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Java has classes for a rich set of data structures.
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Once arrays are created, they cannot change size. But the class Vector can increase and decrease in size by adding and deleting elements.
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Strings cannot be changed at all once they are created. The Stringbuffer class does allow one to change the contents in place.
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The class HashTable creates a structure that maps keys to values.
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A subclass of HashTable is Properties, which can create and manipulate property lists.
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There is a class Stack for traditional stack structures.
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There are classes for Dates and Calendars.
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There are classes StringTokenizer and StreamTokenizer which usefully parse strings or streams to take out floating point numbers and identifiers as single entities.
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