标签：public 逻辑 blog == rri return stat use 工厂模式
在工厂模式中，我们创建对象而不将创建逻辑暴露给客户端。
首先，我们设计一个接口来表示Shape。
public interface Shape {
void draw();
}
然后我们创建实现接口的具体类。
public class Rectangle implements Shape {
@Override
public void draw() {
System.out.println("Inside Rectangle::draw() method.");
}
}
public class Square implements Shape {
@Override
public void draw() {
System.out.println("Inside Square::draw() method.");
}
}
public class Circle implements Shape {
@Override
public void draw() {
System.out.println("Inside Circle::draw() method.");
}
}
核心工厂模式是一个Factory类。以下代码显示了如何为Shape对象创建Factory类。
ShapeFactory类基于传递给getShape（）方法的String值创建Shape对象。如果String值为CIRCLE，它将创建一个Circle对象。
public class ShapeFactory {
//use getShape method to get object of type shape
public Shape getShape(String shapeType){
if(shapeType == null){
return null;
}
if(shapeType.equalsIgnoreCase("CIRCLE")){
return new Circle();
} else if(shapeType.equalsIgnoreCase("RECTANGLE")){
return new Rectangle();
} else if(shapeType.equalsIgnoreCase("SQUARE")){
return new Square();
}
return null;
}
}
以下代码具有main方法，并且它使用Factory类通过传递类型等信息来获取具体类的对象。
public class Main {
public static void main(String[] args) {
ShapeFactory shapeFactory = new ShapeFactory();
//get an object of Circle and call its draw method.
Shape shape1 = shapeFactory.getShape("CIRCLE");
//call draw method of Circle
shape1.draw();
//get an object of Rectangle and call its draw method.
Shape shape2 = shapeFactory.getShape("RECTANGLE");
//call draw method of Rectangle
shape2.draw();
//get an object of Square and call its draw method.
Shape shape3 = shapeFactory.getShape("SQUARE");
//call draw method of circle
shape3.draw();
}
}
标签：public 逻辑 blog == rri return stat use 工厂模式
原文地址：http://www.cnblogs.com/echo-ling/p/7475950.html
