简单工厂模式

最新推荐文章于 2025-05-26 21:02:41 发布

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把对象的实例化工作延迟到工厂类中进行

import java.util.*;

abstract class Operation {
    public abstract void Operate();    
}

class Operation1 extends Operation {
    public void Operate() {
        System.out.println("Class Operation1 -- operate");
    }
}

class Operation2 extends Operation {
    public void Operate() {
        System.out.println("Class Operation2 -- operate");
    }
}

class Operation3 extends Operation {
    public void Operate() {
        System.out.println("Class Operation3 -- operate");
    }
}

public class SimpleFactory {
    public static Operation newOperation(String OperationType) {
        Operation instance = null;
        switch (OperationType) {
            case "1": 
                instance = new Operation1();
                break;
            case "2":
                instance = new Operation2();
                break;
            case "3":
                instance = new Operation3();
                break;
        }
        return instance;
    }

    public static void main(String[] args) {
        Operation obj1 = SimpleFactory.newOperation("1");
        obj1.Operate();
        Operation obj2 = SimpleFactory.newOperation("2");
        obj2.Operate();
        Operation obj3 = SimpleFactory.newOperation("3");
        obj3.Operate();
    }
}