工厂模式

public interface Fruit {
    public void eat();
}

public class Apple implements Fruit {

    @Override
    public void eat() {
        System.out.println("吃苹果");
    }
}

public class Orange implements Fruit {

    @Override
    public void eat() {
        System.out.println("吃橙子....");
    }
}

public class MyFactory {
    public static Fruit getInstance(String name) {
        if(name.equals("Apple")) {
            return new Apple();
        }else if(name.equals("Orange")) {
            return new Orange();
        }else {
        return null;
        }
    }
}

public class Test {

    public static void main(String[] args) {
        
        /*Fruit f = new Orange();
        f.eat();*/
        
        
        Scanner input = new Scanner(System.in);
        System.out.println("请输入您要吃的水果名：");
        String name = input.next();
        
        Fruit f = MyFactory.getInstance(name);
        f.eat();
        
    }
}