Java中原型模式代码示例
时间: 2023-12-24 12:03:20 浏览: 38
好的,以下是Java中的原型模式代码示例:
```
public abstract class Shape implements Cloneable {
private String id;
protected String type;
abstract void draw();
public String getType(){
return type;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Object clone() {
Object clone = null;
try {
clone = super.clone();
} catch (CloneNotSupportedException e) {
e.printStackTrace();
}
return clone;
}
}
public class Rectangle extends Shape {
public Rectangle(){
type = "Rectangle";
}
@Override
public void draw() {
System.out.println("Inside Rectangle::draw() method.");
}
}
public class Square extends Shape {
public Square(){
type = "Square";
}
@Override
public void draw() {
System.out.println("Inside Square::draw() method.");
}
}
public class Circle extends Shape {
public Circle(){
type = "Circle";
}
@Override
public void draw() {
System.out.println("Inside Circle::draw() method.");
}
}
public class ShapeCache {
private static Hashtable<String, Shape> shapeMap = new Hashtable<String, Shape>();
public static Shape getShape(String shapeId) {
Shape cachedShape = shapeMap.get(shapeId);
return (Shape) cachedShape.clone();
}
public static void loadCache() {
Circle circle = new Circle();
circle.setId("1");
shapeMap.put(circle.getId(),circle);
Square square = new Square();
square.setId("2");
shapeMap.put(square.getId(),square);
Rectangle rectangle = new Rectangle();
rectangle.setId("3");
shapeMap.put(rectangle.getId(),rectangle);
}
}
public class PrototypePatternDemo {
public static void main(String[] args) {
ShapeCache.loadCache();
Shape clonedShape = (Shape) ShapeCache.getShape("1");
System.out.println("Shape : " + clonedShape.getType());
Shape clonedShape2 = (Shape) ShapeCache.getShape("2");
System.out.println("Shape : " + clonedShape2.getType());
Shape clonedShape3 = (Shape) ShapeCache.getShape("3");
System.out.println("Shape : " + clonedShape3.getType());
}
}
```
这里定义了三种形状类:圆形、矩形和正方形,并且一个静态类ShapeCache用于缓存这些形状类的实例。每个形状类都实现了Cloneable接口,从而可以通过clone()方法来创建它们自己的副本,这是原型模式的关键点。而客户端则可以通过ShapeCache来获取这些形状的副本,而不必再去创建它们自己的实例。
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