add java 8 to ubuntu code example

pipenv development code example text filed flutter code example remove untracked files git before checkout branch code example match \ in regex code example how to find max in a deque c++ code example is print an argument code example how to centralize item in flexbox code example python enegyusage without args code example subsrting in java code example Replace a value NA with the value from another column code example mysql show tables not show all table code example how to change git global email code example