Java设计模式,需要用到两种设计模式，急需！

工厂模式：
Product代码：
public interface Work {
void doWork();
}

ConcreteProduct代码：
public class StudentWork implements Work {
public void doWork() {
System.out.println("学生做作业!");
}
}

public class TeacherWork implements Work {
public void doWork() {
System.out.println("老师审批作业!");
}
}

Creator代码：
public interface IWorkFactory {
Work getWork();
}

ConcreteCreator代码：
public class StudentWorkFactory implements IWorkFactory {
public Work getWork() {
return new StudentWork();
}
}

public class TeacherWorkFactory implements IWorkFactory {
public Work getWork() {
return new TeacherWork();
}
}

Test代码：
public class Test {
public static void main(String[] args) {
IWorkFactory studentWorkFactory = new StudentWorkFactory();
studentWorkFactory.getWork().doWork();
IWorkFactory teacherWorkFactory = new TeacherWorkFactory();
teacherWorkFactory.getWork().doWork();
}
}

追问一下，给你写第二个。

设计的模式,需求,我理解,良种方式
可以写

单例 和 工厂