Mac commands

/System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java

uname -a

显示系统隐藏文件。在终端（Terminal）中输入如下命令：defaults write ~/Library/Preferences/com.apple.finder AppleShowAllFiles -bool true

（true 改成 false 就可以不再显示隐藏文件）需要重启，然后在finder中就可以看到隐藏文件了。

Remove the "system" JVM installed and maintained by Software Update

% sudo rm -rf /System/Library/Java/JavaVirtualMachines/1.6.0.jdk

Remove any Java Developer Previews

% sudo rm -rf /Library/Java/JavaVirtualMachines/1.6.0*.jdk

sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin