question: @ Override public void insertString ( final int offs , final String str , final AttributeSet attr ) { if ( offs < 0 ) { return ; } if ( str . length ( ) > 1 ) { int i ; for ( i = 0 ; i < str . length ( ) ; i ++ ) { if ( str . charAt ( i ) == '\n' ) { remainingTextString = str . substring ( i + 1 ) ; remainingTextAttr = attr ; inputKeyListener . keyPressed ( new KeyEvent ( new Container ( ) , KeyEvent . KEY_PRESSED , 0 , 0 , KeyEvent . VK_ENTER , '\n' ) ) ; break ; } else { insertChar ( offs + i , "" + str . charAt ( i ) ) ; } } } else if ( str . length ( ) == 1 ) { insertChar ( offs , str ) ; } }
target:  Insert a String of source code to be highlighted to the document. The string is then inserted character by character if longer than 1 char.