Mac OS X上的Java安装位置在哪里？

问题：

I just downloaded Java 7u17 on Mac OS 10.7.5 from here and then successfully installed it. 我刚刚从下载在Mac OS 10.7.5的Java 7u17 这里，然后安装成功。 In order to do some JNI programming, I need to know where Java installed on my Mac. 为了做一些JNI编程，我需要知道在Mac上安装Java的位置。

I thought that inside the /Library/Java/JavaVirtualMachines/ folder, there would be a folder called 1.7.0.jdk or something, but then I found that the folder is empty. 我认为在/Library/Java/JavaVirtualMachines/文件夹中，会有一个名为1.7.0.jdk的文件夹，但后来我发现该文件夹是空的。 This was confirmed by running ls /Library/Java/JavaVirtualMachines/ in the Terminal. 通过在终端中运行ls /Library/Java/JavaVirtualMachines/来确认这一点。 I've tried searching for it to find out if it was installed somewhere else, but that doesn't seem to be turning anything up. 我已经尝试搜索它以查明它是否安装在其他地方，但这似乎并没有改变任何东西。