The question is when I checked the java version using java -version, it still shows that 64-bit is still running.

问题是当我使用 java -version 检查 java 版本时，它仍然显示 64 位仍在运行。

That's not strictly true. There is no copy of Java still / already running. (Or if there is, you aren't talking to itwhen you run java -version.)

这不完全正确。没有 Java 副本仍在/已经在运行。（或者如果有的话，当你运行时你不会和它说话java -version。）

What this actuallyshows is that your command shell runs a 64-bit Java when you gave it the command name java. And the reason for that is that shell's %PATH% variable is telling the shell to look in the directory containing the 64-bit version, rather than the 32-bit version; i.e. you haven't changed it!

这实际上表明，当您为其指定命令名称时，您的命令外壳运行的是 64 位 Java java。原因是 shell 的 %PATH% 变量告诉 shell 在包含 64 位版本而不是 32 位版本的目录中查找；即你没有改变它！

What you need to do is to change the shell's %PATH% and %JAVA_HOME% environment variables to point to the correct place. The %JAVA_HOME% should point to the installation directory, and the %PATH% variable should include %JAVA_HOME%\bin.

您需要做的是更改 shell 的 %PATH% 和 %JAVA_HOME% 环境变量以指向正确的位置。%JAVA_HOME% 应指向安装目录，%PATH% 变量应包含 %JAVA_HOME%\bin。

You have to set the JAVA_HOMEenvironment variable to the path of the JDK version you want to use.

您必须将JAVA_HOME环境变量设置为要使用的 JDK 版本的路径。

For 2000/XP see: http://confluence.atlassian.com/display/DOC/Setting+the+JAVA_HOME+Variable+in+Windows

对于 2000/XP，请参阅：http: //confluence.atlassian.com/display/DOC/Setting+the+JAVA_HOME+Variable+in+Windows

For Windows 7 see: http://www.itechtalk.com/thread3595.html(this is not a tutorial to set the JAVA_HOMEvariable, but a generic environment variable: please adapt to your needs.)

对于 Windows 7，请参见：http: //www.itechtalk.com/thread3595.html（这不是设置JAVA_HOME变量的教程，而是通用环境变量：请根据您的需要进行调整。）

If you want to change the Java version you see when running java -versionon the command line, then you have to change the PATHenvironment variable so that it contains a path to the bindirectory of the JDK you want to use. See: http://www.java.com/en/download/help/path.xml
Remember to close the command shell and re-open it after you change the PATHvariable.

如果要更改在java -version命令行上运行时看到的 Java 版本，则必须更改PATH环境变量，使其包含bin要使用的 JDK 目录的路径。请参阅：http: //www.java.com/en/download/help/path.xml
请记住关闭命令外壳并在更改PATH变量后重新打开它。

I found that on Windows 7, I had to edit the JAVA_HOMEpath in the registry entries in multiple places in order to completelyswitch to a different path for another java installation. Changing JAVA_HOMEin the environment variables is not enough. You can do a quick test yourself:

我发现在 Windows 7 上，我必须JAVA_HOME在多个位置编辑注册表项中的路径才能完全切换到另一个 java 安装的不同路径。改变JAVA_HOME环境变量是不够的。你可以自己做一个快速测试：

1. Rename your Java Home directory.
2. Update your %JAVA_HOME%environment variable value to reflect the new name of your JAVA_HOME.
3. Run java -versionin a new command window.

1. 重命名您的 Java 主目录。
2. 更新您的%JAVA_HOME%环境变量值以反映您的JAVA_HOME.
3. java -version在新的命令窗口中运行。

You will get an error message saying

你会收到一条错误信息说

Error: could not open `C:\your_java_home_path\jre7\lib\amd64\jvm.cfg'

Therefore, it's not the same behavior as on Linux where simply changing $JAVA_HOMEis enough to change your pointer to a new installation directory of your java.

因此，它与 Linux 上的行为不同，在 Linux 上，只需更改$JAVA_HOME就足以将指针更改为指向 java 的新安装目录。

Looks like Windows hard codes the java home path in its registry in multiple places.

看起来 Windows 在其注册表中的多个位置对 java 主路径进行了硬编码。

Start --> Run --> regedit

Under HKEY_LOCAL_MACHINE / SOFTWARE / JavaSoft / ...expand each directory and edit every java home path that you find hard coded to your new JAVA_HOMEpath in each registry where it occurs.

在HKEY_LOCAL_MACHINE / SOFTWARE / JavaSoft / ...展开每个目录并编辑您发现的每个 java 主路径下，这些路径被硬编码到JAVA_HOME它出现的每个注册表中的新路径。