question: private static String mergeTextAndMnemonic ( String text , final int mnemonic , final int mnemonicIndex ) { if ( text == null ) { text = "" ; } final int index ; if ( mnemonicIndex >= 0 && mnemonicIndex < text . length ( ) && Character . toUpperCase ( text . charAt ( mnemonicIndex ) ) == mnemonic ) { index = mnemonicIndex ; } else { index = - 1 ; } final StringBuffer buffer = new StringBuffer ( text ) ; if ( index != - 1 ) { buffer . insert ( index , '&' ) ; for ( int i = buffer . length ( ) - 1 ; i >= 0 ; i -- ) { if ( buffer . charAt ( i ) == '&' && i != index ) { buffer . insert ( i , '&' ) ; } } } return buffer . toString ( ) ; }
target:  Utility method which merge together text and mnemonic at some position