设计模式之桥(bridge)

将抽象部分与它的实现部分分离，使之都可以独立的变化。

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AbstractLogImpl 与 AbstractLog即构成日志与平台之间的桥梁，实现日志与平台的多种组合。public class Bridge {// 日志abstract class AbstractLog {protected AbstractLogImpl abstractLogImpl;public void setAbstractLogImpl(AbstractLogImpl abstractLogImpl) {this.abstractLogImpl = abstractLogImpl;}public abstract void printLog();}class DbLog extends AbstractLog {public void printLog() {abstractLogImpl.runPlatform();System.out.println("dabase log...");}}class FileLog extends AbstractLog {public void printLog() {abstractLogImpl.runPlatform();System.out.println("file log...");}}// 平台abstract class AbstractLogImpl {abstract void runPlatform();}class Windows extends AbstractLogImpl {public void runPlatform() {System.out.println("run in windows");}}class Linux extends AbstractLogImpl {public void runPlatform() {System.out.println("run in linux");}}public static void main(String[] args){Bridge bridge = new Bridge();AbstractLog al = bridge.new DbLog();AbstractLogImpl ali = bridge.new Windows();al.setAbstractLogImpl(ali);//平台与日志组合windows与dblog al.printLog();}}