在Unix术语中，环境^{(Environment)}变量是一个包含驱动器名称、路径名、文件名等信息的字符串。JAVA_HOME是一个环境变量，指向系统中安装Java 运行时环境^{(Java Runtime Environment)}或Java 开发工具包^{(Java Development Kit)}的目录。准确地说，如果您在计算机上的路径C:\Program Files\Java\jdk1.8.0_121Java ，那么您的Java_Home是C:\Program Files\Java\jdk1.8.0_121。基本上^(Basically)，JAVA_Home只是基于Java的程序使用的示例，例如Apache Tomcat和其他应用服务器工具，用于查找Java在系统中的放置位置。

这些第三方程序使用指向JDK或JRE目录的环境变量。简而言之，它使程序可以轻松地在计算机中找到像 javac 这样的可执行目录。如果您不使用这些第三方程序，那么用户可能不需要在您的系统中设置JAVA_Home。在本文中，我们将详细说明如何在Windows 10中将^{(Windows 10)}JAVA_HOME 设置^(JAVA_HOME)为环境变量。

在 Windows 10 中设置 JAVA_HOME

设置 JAVA_HOME^{(Set JAVA_HOME)}环境变量并更新系统路径

从官方网站 - java.com下载并安装Java。

安装后，转到开始^(Start)菜单并键入高级^(Advanced)系统设置。

单击列表中的查看高级系统设置^{(View advanced system settings)}以打开系统^(System) 属性^(Properties)。

转到高级^(Advanced)选项卡，然后单击环境变量^{( Environment Variable)}按钮。

在环境变量^{(Environment Variable)}窗口中，单击系统变量下的新建^(New)按钮。

在Edit System Variable中，将变量^(Variable)名称指定为JAVA_HOME，将变量^(Variable)值指定为JDK目录的路径。

单击确定^(OK)。

现在回到环境变量^{(Environment Variable)}窗口并选择系统变量下的路径。^{(select Path)}

单击编辑^(Edit)按钮打开编辑^(Edit)环境变量窗口。

单击新建按钮并  %JAVA_HOME%\bin.

单击确定^(OK)以应用更改。

^{(Check JAVA_HOME)}使用CMD^(CMD)检查 JAVA_HOME配置设置

要测试您的配置，请打开命令提示符^{(Command prompt)}。

键入echo %JAVA_HOME%并按Enter。这应该打印JAVA_HOME指向的JDK的目录。相反，如果您看到一个空格，则表示您设置环境变量失败。

下一个类型javac -version应该打印Java编译器的版本。

如果不是，它将打印一条消息，指出 javac 未被识别为内部或外部命令。这意味着路径变量设置不正确。

Hope this helps!

How to set JAVA_HOME in Windows 10

In Unix terminolоgy, an Environment variable is a string that holds information such as drive name, pathname, filename, etc. JAVA_HOME is an environment variable which addresses to the directory where Java Runtime Environment or Java Development Kit is installed in the system. To be precise say if you have installed Java in the path C:\Program Files\Java\jdk1.8.0_121 on your computer then your Java_Home is C:\Program Files\Java\jdk1.8.0_121. Basically, JAVA_Home is simply an exemplary used by Java-based programs like Apache Tomcat and other app server tools to find where Java is placed in the system.

These third-party programs make use of the environment variables that point to the directory of JDK or JRE. In simple words, it makes easy for the programs to locate the directory executable like javac in the computer. If you are not using these third party programs, then it may not be mandatory for users to set up JAVA_Home in your system. In this article, we will explain in detail how to set JAVA_HOME as the environment variable in Windows 10.

Setting JAVA_HOME in Windows 10

Set JAVA_HOME environment variable & update the system path

Download and install Java from the official site – java.com.

After installation, Go to Start menu and type Advanced system settings.

Click on View advanced system settings from the list to open System Properties.

Go to Advanced tab and click on Environment Variables button.

In the Environment Variable window, click on New button under the System variable.

In the Edit System Variable, give the Variable name as JAVA_HOME and Variable value as the path to your JDK directory.

Click on OK.

Now go back to the Environment Variable window and select Path under the System variable.

Click on Edit button to open Edit environment variable window.

Click on New button and type  %JAVA_HOME%\bin.

Click OK to apply the changes.

Check JAVA_HOME configuration setup using CMD

To test your configuration, open Command prompt.

Type echo %JAVA_HOME% and hit Enter. This should print the directory of the JDK which the JAVA_HOME is pointing. Instead, if you see a space, it means you have failed in setting up environment variable.

Next Type javac -version which should print the version of Java compiler.

If not it will print a message that the javac is not recognized as an internal or external command. This means the path variable is not set correctly.

Hope this helps!

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