针对Ubuntu 14.04
因为OpenJDK8不支持14.04的源，因此需要手动安装OpenJDK8
google官方配置开发环境链接 https://source.android.com/source/initializing.html步骤：
Download the .deb packages for 64-bit architecture from archive.ubuntu.com:
openjdk-8-jre-headless_8u45-b14-1_amd64.deb with SHA256 0f5aba8db39088283b51e00054813063173a4d8809f70033976f83e214ab56c0openjdk-8-jre_8u45-b14-1_amd64.deb with SHA256 9ef76c4562d39432b69baf6c18f199707c5c56a5b4566847df908b7d74e15849openjdk-8-jdk_8u45-b14-1_amd64.deb with SHA256 6e47215cf6205aa829e6a0a64985075bd29d1f428a4006a80c9db371c2fc3c4cOptionally, confirm the checksums of the downloaded files against the SHA256 string listed with each package above.
For example, with the sha256sum tool:
sha256sum {downloaded.deb file}Install the packages:
update
sudo apt-get updateRun dpkg for each of the .deb files you downloaded. It may PRoduce errors due to missing dependencies:
sudo dpkg -i {downloaded.deb file}To fix missing dependencies:
sudo apt-get -f install更新默认java版本：
sudo update-alternatives --config javasudo update-alternatives --config javac选择你要变更的JDK的版本就行。当然我们一般都在.zshrc中定义环境变量，因此只要改变zshrc中的环境变量就能达到jdk版本的变换，其实上述操作可以省略。针对Ubuntu 16.04 至于16.04，由于已经拥有OpenJDK8的源，直接安装就可以了，同时向下也兼容OpenJDK7，所以两个都进行安装后。在.zshrc或者.bashrc中配置环境变量属性就能进行切换了。由于这个步骤较为简单，就不赘述了。新闻热点
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