You can add one or several random numbers into your array variables, but Java does not guarantee that each number is unique. Right-click the Java file you want to edit and select "Open With." ...

Changes to v1.1. Improved output display. Tells user about adding number to array from option 2. Outputs from Bash console: $ java ArrayAddTest Press -1 to Delete a number: Press 0 to see all the ...

the number will increase incrementally with each new item. Unlike a list in say Python, however, Java arrays are of a fixed size. There is no way to remove elements or to add to the array at run time.