The Java Development Kit (JDK) is a software development environment used to develop Java applications. It includes the Java Virtual Machine (JVM), which executes Java bytecode, and the Java compiler, which translates Java source code into bytecode. Checking the version of the JDK is important because it can help ensure that you are using the correct version for your project and that you are aware of any security updates or new features.
There are several ways to check the version of the JDK. One way is to use the java -version command. This command will print the version of the JDK that is installed on your system. Another way to check the version of the JDK is to use the javac -version command. This command will print the version of the Java compiler that is installed on your system.