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For more details, see the DigitalOcean guide on installing Java with apt on Ubuntu.
1
Update apt package index
2
sudo apt update
3
Install the default JRE
4
sudo apt install default-jre
5
Verify the Java installation
6
java -version
7
Install the default JDK
8
sudo apt install default-jdk
9
Verify the JDK installation
10
javac -version

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