y2)
10 10         { this.x1 = x1;
11 11           this.y1 = y1;
12 12           this.x2 = x2;
13 13           this.y2 = y2;
14 14           return this;
15 15         }      
16 16      Box buildBox(Point topLeft,Point bottomRight)
17 17          { x1 = topLeft.x;
18 18            y1 = topLeft.y;
19 19            x2 = bottomRight.x;
20 20            y2 = bottomRight.y;
21 21            return this;
22 22           }
23 23 
24 24 
25 25      Box buildBox(Point topLeft,int w ,int h)
26 26           { x1 = topLeft.x;
27 27             y1 = topLeft.y;
28 28             x2 = (x1+w);
29 29             y2 = (y1+h);
30 30             return this;     
31 31            }
32 32        void printBox()
33 33            {
34 34              System.out.print("Box:<"+x1+","+y1);
35 35              System.out.println(","+x2+","+y2+">");
36 36            }
37 37        public static void main(String [] args)
38 38 
39 39              { Box rect = new Box();
40 40                rect.buildBox(25,25,50,50);
41 41                rect.printBox();
42 42                rect.buildBox(new Point(10,10),new Point(20,20));
43 43                rect.printBox();
44 44                rect.buildBox(new Point(10,10),50,50);
45 45                rect.printBox();
46 46 
47 47 
48 48 
49 49               }
50 50 
51 51 
52 52   
53 53      }

 1 import java.awt.Point;
 2   
 3    class Box 
 4     {   int x1 = 0;
 5         int y1 = 0;
 6         int x2 = 0;
 7         int y2 = 0; 
 8    
 9      void buildBox(int x1,int y1,int x2,int y2)
10         { this.x1 = x1;
11           this.y1 = y1;
12           this.x2 = x2;
13           this.y2 = y2;
14           
15         }      
16      void buildBox(Point topLeft,Point bottomRight)
17          { x1 = topLeft.x;
18            y1 = topLeft.y;
19            x2 = bottomRight.x;
20            y2 = bottomRight.y;
21            
22           }
23 
24 
25      void buildBox(Point topLeft,int w ,int h)
26           { x1 = topLeft.x;
27             y1 = topLeft.y;
28             x2 = (x1+w);
29             y2 = (y1+h);
30                  
31            }
32        void printBox()
33            {
34              System.out.print("Box:<"+x1+","+y1);
35              System.out.println(","+x2+","+y2+">");
36            }
37        public static void main(String [] args)
38 
39              { Box rect = new Box();
40                rect.buildBox(25,25,50,50);
41                rect.printBox();
42                rect.buildBox(new Point(10,10),new Point(20,20));
43                rect.printBox();
44                rect.buildBox(new Point(10,10),50,50);
45                rect.printBox();
46 
47 
48 
49               }
50 
51 
52   
53      }