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                ### ClassLoader ### 自定義類加載器:繼承抽象類ClassLoader并重寫findClass\(\)方法 ``` public Class<?> loadClass(String name) throws ClassNotFoundException { return loadClass(name, false); } protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { synchronized (getClassLoadingLock(name)) { // 查找該 class 是否已經被加載過 Class<?> c = findLoadedClass(name); // 如果沒有加載過 if (c == null) { // 委托給父加載器去加載,遞歸調用 if (parent != null) { c = parent.loadClass(name, false); } else { // 如果父加載器為空,查找 Bootstrap 是否加載過 c = findBootstrapClassOrNull(name); } // 若果依然加載不到,則調用自己的 findClass 去加載 if (c == null) { c = findClass(name); } } if (resolve) { resolveClass(c); } return c; } } protected Class<?> findClass(String name){ //1. 根據傳入的類名 name,到在特定目錄下去尋找類文件,把.class 文件讀入內存 ... //2. 調用 defineClass 將字節數組轉成 Class 對象 return defineClass(buf, off, len); } // 將字節碼數組解析成一個 Class 對象,用 native 方法實現 protected final Class<?> defineClass(byte[] b, int off, int len){ ... } ``` ####常用方法 #### ![](https://img.kancloud.cn/ad/1f/ad1faec49fd3158bda99197aa3ee9ce7_857x293.png)
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