question: public static File createTemporaryDirectory ( String prefix ) { while ( true ) { String candidateName = prefix + TEMPORARY_DIRECTORY_PRNG . nextInt ( ) ; File result = new File ( System . getProperty ( "java.io.tmpdir" ) , candidateName ) ; if ( result . mkdir ( ) ) { return result ; } } }
target:  Creates a unique new temporary directory under "java.io.tmpdir".