loadClass:加载指定的java类protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { synchronized (getClassLoadingLock(name)) { // First, check if the class has already been loaded Class c = findLoadedClass(name); if (c == null) { long t0 = System.nano...
启动类加载器(Bootstrap ClassLoader),负责加载存放在$JAVA_HOME\jre\lib下,或被-Xbootclasspath参数指定的路径中的,并且能被虚拟机识别的类库(如rt.jar,所有的java.*开头的类均被Bootstrap ClassLoader加载)。启动类加载器是无法被Java程序直接引用的。 扩展类加载器(Extension ClassLoader),该加载器由sun.misc....
整个java虚拟机的类加载层次关系如上图所示，启动类加载器(Bootstrap Classloader)负责将<JAVA_HOME>/li...
在 Java 中,类加载是将类的字节码从磁盘加载到内存中的过程。这个过程是 JVM 运行时的一部分,它负责加载、连接和初始化类。2. 类加载的阶段类加载分为三个主要阶段:2.1. 加载(Loading)加载阶段是将类的字节码从磁盘读取到内存的过程。类加载器负责查找类文件,并将其转换为 JVM 内部的数据结构。这些数据结构...
>loadClass(String name,boolean resolve)throws ClassNotFoundException{synchronized(getClassLoadingLock(name)){// First, check if the class has already been loadedClass<?>c=findLoadedClass(name);if(c==null){long t0=System.nanoTime();try{if(parent!=null){c=parent.loadClass(name,false);}else...
java核心类都是BootstrapClassLoader加载的, 保证了java的安全与稳定性ClassLoader的loadClass方法:// 传入类名称 和 是否解析标签 protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { // 对名称加锁 synchronized (getClassLoadingLock(name)) { // First, check if the...
synchronized (getClassLoadingLock(name)) { // First, check if the class has already been loaded Class> c = findLoadedClass(name); if (c == null) { long t0 = System.nanoTime(); try { if (parent != null) { c = parent.loadhttp://Class(name, false); ...
我们可以尝试查看java.lang.ClassLoader的源代码来理解loadClass()内部的工作细节 protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { synchronized (getClassLoadingLock(name)) { // First, check if the class has already been loaded Class<?> c = findLoadedClass(...
1 invokespecial #1 <java/lang/Object. : ()V> 4 return` 这是JVM的指令集,要去规范文档中查询所代表的意思。 1、aload_0代表本地变量保存在内存中栈帧第0项,默认是this(下面内存的部分会学习),字节码是0x2a,如果细心的话可以在图1-3-A②的字节码中找到。
Class Loading on the Java 2 Platform When you use the JNDI with the Java 2 platform, the class loader that loads the JNDI classes typically differs from the one that loads in the application. For example, in theJava 2 SDK, v1.3, the JNDI classes are loaded by the bootstrap class loade...