设计模式系列之原型模式

迷南。 2023-01-23 13:58 17阅读 0赞

1、创建抽象类

public abstract class Shape {
      private String id;
    
      public String getId() {
        return id;
      }
    
      public void setId(String id) {
        this.id = id;
      }
    
      protected String type;
    
      private String name;
    
      public abstract void draw();
    }

2、创建实现

public class Circle extends Shape {
      public Circle() {
        this.type = "circle";
      }
    
      @Override
      public void draw() {
        System.out.println("circle draw");
      }
    }

public class Rectangle extends Shape {
      public Rectangle() {
        this.type = "rectangle";
      }
    
      @Override
      public void draw() {
        System.out.println("rectangle draw");
      }
    }

public class Square extends Shape {
      public Square() {
        this.type = "square";
      }
    
      @Override
      public void draw() {
        System.out.println("square draw");
      }
    }

3、创建静态类

public class ShapeCache {
    
      private static HashMap<String, Shape> cache = new HashMap<>();
    
      public static Shape getShape(String id) {
        Shape shape = cache.get(id);
        return shape;
      }
    
    
      public static void loadCache() {
        Shape shape1 = new Circle();
        shape1.setId("1");
        cache.put(shape1.getId(), shape1);
    
        Shape shape2 = new Rectangle();
        shape2.setId("2");
        cache.put(shape2.getId(), shape2);
    
        Shape shape3 = new Square();
        shape3.setId("3");
        cache.put(shape3.getId(), shape3);
      }
    
    }

4、创建调用类

public class PrototypeDemo {
      public static void main(String[] args) {
        ShapeCache.loadCache();
        ShapeCache.getShape("1").draw();
        ShapeCache.getShape("2").draw();
        ShapeCache.getShape("3").draw();
      }
    }

5、结果截图

![20210715144533541.png][]

[20210715144533541.png]: /images/20221004/e5da2cb370124edf9993218354640201.png