java中的类卸载
当类加载器被垃圾收集时,它所加载的类是否被卸载? 当JVM以详细模式运行时,所有加载的类都是o/p。类似地,JVM在卸载类时会记录日志吗 我编写了一个自定义类加载器来测试这一点,但无法看到任何用于卸载类的详细日志java中的类卸载,java,garbage-collection,classloader,Java,Garbage Collection,Classloader,当类加载器被垃圾收集时,它所加载的类是否被卸载? 当JVM以详细模式运行时,所有加载的类都是o/p。类似地,JVM在卸载类时会记录日志吗 我编写了一个自定义类加载器来测试这一点,但无法看到任何用于卸载类的详细日志 CustomClassLoader loader = new CustomClassLoader(new URL[]{}, CustomClassLoader.class.getClassLoader()); loader.addURL("D:\\workspace\\Clas
CustomClassLoader loader = new CustomClassLoader(new URL[]{}, CustomClassLoader.class.getClassLoader());
loader.addURL("D:\\workspace\\ClassLoaderTest\\implementation.jar");
Class c = null;
try {
c = Class.forName("Horse",false,loader);
if (c != null) {
try {
Animal animal = (Animal)c.newInstance();
animal.eat();
}
catch(Exception ex) {
ex.printStackTrace();
}
}
}
catch(Exception e) {
e.printStackTrace();
}
c = null;
loader = null;
byte[] b = new byte[58*1024*1024];
System.gc();
ClassLoadingMXBean clBean = ManagementFactory.getClassLoadingMXBean();
System.out.println("Number of classes currently loaded " + clBean.getLoadedClassCount());
System.out.println("Number of classes loaded totally " + clBean.getTotalLoadedClassCount());
System.out.println("Number of classes unloaded " + clBean.getUnloadedClassCount());
即使ClassLoadingMXBean也给出了0个卸载的类
当类加载器是GCed时,我怎么知道类被卸载了呢?当为类加载器创建的任何类都是“活动的”时,类加载器不会被垃圾收集,部分原因是您可以向类请求其类加载器