{"id":1128,"date":"2023-03-16T21:27:37","date_gmt":"2023-03-16T13:27:37","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=1128"},"modified":"2023-04-29T10:01:48","modified_gmt":"2023-04-29T02:01:48","slug":"design-pattern-composite-pattern","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/03\/16\/design-pattern-composite-pattern\/","title":{"rendered":"\u8bbe\u8ba1\u6a21\u5f0f\uff0819\uff09\u7ec4\u5408\u6a21\u5f0f"},"content":{"rendered":"

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\u5b9a\u4e49<\/h2>\n

<\/p>\n

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public abstract class Dir {\n    \/**\n     * \u58f0\u660e\u4e00\u4e2aList\u6210\u5458\u53d8\u91cf\u6765\u50a8\u5b58\u6587\u4ef6\u5939\u4e0b\u7684\u6240\u6709\u5143\u7d20\n     *\/\n    protected List<Dir> dirs = new ArrayList<Dir>();\n\n    private String name; \/\/\u5f53\u524d\u6587\u4ef6\u6216\u6587\u4ef6\u5939\u540d\n\n    public Dir(String name) {\n        this.name = name;\n    }\n\n    \/**\n     * \u6dfb\u52a0\u4e00\u4e2a\u6587\u4ef6\u6216\u6587\u4ef6\u5939\n     * \n     * @param dir \u6587\u4ef6\u6216\u6587\u4ef6\u5939\n     *\/\n    public abstract void addDir(Dir dir);\n\n    \/**\n     * \u79fb\u9664\u4e00\u4e2a\u6587\u4ef6\u6216\u6587\u4ef6\u5939\n     * \n     * @param dir \u6587\u4ef6\u6216\u6587\u4ef6\u5939\n     *\/\n    public abstract void rmDir(Dir dir);\n\n    \/**\n     * \u6e05\u7a7a\u6587\u4ef6\u5939\u4e0b\u6240\u6709\u5143\u7d20\n     *\/\n    public abstract void clear();\n\n    \/**\n     * \u8f93\u51fa\u6587\u4ef6\u5939\u76ee\u5f55\u7ed3\u6784\n     *\/\n    public abstract void print();\n\n    \/**\n     * \u83b7\u53d6\u6587\u4ef6\u5939\u4e0b\u6240\u6709\u7684\u6587\u4ef6\u6216\u6587\u4ef6\u5939\n     * \n     * @return \u6587\u4ef6\u5939\u4e0b\u6240\u6709\u7684\u6587\u4ef6\u6216\u6587\u4ef6\u5939\n     *\/\n    public abstract List<Dir> getFiles();\n\n    \/**\n     * \u83b7\u53d6\u6587\u4ef6\u6216\u6587\u4ef6\u5939\u540d\n     * \n     * @return \u6587\u4ef6\u6216\u6587\u4ef6\u5939\u540d\n     *\/\n    public String getName(){\n        return name;\n    }\n}<\/code><\/pre>\n
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public class Folder extends Dir {\n\n    public Folder(String name) {\n        super(name);\n    }\n\n    @Override\n    public void addDir(Dir dir) {\n        dirs.add(dir);\n    }\n\n    @Override\n    public void rmDir(Dir dir) {\n        dirs.remove(dir);\n    }\n\n    @Override\n    public void clear() {\n        dirs.clear();\n    }\n\n    @Override\n    public void print() {\n        System.out.print(getName() + "(");\n        Iterator<Dir> iter = dirs.iterator();\n        while (iter.hasNext()) {\n            Dir dir = iter.next();\n            dir.print();\n            if(iter.hasNext()){\n                System.out.print(", ");\n            }\n        }\n        System.out.print(")");\n    }\n\n    @Override\n    public List<Dir> getFiles() {\n        return dirs;\n    }\n\n}<\/code><\/pre>\n
\u8868\u793a\u6587\u4ef6\u5939\u7684\u7c7b\uff1a\uff08Leaf\uff09<\/p>\n
public class File extends Dir{\n\n    public File(String name) {\n        super(name);\n    }\n\n    @Override\n    public void addDir(Dir dir) {\n        throw new UnsupportedOperationException("\u6587\u4ef6\u5bf9\u8c61\u4e0d\u652f\u6301\u8be5\u64cd\u4f5c\uff01");\n    }\n\n    @Override\n    public void rmDir(Dir dir) {\n        throw new UnsupportedOperationException("\u6587\u4ef6\u5bf9\u8c61\u4e0d\u652f\u6301\u8be5\u64cd\u4f5c\uff01");\n    }\n\n    @Override\n    public void clear() {\n        throw new UnsupportedOperationException("\u6587\u4ef6\u5bf9\u8c61\u4e0d\u652f\u6301\u8be5\u64cd\u4f5c\uff01");\n    }\n\n    @Override\n    public void print() {\n        System.out.print(getName());\n    }\n\n    @Override\n    public List<Dir> getFiles() {\n        throw new UnsupportedOperationException("\u6587\u4ef6\u5bf9\u8c61\u4e0d\u652f\u6301\u8be5\u64cd\u4f5c\uff01");\n    }\n\n}<\/code><\/pre>\n
\u5ba2\u6237\u7c7b\uff1a<\/p>\n
public class Client {\n    public static void main(String[] args) {\n        \/\/\u6784\u9020\u4e00\u4e2a\u76ee\u5f55\u5bf9\u8c61\u8868\u793aC\u76d8\u6839\u76ee\u5f55\n        Dir diskC = new Folder("C");\n\n        \/\/C\u76d8\u6839\u76ee\u5f55\u4e0b\u6709\u4e00\u4e2a\u6587\u4ef6Log.txt\n        diskC.addDir(new File("Log.txt"));\n\n        \/\/C\u76d8\u6839\u76ee\u5f55\u4e0b\u6709\u4e09\u4e2a\u76ee\u5f55Windows\u3001PerfLogs\u3001Program File\n        Dir dirWin = new Folder("Windows");\n\n        \/\/Windows\u76ee\u5f55\u4e0b\u6709\u6587\u4ef6explorer.exe\n        dirWin.addDir(new File("explorer.exe"));\n        diskC.addDir(dirWin);\n\n        \/\/PerfLogs\u76ee\u5f55\n        Dir dirPer = new Folder("PerfLogs");\n\n        \/\/PerfLogs\u76ee\u5f55\u4e0b\u6709\u6587\u4ef6null.txt\n        dirPer.addDir(new File("null.txt"));\n        diskC.addDir(dirPer);\n\n        \/\/Program File\u76ee\u5f55\n        Dir dirPro = new Folder("Program File");\n\n        \/\/Program File\u76ee\u5f55\u4e0b\u6709\u6587\u4ef6ftp.txt\n        dirPro.addDir(new File("ftp.txt"));\n        diskC.addDir(dirPro);\n\n        \/\/\u6253\u5370\u51fa\u6587\u4ef6\u7ed3\u6784\n        diskC.print();\n    }\n}<\/code><\/pre>\n
\u7ed3\u679c\uff1a<\/p>\n
C(Log.txt, Windows(explorer.exe), PerfLogs(null.txt), Program File(ftp.txt))<\/code><\/pre>\n
Android\u6e90\u7801\u4e2d\u7684\u6a21\u5f0f\u5b9e\u73b0<\/h2>\n
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