设计模式 | 外观模式/门面模式（facade）

package designpattern.facade;

public class HandleTrouble {
    public void call110(String trouble) {
        System.out.println(trouble);
        // 模拟接警员处理来电
        if (trouble.indexOf("抢劫") > 0 || trouble.indexOf("杀人") > 0) {
            CriminalPolice criminalPolice = new CriminalPolice();
            criminalPolice.handleIt();
        } else if (trouble.indexOf("追尾") > 0 || trouble.indexOf("撞车") > 0) {
            TrafficPolice trafficPolice = new TrafficPolice();
            trafficPolice.handleIt();
        } else if (trouble.indexOf("起火") > 0 || trouble.indexOf("烧起来") > 0) {
            System.out.println("转接火警...");
            FirePolice firePolice = new FirePolice();
            firePolice.handleIt();
        } else {
            PeoplePolice peoplePolice = new PeoplePolice();
            peoplePolice.handleIt();
        }
    }
}

package designpattern.facade;

public class CriminalPolice {
    public void handleIt() {
        System.out.println("刑警出动...");
    }
}

package designpattern.facade;

public class TrafficPolice {
    public void handleIt() {
        System.out.println("交警出动...");
    }
}

package designpattern.facade;

public class FirePolice {
    public void handleIt() {
        System.out.println("火警出动...");
    }
}

package designpattern.facade;

public class PeoplePolice {
    public void handleIt() {
        System.out.println("民警出动...");
    }
}

package designpattern.facade;

public class Client {
    public static void main(String[] args) {
        HandleTrouble handleTrouble = new HandleTrouble();
        handleTrouble.call110("救命啊，杀人啦，快来人啊~~~~~");
        System.out.println("-------------------");
        handleTrouble.call110("XX大楼起火了");
        System.out.println("-------------------");
        handleTrouble.call110("有人打架了，快来人");
        System.out.println("-------------------");
    }
}

救命啊，杀人啦，快来人啊~~~~~
刑警出动...
-------------------
XX大楼起火了
转接火警...
火警出动...
-------------------
有人打架了，快来人
民警出动...
-------------------