接口之工厂方法的设计模式

1 定义一个用于创建对象的接口,让子类决定实例化哪一个类,FactoryMethod使一个类的实例化延迟到子类

package p1;

public class TestFactory {

    public static void main(String[] args) {
        IWorkFactory i = new TeacherWorkFactory();
        i.getWork().doWork();     //Teacher is working

        IWorkFactory i2 = new StudentWorkFactory();
        i2.getWork().doWork();    //Student is working
    }

}

interface IWorkFactory {
    public abstract Work getWork();
}

class TeacherWorkFactory implements IWorkFactory {

    @Override
    public Work getWork() {
        return new TeacherWork();
    }
}

class StudentWorkFactory implements IWorkFactory {

    @Override
    public Work getWork() {
        return new StudentWork();
    }
}

interface Work {
    public abstract void doWork();
}

class TeacherWork implements Work {
    public void doWork() {
        System.out.println("Teacher is working");
    }
}

class StudentWork implements Work {
    public void doWork() {
        System.out.println("Student is working");
    }
}