java.util.Iteratoris the standard Java SE interface for object that implement the Iterator design pattern. The
java.lang.Iterableinterface is for objects that can provide an iterator.
HTML provides not only plain paragraph tags, but six separate header tags to indicate headings of various sizes and thicknesses. Enumerated as heading 1 through heading 6, heading 1 has the largest and thickest text while heading 6 is the smallest and thinnest, down to the paragraph level. This topic details proper usage of these tags.