JVM | introduction

JVM

effect

Java Virtual machine is the running environment of binary bytecode , Running on the operating system , No direct interaction with hardware . Responsible for loading bytecode into its interior , explain / Compile to execute machine instructions on the corresponding platform .

characteristic

• A compilation , Run anywhere
• Automatic memory management
• Automatic garbage collection function

Life cycle

start-up

Java The virtual machine is started by booting the class loader to create an initial class , This class is specified by the specific implementation of the virtual machine .

perform

Carry out a so-called Java When it comes to programming , What is really being implemented is a program called Java Process of virtual machine .

sign out

• The normal execution of the program ends
• The program encountered an exception or error during execution and terminated abnormally
• Caused by an error in the operating system Java Virtual machine process termination
• A thread calls Runtime Class or System Class exit Method , perhaps Runtime Class halt Method , And Java Security manager also allows this time exit or halt operation .