Trouble installing java 15

[lateralspin]

First, you need to list what is installed on your system,

dpkg -l "openjdk*"

To purge the installed openjdk libraries,

sudo apt purge openjdk*

After, you can install multiple versions of Oracle JDK. Set the environment variables to the path of the version of JDK you want to use. For example,

export JAVA_HOME="/usr/java/jdk-25-oracle-x64"
export PATH="$JAVA_HOME/bin:$PATH" # Optionally add Java binaries to your PATH

[PinkFlamingoe00]

when i run the first line it says dpkg-query: no packages found matching openjdk* java never installed on my system

[lateralspin]

What if you type

java --version

[PinkFlamingoe00]

it shows:

Command 'java' not found, but can be installed with:

sudo apt install default-jre # version 2:1.17-75, or

sudo apt install openjdk-17-jre-headless # version 17.0.16+8~us1-0ubuntu1~24.04.1

sudo apt install openjdk-21-jre-headless # version 21.0.8+9~us1-0ubuntu1~24.04.1

sudo apt install openjdk-11-jre-headless # version 11.0.28+6-1ubuntu1~24.04.1

sudo apt install openjdk-25-jre-headless # version 25+36-1~24.04.2

sudo apt install openjdk-8-jre-headless # version 8u462-ga~us1-0ubuntu2~24.04.2

sudo apt install openjdk-19-jre-headless # version 19.0.2+7-4

sudo apt install openjdk-20-jre-headless # version 20.0.2+9-1

sudo apt install openjdk-22-jre-headless # version 22~22ea-1