Answer 1

Setup JDK in Ubuntu
Steps:
1.Extract jdk to opt folder

command: sudo unzip jdk1.*.zip -d '/opt'

2.Edit your .bashrc file

command: gedit ~/.bashrc

3.Add the following lines at the end of .bashrc

export JAVA_HOME=/opt/jdk1.* PATH=.:$PATH:$JAVA_HOME/bin export PATH

4.Reload .bashrc and test version

command:source ~/.bashrc

command: java -version