java几种简单设计模式

public class Singleton {

   private static Singleton singleton = new Singleton;    
    
   private Singleton() {}

   public static Singleton getInstance() {
        return singleton;
   }   
 
}

interface Car {
    public void run() ;
    public void stop();
}

class Benz implements Car {
    public void run() {
         System.out.println("Benz开始启动了----------------");
    }
    public void stop() {
         System.out.println("Benz停止了----------------");
    }  
}

class Ford implements Car {
    public void run() {
         System.out.println("Ford开始启动了----------------");
    }
    public void stop() {
         System.out.println("Ford停止了----------------");
    }  
}

class Factory {
    public static Car getCarInstance(String type) {
           Car car = null;
           try {
                car =(Car)Class.forName("package."+type).newInstance();
           } catch(Exception e) {
                e.printStackTrace();
           }
    }
}