To check the Java version, you can use the java -version command in CMD to view the JRE version used by the current system. If you need to view the JDK compiler version, use javac -version; if the command cannot be recognized, it may be that Java is not installed or environment variables are not configured, you need to go to the official website to download and install and add the Java bin directory to the system PATH; if multiple Java versions are installed, you can view the path order through the where java command, and switch the default version by modifying PATH or using the version management tool.
Opening CMD to check the Java version is actually very simple, and it can be done with just one command. The premise is that your system has Java installed and environment variables are configured.
1. Use the java -version command to view the version
This is the most commonly used and direct method.
On Windows, press Win R , enter cmd to enter, enter the command prompt interface, and then enter:
java -version
This outputs the version information of the Java Runtime Environment (JRE) used by the current system. Usually includes version number, build version and runtime environment, etc.
If you need more detailed development tool information, such as the compiler version, you can use:
javac -version
But note that this command only displays the compiler (JDK) version and does not output other additional information.
Common outputs are similar to this:
java version "17.0.8" 2023-07-18 LTS Java(TM) SE Runtime Environment (build 17.0.8 9-LTS-211) Java HotSpot(TM) 64-Bit Server VM (build 17.0.8 9-LTS-211, mixed mode, sharing)
2. What if the command cannot be recognized?
Sometimes you will see an error message like this:
'java' is not recognized as an internal or external command, operable program or batch file.
This means that the system has not found java.exe , and there are several possible reasons:
- No Java installed
- Java is installed but environment variables are not configured
- The system path PATH does not contain Java installation directory
The solution is as follows:
- Confirm whether Java is installed, you can download and install it on the official website: http://ipnx.cn/link/a02220f2e07341451b6d20b9a83ed8ff
- After installing JDK, find the
bindirectory under the installation path (for example,C:\Program Files\Java\jdk-17.0.8\bin) - Add this path to the system's
PATHenvironment variable - Open a new CMD window again and run
java -version
3. Check multiple Java versions and confirm which one is currently using
Some developers may have multiple Java versions installed on their computers, such as JDK 8 and JDK 17. At this time, you can confirm which version you are currently using in the following ways:
- Execute the
where javacommand to see the path order in which the system looks forjava.exe - If you want to switch the default version, you can modify the order of Java in
PATHin the environment variable, or use tools such as Jabba or SDKMAN! to manage multiple versions
Basically that's it. Checking the Java version itself is not difficult, but only if you want to make sure the installation is correct and the environment variables are configured without problems. Sometimes behind seemingly simple commands, there are some small details that are easily overlooked.
The above is the detailed content of how to check java version in cmd. For more information, please follow other related articles on the PHP Chinese website!
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