系统环境：win10
之前已经启用了linux bash环境
前置准备：本地下载好openjdk12，地址http://hg.openjdk.java.net/jdk/jdk12/file/06222165c35f
下载其实是可以看到本地~jdk12-06222165c35fdoc下有几个文件比如：building.html
里面有写步骤和一些环境需要的东西
步骤
Get the complete source code:
hg clone http://hg.openjdk.java.net/jdk/jdk
Run configure:
bash configure
If configure fails due to missing dependencies (to either the toolchain, build tools, external libraries or the boot JDK), most of the time it prints a suggestion on how to resolve the situation on your platform. Follow the instructions, and try running bash configure again.
Run make:
make images
Verify your newly built JDK:
./build/*/images/jdk/bin/java -version
Run basic tests:
make run-test-tier1
其实，进入当前目录，敲下bash，然后bash configure，它会提示你缺什么，然后你去下载就可以了，参考这个https://my.oschina.net/amhuman/blog/848508
其中我遇到了一个问题，就是请求的网址404，详见https://www.cnblogs.com/X-knight/p/10598076.html
我先试了第二种方法，也就是网络问题，很快就解决了。（文件的修改需要懂基本的linux文件读写）
然后它的编译还需要鸡生蛋，蛋生鸡，我就sudo apt-get install openjdk-11-jdk
接着按照官方提示make images，我先是make的（花了半小时），然后找不到在哪里java -version...，后来就make images（这时速度就很快了）
然后继续./build/*/images/jdk/bin/java -version
结果如下
angelica@LAPTOP-VJ3VKQJ5:/mnt/d/software/Java/jdk12-06222165c35f$ ./build/linux-x86_64-server-release/images/jdk/bin/java -version
openjdk version "12-internal" 2019-03-19
OpenJDK Runtime Environment (build 12-internal+0-adhoc.angelica.jdk12-06222165c35f)
OpenJDK 64-Bit Server VM (build 12-internal+0-adhoc.angelica.jdk12-06222165c35f, mixed mode, sharing)
确定是我下载的jdk12了！