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工作中遇到的设计模式整理

news 来源：原创 2025/5/25 21:52:39

单例模式：

public class Singleton {
    public static Singleton instance;
    private Singleton(){

    }
    public static Singleton getInstance() {
        if(instance==null){
            synchronized (Singleton.class){
                if(instance==null){
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    instance=new Singleton();
                }
            }
        }
        return instance;
    }
}

工厂模式：

interface Shape{
	void draw();
}
class Rectangle implements Shape{
	@Override
	public void draw(){
	    System.out.println("Inside Rectangle::draw() method.");
    }
}
class Circleimplements Shape{
	@Override
	public void draw(){
	    System.out.println("Inside Rectangle::draw() method.");
    }
}
class ShapeFactory(){
	Public Shape getShape(String shapeType){
	    if(shapeType==null){
	        return null;
        }
        if(shapeType.equals(“circle”)){
	        return new Circle();
        }else if(shapeType.equals(“rectangle”)){
	        return new Rectangle();
        }
        return null;
    }
}