question: @ Override @ SuppressWarnings ( "unchecked" ) protected final void initialize ( ) { final int patternSymbolsNum = countPatternSymbols ( getPattern ( ) ) ; if ( patternSymbolsNum > 0 ) { setInputs ( new Input [ patternSymbolsNum ] ) ; setSegments ( new String [ patternSymbolsNum + 1 ] ) ; final StringBuilder segmentsBuilder = new StringBuilder ( ) ; final StringBuilder patternBuilder = new StringBuilder ( getPattern ( ) ) ; int segmentCounter = 0 ; for ( int j = 0 ; j < patternSymbolsNum ; j ++ ) { int i = 0 ; while ( patternBuilder . charAt ( i ) != PATTERN_CHAR ) { segmentsBuilder . append ( patternBuilder . charAt ( i ) ) ; i ++ ; } segments [ segmentCounter ] = segmentsBuilder . toString ( ) ; segmentsBuilder . setLength ( 0 ) ; patternBuilder . delete ( 0 , i + 1 ) ; addExpressionParams ( patternBuilder , segmentCounter ) ; segmentCounter ++ ; } segments [ patternSymbolsNum ] = patternBuilder . toString ( ) ; } }
target:  see the description of the parent class (SimpleFormattingGenerator)