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.

If an object instance links to other objects via non-null instance fields or via references contained inside array fields, then IObjectProfileNode.children() will be a corresponding list of child ...

After the introduction, the training delves into other key pieces of the Java ecosystem, including courses in Java Objects, Arrays, and Comparisons and Control Structures.