install java on ubuntu

1sudo apt-get install openjdk-8-jdk

1sudo apt install default-jdk
2

1sudo apt install default-jre # installs java
2sudo apt install default-jdk # installs javac

1readlink -f $(which java) 
2

1sudo apt install default-jre
2

1// for debian & debian based linux distributions
2	sudo su or su -
3  	echo "deb http://ppa.launchpad.net/linuxuprising/java/ubuntu focal main" | tee /etc/apt/sources.list.d/linuxuprising-java.list
4    apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 73C3DB2A
5    apt-get update
6    Ctrl + D or exit
7// for Ubuntu, Linux Mint, Pop!_OS or Zorin Os
8	sudo add-apt-repository ppa:linuxuprising/java
9    sudo apt update
10    
11// Now you can install Oracle JDK 16 on Debian / Ubuntu and Linux distributions based on these:
12	//Install and make Oracle JDK 16 the default JDK version:
13		sudo apt install oracle-java16-installer --install-recommends
14    //Install but don't make Oracle JDK 16 the default JDK version:
15		sudo apt install oracle-java16-installer --no-install-recommends
16        
17//To check which Java version is set as default on your system
18	java -version or javac -version
19
20//To accept the Oracle Java 16 license automatically
21	echo oracle-java16-installer shared/accepted-oracle-license-v1-2 select true | sudo /usr/bin/debconf-set-selections
22    	//If that doesn't work, also try this command:
23    echo oracle-java16-installer shared/accepted-oracle-licence-v1-2 boolean true | sudo /usr/bin/debconf-set-selections