lintcode：形状工厂

ShapeFactory

ShapeFactory sf = new ShapeFactory();
Shape shape = sf.getShape("Square");
shape.draw();
>>  ----
>> |    |
>> |    |
>>  ----

shape = sf.getShape("Triangle");
shape.draw();
>>   /\
>>  /  \
>> /____\

shape = sf.getShape("Rectangle");
shape.draw();
>>  ----
>> |    |
>>  ----
解题
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;
}
}