设计模式——适配器模式

适配器模式也叫做包装模式；就是把内部结构包装（适配）成用户期待的格式，使得可以兼容使用

通过继承方式使用适配器模式

/**
 * @author maikec
 * @date 2019/5/9 */public interface Print {/** * 打印带括号的消息     */void printParen();/** * 打印带*号的消息     */void printAster();
}/**
 * 实际使用中的类
 * @author maikec
 * @date 2019/5/9 */public class Banner {private final String msg;public Banner(String msg){this.msg = msg;
    }public void showWithParen(){
        System.out.println( "(" + msg + ")" );
    }public void showWithAster(){
        System.out.println( "*" + msg + "*" );
    }
}/**
 * @author maikec
 * @date 2019/5/9 */public class PrintBannerAdapter extends Banner implements Print {public PrintBannerAdapter(String msg) {super( msg );
    }

    @Overridepublic void printParen() {
        showWithParen();
    }

    @Overridepublic void printAster() {
        showWithAster();
    }
}/**
 * @author maikec
 * @date 2019/5/9 */public class AdapterExtendDemo {public static void main(String[] args) {
        Print print = new PrintBannerAdapter( "hello adapter" );
        print.printAster(  );
        print.printParen();
    }
}

通过引用使用适配器模式

/**
 * 需求
 * @author maikec
 * @date 2019/5/9 */public abstract class Print {/** * 打印带括号的消息     */public abstract void printParen();/** * 打印带*号的消息     */public abstract void printAster();public void i(){

    }
}/**
 * 实际使用中的类
 * @author maikec
 * @date 2019/5/9 */public class Banner {private final String msg;public Banner(String msg){this.msg = msg;
    }public void showWithParen(){
        System.out.println( "(" + msg + ")" );
    }public void showWithAster(){
        System.out.println( "*" + msg + "*" );
    }
}/**
 * @author maikec
 * @date 2019/5/9 */public class PrintBannerAdapter extends Print {private Banner banner;public PrintBannerAdapter(Banner banner){this.banner = banner;
    }
    @Overridepublic void printParen() {
        banner.showWithParen();
    }

    @Overridepublic void printAster() {
        banner.showWithAster();
    }
}/**
 * @author maikec
 * @date 2019/5/9 */public class AdapterReferenceDemo {public static void main(String[] args) {
        Print print = new PrintBannerAdapter( new Banner( "Hello Adapter" ) );
        print.printAster();
        print.printParen();
    }
}

附录

zh.wikipedia.org/wiki/适配器模式 维基关于适配器模式
github.com/maikec/patt… 个人GitHub设计模式案例

声明

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