JVM class loading (I)

JVM（ One ）

JVM Class loading

This mainly records the process of class loading .

Java The composition of virtual machine

Java The virtual machine is divided into four parts

• Class loader
• Run time data area
• Execution engine
• Local method interface

java Characteristics of

A compilation , Run anywhere . This characteristic is based on Java The intermediary function of virtual machine is realized by shielding the difference of the underlying operating system

Class loader

The class loader is responsible for loading all classes , Generate a for the loaded class java.lang.Class Instance object .
Aforementioned Class loading The process is all done by the class loader .

form

System level class loader

• Start class loader
• Extend the classloader
• system class loader

User level class loader

• Custom class loaders

technological process

stay JVM Startup time ÿ