下面以Oracle的JDK7update 51为例：
• 32-bit JDK on Windows:
C:\Program Files (x86)\Java\jdk1.7.0_51
• 64-bit JDK on Windows:
C:\Program Files\Java\jdk1.7.0_51
• Mac OS X:
/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home
• Ubuntu Linux:
/usr/lib/jvm/java-7-oracle
原文：http://www.cnblogs.com/IcanFixIt/p/4294984.html