lintcode：形狀工廠

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題目

原廠模式是一種常見的設計模式。實現一個形狀工廠 ShapeFactory 來建立不同的形狀類。這裡我們假設只有三角形，正方形和矩形三種形狀。

範例

ShapeFactory sf = new ShapeFactory();Shape shape = sf.getShape("Square");shape.draw();>>  ---->> |    |>> |    |>>  ----shape = sf.getShape("Triangle");shape.draw();>>   />>  /  >> /____shape = sf.getShape("Rectangle");shape.draw();>>  ---->> |    |>>  ----
解題
直接draw方法

/** * Your object will be instantiated and called as such: * ShapeFactory sf = new ShapeFactory(); * Shape shape = sf.getShape(shapeType); * shape.draw(); */interface Shape {    void draw();}class Rectangle implements Shape {    // Write your code here    public void draw(){        System.out.println(" ----");        System.out.println("|    |");        System.out.println(" ----");        }}class Square implements Shape {    // Write your code here    public void draw(){        System.out.println(" ----");        System.out.println("|    |");        System.out.println("|    |");        System.out.println(" ----");        }    }class Triangle implements Shape {    // Write your code here    public   void draw(){        System.out.println("  /\\");        System.out.println(" /  \\");        System.out.println("/____\\");      }}public class ShapeFactory {    /**     * @param shapeType a string     * @return Get object of type Shape     */    public Shape getShape(String shapeType) {        // Write your code here        if(shapeType.equals("Square")){            return new Square();        }        if(shapeType.equals("Rectangle")){            return new Rectangle();        }        if(shapeType.equals("Triangle")){            return new Triangle();        }        return null;    }}

 

lintcode：形狀工廠