工厂方法

abstract class SuperClass
{
    public abstract Person getPerson();
}
class Sub1Class
{
    public  Person getPerson()
    {
        return new Student();
    }
}
class Sub2Class
{
    public  Person getPerson()
    {
        return new Worker();
    }
}
interface Person
{
    
}

class Student implements Person
{
    
}
class Worker implements Person
{
    
}