工厂模式

public abstract class Product{
    public void method1(){
        ...
    }
    
    public abstract void method2();
}

public class ConcreteProduct1 extends Product{
    public void method2(){
        ....
    }
}

public class ConcreteProduct2 extends Product{
    public void method2(){
        ....
    }
}

public abstract class Creator{
    public abstract < T extends Product> T createProduct(Class<T> c);
}

public class ConcreteCreator extends Creator{
    public < T extends Product> T createProduct(Class<T> c){
        Product product=null;
        try{
            product=(Product)Class.forName(c.getName()).newInstance();
        }catch{
            ....
        }
        return (T)product;
    }
}

public class Client{
    public static void main(String[] args){
        Creator creator=new ConcreteCreator();
        Product product=creator.createProduct(ConcreteProduct1.class);
    }
}