各个版本JDK下载地址
JDK 8 http://download.java.net/openjdk/jdk8/
JDK 7 http://download.java.net/openjdk/jdk7/
JDK 6 http://download.java.net/openjdk/jdk6/
Debian
安装 OpenJDK 的源码包(以OpenJDK 8为例):
apt-get install openjdk-8-source
安装后的目录位于:/usr/lib/jvm/java-8-openjdk-amd64/src.zip