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 ); } @Override public void printParen() { showWithParen(); } @Override public 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; } @Override public void printParen() { banner.showWithParen(); } @Override public 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
引用该文档请注明出处