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重拾起java

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#1 Created at ... [Delete] [Delete and Lock User]

因工作需要，重新开始拾起JAVA，计划每天抽出30min-1h来学习，周末两天看java项目源码

1.第一天，复习定义

JDK=JRE+compiler,debugger 等工具

JDK 是java 从源码编译，到运行所需要的工具集

JRE=JVM+Runtime library

JRE 是java 再虚拟机运行的所需要用到的工具集

JSR:java specification request 

JSR 是java 接口的定义

JCP:java community process

JCP是审核JSR的团体

〃卟虛偽

#2 Created at ... [Delete] [Delete and Lock User]

JVM是啥 你咋不写

🌙

#3 Created at ... [Delete] [Delete and Lock User]

没用，第n次来看了，还是记不住，当然，jdk，jre,jvm还是知道的

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#4 Created at ... [Delete] [Delete and Lock User]

jvm：java虚拟机；
java源文件(Xxx.java)通过编译后,变成字节码文件(Xxx.class)，然后可以在java虚拟机中运行。

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