Enter the command java -version.-If Java version is installed on your system, you see a Java installed response. The command will display the default Java version: openjdk 11.0.8 OpenJDK Runtime Environment (build 11.8+10-post-Ubuntu-0ubuntu120.04) OpenJDK 64-Bit Server VM (build 11.8+10-post-Ubuntu-0ubuntu120.04, mixed mode, sharing. To find out which Java version is installed on your system, run the java -version command: java -version.
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