bootstrap class loader

ObjectiveJava reflection, the most commonly used Class.forName () method. At completion, the code string is received and the code string is generated by Javacompiler (stored in the bin directory in the Eclipse Project, under Classpath), and then through the Java reflection mechanism, the main method is obtained and executed. The class file name is fixed. When the A.class file is updated, the problem occurs, and the result of the execution of the main

Basic concepts of Class Loaders:As the name implies, the ClassLoader (class loader) is used to dynamically load Java classes into a Java virtual machine. This means that when a program needs a class, the ClassLoader adds two of that class to the virtual machine.The tree-like

loaded in this way,Class is not initialized (that is, Initialization is delayed to be used). However, we can also learn from the above experience to loadThen instantiate an object class cc = classloader. getsystemclassloader (). loadclass ("C"). newinstance ().The system class loader is used here, which is also the mo

execute (the class that contains the main method), and the virtual machines initialize the class first Passive referencing (does not trigger class initializationuse): 1. Referencing a static field of a parent class through a subclass 2. Referencing a class by defining an ar

System class LoaderThe system loader may be familiar with the ears, but in order to complete the point, let's simply say the system's ClassLoader.public class Test {public static void main (string[] args) {ClassLoader CL1 = Test.class.getClassLoader (). GetParent (). Getp Arent (); System.out.println (CL1); ClassLoader Cl2 = Test.class.getClassLoader (). GetParen

symbolic reference in a class's binary data with a direct reference. 3, initialization: The class of static variables, static initialization block initialization. (Note: A final type of static property that, if the property value has been obtained at compile time, does not cause the class to be initialized when it is invoked, as this is equivalent to using a constant; Using the ClassLoader () method, on

Java differs from other languages in that Java is run in Java Virtual Machines (JVMS). This means that the compiled code isA platform-independent format that is saved instead of running on a particular machine. This format and the traditional canThere are many important differences in the execution of code formats. Specifically, unlike a C or C + + program, Java programs are not a singleThe executable file is made up of a number of separate class file

, you can use three class loaders: bootstarp class loaders, extensions class loaders, and application class loaders. Bootstrap loader: only responsible for loading the core Java library, such Vm. jar and core. jar in the/jre

Parental delegation mechanisms and the problem with class loadersIn general the case. Ensure that other classes that are associated with the same class are loaded by the class loader of the current class.For example, Class A itself is found under ext. Then some of his new ou