empty : Java Glossary
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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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