Both Arrays.toString(Object[]) and Arrays.deepToString(Object[]) handle null array gracefully, simply returning a String “null”. I tend to use Java Collections far more than I use Java arrays.

Right-click the Java file you want to edit and select "Open With." Click your Java compiler to open the code in the editor. Add the "Random" class library to the top of the source code file.

Imagine that your typical Java array is an Excel spreadsheet. Were that the case, you’d have created a table with just a single column. We might consider it a “one dimensional” database, in ...