Updating the PATH Environment Variable (Optional)
You can run the JDK without setting the
PATH environment variable, or you can optionally set it so that you can conveniently run the JDK executable files (
javadoc.exe, and so forth) from any directory without having to type the full path of the command. If you do not set the
PATH variable, you need to specify the full path to the executable file every time you run it, such as:
C:\> "C:\Program Files\Java\jdk1.7.0\bin\javac" MyClass.java
It is useful to set the
PATH variable permanently so it will persist after rebooting.
To set the
PATH variable permanently, add the full path of the
jdk1.7.0\bin directory to the
PATH variable. Typically, this full path looks something like
C:\Program Files\Java\jdk1.7.0\bin. Set the
PATH variable as follows on Microsoft Windows:
Click Start, then Control Panel, then System.
Click Advanced, then Environment Variables.
Add the location of the
binfolder of the JDK installation for the
PATHvariable in System Variables. The following is a typical value for the
- The PATH environment variable is a series of directories separated by semicolons (
;) and is not case-sensitive. Microsoft Windows looks for programs in the
PATHdirectories in order, from left to right.
- You should only have one bin directory for a JDK in the path at a time. Those following the first instance are ignored.
- If you are not sure where to add the path, add it to the right of the value of the
- The new path takes effect in each new command window you open after setting the
变量值：（变量值填写你的jdk的安装目录，例如本人是 C:\Program Files\Java\jdk1.8.0_60）
2.在系统变量中找到 Path 变量，选择编辑
（注意如果原来Path的变量值末尾没有 ; 号，就先输入 ; 号再输入上面的代码）
4.检验jdk是否配置成功：运行cmd 输入 java -version （java 和 -version 之间有空格） 或 javac -version