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  1. 打开终端
  2. 编辑 ~/.bash_profile
  3. 新增一行内容 export JAVA_HOME=$(/usr/libexec/java_home)
  4. 执行 source .bash_profile
  5. 测试: echo $JAVA_HOME


In this tutorial, we show you how to set $JAVA_HOME environment variable on latest or older Mac OSX.

1. Mac OSX 10.5 or later

In Mac OSX 10.5 or later, Apple recommends to set the $JAVA_HOME variable to /usr/libexec/java_home, just export $JAVA_HOME in file ~/.bash_profile or ~/.profile.

$ vim .bash_profile
export JAVA_HOME=$(/usr/libexec/java_home)
$ source .bash_profile
$ echo $JAVA_HOME

Why /usr/libexec/java_home?

This java_home can return the Java version specified in Java Preferences for the current user. For examples,

/usr/libexec/java_home -V
Matching Java Virtual Machines (3):
1.7.0_05, x86_64: "Java SE 7" /Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home
1.6.0_41-b02-445, x86_64: "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
1.6.0_41-b02-445, i386: "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

This Mac OSX has three JDK installed.

    ##return top Java version
$ /usr/libexec/java_home

## I want Java version 1.6
$ /usr/libexec/java_home -v 1.6