函数探讨

 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      Box 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           return this;
15         }      
16      Box buildBox(Point topLeft,Point bottomRight)
17          { x1 = topLeft.x;
18            y1 = topLeft.y;
19            x2 = bottomRight.x;
20            y2 = bottomRight.y;
21            return this;
22           }
23 
24 
25      Box buildBox(Point topLeft,int w ,int h)
26           { x1 = topLeft.x;
27             y1 = topLeft.y;
28             x2 = (x1+w);
29             y2 = (y1+h);
30             return this;     
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      }

import java.awt.Point;
  
   class Box 
    {   int x1 = 0;
        int y1 = 0;
        int x2 = 0;
        int y2 = 0; 
   
     void buildBox(int x1,int y1,int x2,int y2)
        { this.x1 = x1;
          this.y1 = y1;
          this.x2 = x2;
          this.y2 = y2;
          
        }      
     void buildBox(Point topLeft,Point bottomRight)
         { x1 = topLeft.x;
           y1 = topLeft.y;
           x2 = bottomRight.x;
           y2 = bottomRight.y;
           
          }


     void buildBox(Point topLeft,int w ,int h)
          { x1 = topLeft.x;
            y1 = topLeft.y;
            x2 = (x1+w);
            y2 = (y1+h);
                 
           }
       void printBox()
           {
             System.out.print("Box:<"+x1+","+y1);
             System.out.println(","+x2+","+y2+">");
           }
       public static void main(String [] args)

             { Box rect = new Box();
               rect.buildBox(25,25,50,50);
               rect.printBox();
               rect.buildBox(new Point(10,10),new Point(20,20));
               rect.printBox();
               rect.buildBox(new Point(10,10),50,50);
               rect.printBox();



              }


  
     }