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Java allows you lot to form your object inwards natural club past times implementing Comparable interface. It's ane of the key interface of Java API together with defined inwards java.lang package, which agency you lot don't involve to implement this dissimilar its counterpart Comparator , which is defined inwards java.util package.  Comparable is used to render natural club of sorting to objects e.g. numeric club is natural club for numbers, alphabetic club is natural club for String together with chronological club is natural for dates. Similarly when you lot define your ain objects e.g. Person, sorting it on refer sounds natural. Similarly for teams, ranking seems their natural orders. It all depends how object is looked inwards their domain. By the way, you lot are non express to simply ane order, you lot tin form objects inwards whatever club past times using java.util.Comparator , equally nosotros own got seen inwards our finally article custom sorting inwards Java ....