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the `java -version` command is a useful command-line instruction that allows you to check which version of the java runtime environment (jre) is installed on your system. this information is crucial for developers and users who need to ensure that their applications run on the correct version of java.
tutorial: using the `java -version` command
step 1: open command prompt or terminal
**windows**:
1. press `win + r`, type `cmd`, and hit enter.
2. alternatively, type `cmd` in the search bar and select command prompt.
**macos**:
1. open `terminal` from the applications utilities folder or search for it using spotlight (cmd + space).
**linux**:
1. open a terminal window from your applications menu or using a keyboard shortcut (usually ctrl + alt + t).
step 2: check java installation
once you have your command prompt or terminal open, you can check your java version by typing the following command:
step 3: interpret the output
when you run the command, you will see output similar to the following:
in this output:
the first line indicates the version of java installed. in this example, it shows java version 17.0.1.
the second line provides details about the runtime environment.
the third line indicates the type of java virtual machine (jvm) being used.
step 4: common issues
**java not installed**: if you receive an error message like `'java' is not recognized as an internal or external command, operable program or batch file.` on windows, or `command not found` on macos/linux, it means java is not installed or not added to your system's path variable.
**multiple versions**: if multiple versions of java are installed, the command will return the version that is currently set in the system's path variable. you can manage multiple versions using tools like sdkman! or jenv.
example code
below is an example of how you might write a simple java program to demonstrate that you have the right version installed.
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