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Factory is a design pattern in common usage. Implement a ShapeFactory that can generate correct shape.
You can assume that we have only tree different shapes: Triangle, Square and Rectangle.
ShapeFactory sf = new ShapeFactory();
Shape shape = sf.getShape("Square");
shape.draw();
>> ----
>> | |
>> | |
>> ----
shape = sf.getShape("Triangle");
shape.draw();
>> />> / >> /____
shape = sf.getShape("Rectangle");
shape.draw();
>> ----
>> | |
>> ----
1 /** 2 * Your object will be instantiated and called as such: 3 * ShapeFactory sf = new ShapeFactory(); 4 * Shape shape = sf.getShape(shapeType); 5 * shape.draw(); 6 */ 7 interface Shape { 8 void draw(); 9 } 10 11 class Rectangle implements Shape { 12 public void draw() { 13 System.out.println(" ----"); 14 System.out.println("| |"); 15 System.out.println(" ----"); 16 } 17 } 18 19 class Square implements Shape { 20 public void draw() { 21 System.out.println(" ----"); 22 System.out.println("| |"); 23 System.out.println("| |"); 24 System.out.println(" ----"); 25 } 26 } 27 28 class Triangle implements Shape { 29 public void draw() { 30 System.out.println(" /\\"); 31 System.out.println(" / \\"); 32 System.out.println("/____\\"); 33 } 34 } 35 36 public class ShapeFactory { 37 /** 38 * @param shapeType a string 39 * @return Get object of type Shape 40 */ 41 public Shape getShape(String shapeType) { 42 if (shapeType.toLowerCase().equals("square")) { 43 return new Square(); 44 } else if (shapeType.toLowerCase().equals("triangle")) { 45 return new Triangle(); 46 } else if (shapeType.toLowerCase().equals("rectangle")) { 47 return new Rectangle(); 48 } else { 49 return null; 50 } 51 } 52 }
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原文地址：http://www.cnblogs.com/beiyeqingteng/p/5662231.html
