Java Glossary : empty

Last updated 2004-06-28 by Roedy Green ©1996-2004 Canadian Mind Products

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empty

A zero-length String. i.e. x.length() == 0, e.g. "". If the empty String is interned, you can detect it with:

if ( x == "" )

If not, you must use:

if ( x == null || x.length() == 0 )

One of the most common sources of error in Java programs comes from confusing the three different flavours of void strings: blank, empty and null.

blank ¤ intern ¤ literal ¤ null ¤ void

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