关于jdk和java规范

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Oracle Jdk 下载地址

https://www.oracle.com/technetwork/java/javase/archive-139210.html

mac环境下安装oracle jdk后的安装地址如下：

/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home
/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home
/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home
/Library/Java/JavaVirtualMachines/jdk-9.0.4.jdk/Contents/Home
/Library/Java/JavaVirtualMachines/jdk-10.0.2.jdk/Contents/Home
/Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home

配置：

cd ~

vim .bash_profile

ORACLE_JAVA_7_HOME="/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home"
ORACLE_JAVA_8_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home"
ORACLE_JAVA_9_HOME="/Library/Java/JavaVirtualMachines/jdk-9.0.4.jdk/Contents/Home"
ORACLE_JAVA_10_HOME="/Library/Java/JavaVirtualMachines/jdk-10.0.2.jdk/Contents/Home"
ORACLE_JAVA_11_HOME="/Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home"

JAVA_HOME=ORACLE_JAVA_8_HOME
CLASS_PATH="$JAVA_HOME/lib"
PATH=$PATH:$JAVA_HOME/bin

#文件加载顺序
#/etc/profile >> /etc/paths >> ~/.bash_profile >> ~/.bash_login >> ~/.profile >> ~/.bashrc

ll /usr/bin/java
lrwxr-xr-x 1 root wheel 74B 10 20 12:07 /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java

openjdk 下载地址

https://jdk.java.net/11/
https://jdk.java.net/12/

JEP java增强提案

http://openjdk.java.net/jeps/0

openjdk8

http://openjdk.java.net/projects/jdk8/

openjdk 10+

http://openjdk.java.net/projects/jdk/10/
http://openjdk.java.net/projects/jdk/11/
http://openjdk.java.net/projects/jdk/12/

oracle java 文档

https://www.oracle.com/technetwork/cn/java/javase/overview/index.html

https://www.oracle.com/technetwork/cn/java/javase/tech/index.html

https://www.oracle.com/technetwork/java/javaee/tech/java-ee-8-3890673.html?ssSourceSiteId=otncn

java 规范

https://docs.oracle.com/javase/specs/

• java8

https://docs.oracle.com/javase/specs/jvms/se8/html/index.html

• java11

https://docs.oracle.com/javase/specs/jvms/se11/html/index.html