你可能想在Windows/System32文件夹中找到以下文件: ——java.exe ——javaw.exe ——javaws.exe

Because, the path variable is including these files, you can get a headache trying to figure out why the java -version or javac -version keeps pointing to the old JAVA_HOME: rename those files, take out the extension with an underscore, for instance. And then, you only will have to create the JAVA_HOME variable, add it to the path variable (e.g., %JAVA_HOME%) and append the "\bin" particle. This way you need to only change the JAVA_HOME variable pointing to different JRE or JDK and have multiple installations of java just by setting JAVA_HOME.

这也意味着最好手动安装Java，不需要安装程序，这样您就可以随意使用它。

在cmd中(暂时用于该cmd窗口):

set JAVA_HOME="C:\\....\java\jdk1.x.y_zz"

echo %JAVA_HOME%

set PATH=%PATH%;%JAVA_HOME%\bin

echo %PATH%

这是从www.java.com -此处设置Java环境的官方解决方案。

有针对Windows 7、Windows Vista、Windows XP、Linux/Solaris和其他shell的解决方案。

例子

Windows 7 Select Computer from the Start menu Choose System Properties from the context menu Click Advanced system settings -> Advanced tab Click on Environment Variables, under System Variables, find PATH, and click on it. In the Edit windows, modify PATH by adding the location of the class to the value for PATH. If you do not have the item PATH, you may select to add a new variable and add PATH as the name and the location of the class as the value. Reopen Command prompt window, and run your Java code.

http://javahowto.blogspot.com/2006/05/javahome-vs-javahome.html

控制面板> Java, Java选项卡，单击“查看”按钮。在运行时参数中，放入:

-Djava.home=YOUR_PATH_HERE

或者当你执行Java时，你可以在命令中添加命令行开关:

java -Djava.home=PATH SomeJavaApp

你可能想在Windows/System32文件夹中找到以下文件: ——java.exe ——javaw.exe ——javaws.exe

Because, the path variable is including these files, you can get a headache trying to figure out why the java -version or javac -version keeps pointing to the old JAVA_HOME: rename those files, take out the extension with an underscore, for instance. And then, you only will have to create the JAVA_HOME variable, add it to the path variable (e.g., %JAVA_HOME%) and append the "\bin" particle. This way you need to only change the JAVA_HOME variable pointing to different JRE or JDK and have multiple installations of java just by setting JAVA_HOME.

这也意味着最好手动安装Java，不需要安装程序，这样您就可以随意使用它。

goto Mycomputer(这台PC) ->右键单击->选择属性->高级系统设置->环境变量->在系统变量中单击“新建”按钮并在变量名称和路径C:\Program Files\Java\ jdk1.8.0_131 were jdk在变量值中存在->单击确定。

在设置JAVA_HOME后关闭并重新打开命令提示符。有时更改不会反映在设置JAVA_HOME之前打开的cmd中。

你也可以通过终端设置JAVA_HOME: SET JAVA_HOME="C:\Program Files (x86)\Java\jdk1.8.0_131"