答案及解析：[问答题]现欲构造一文件／目录树，采用组合（Composite）设计模式来设计，得到的类图如6-1所示：{图}图6-1类图【Java代码】import java.util.ArrayList;import.ja

问题：

[问答题] 现欲构造一文件／目录树，采用组合（Composite）设计模式来设计，得到的类图如6-1所示：{图}图6-1类图【Java代码】import java.util.ArrayList;import.java.util.List;(1)class AbstractFile{protected String name;public void printName（　　）{System.out.println(name);}public abstract boolean addChild(AbstractFile file);public abstract boolean removeChild(AbstracFile file);public abstract List＜AbstractFile>getChildren（　　）;}class File extends AbstractFile{public File(String name){this.name=name;}public?boolean addChild(AbstractFile file){return false;}public?boolean?removeChild(AbstracFile file){return false;}public?List＜AbstractFile>getChildren（　　）{return(2);}}class Folder extends AbstractFile{private List＜AbstracFile>childList;public Folder(String name){this.name=name;this.childList=new ArrayList＜AbstractFile>（　　）;}public boolean addChild(AbstractFile file){return childList.add(file);}public boolean removeChild(AbstractFile file){return childList.remove(file);}public(3)＜AbstractFile>getChildren（　　）{return(4);}}public class Client{public static void main(String[]args){//创造一个树形的文件/目录结构AbstractFile rootFolder=new Folder(“c:\\”);AbstractFile compositeFolder=new Folder(“composite”);AbstractFile windowsFolder=new Folder(“windows”);AbstractFile file=new File(“TestComposite.java”);rootFolder.addChild(compositeFolder);rootFolder.addChild(windowsFolder);compositeFolder.addChild(file);//打印目录文件数printTree（rootFolder）;}private static void printTree(AbstractFile ifile){ifile.printName（　　）;List＜AbstractFile>children=ifile.getChildren（　　）:if(Children==null)return;for(AbstractFile file:Children){(5);}}}该程序运行后输出结果为：c:\compositeTestComposite.javaWindows【Java代码】import java.util.ArrayList;import.java.util.List;(1)class AbstractFile{protected String name;public void printName（　　）{System.out.println(name);}public abstract boolean addChild(AbstractFile file);public abstract boolean removeChild(AbstracFile file);public abstract List＜AbstractFile>getChildren（　　）;}class File extends AbstractFile{public File(String name){this.name=name;}public?boolean addChild(AbstractFile file){return false;}public?boolean?removeChild(AbstracFile file){return false;}public?List＜AbstractFile>getChildren（　　）{return(2);}}class Folder extends AbstractFile{private List＜AbstracFile>childList;public Folder(String name){this.name=name;this.childList=new ArrayList＜AbstractFile>（　　）;}public boolean addChild(AbstractFile file){return childList.add(file);}public boolean removeChild(AbstractFile file){return childList.remove(file);}public(3)＜AbstractFile>getChildren（　　）{return(4);}}public class Client{public static void main(String[]args){//创造一个树形的文件/目录结构AbstractFile rootFolder=new Folder(“c:\\”);AbstractFile compositeFolder=new Folder(“composite”);AbstractFile windowsFolder=new Folder(“windows”);AbstractFile file=new File(“TestComposite.java”);rootFolder.addChild(compositeFolder);rootFolder.addChild(windowsFolder);compositeFolder.addChild(file);//打印目录文件数printTree（rootFolder）;}private static void printTree(AbstractFile ifile){ifile.printName（　　）;List＜AbstractFile>children=ifile.getChildren（　　）:if(Children==null)return;for(AbstractFile file:Children){(5);}}}该程序运行后输出结果为：c:\compositeTestComposite.javaWindows

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答案解析：

╋纠错

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