question: public void keyTyped ( KeyEvent evt ) { int modifiers = evt . getModifiers ( ) ; char c = evt . getKeyChar ( ) ; if ( c != KeyEvent . CHAR_UNDEFINED && ( modifiers & KeyEvent . ALT_MASK ) == 0 ) { if ( c >= 0x20 && c != 0x7f ) { KeyStroke keyStroke = KeyStroke . getKeyStroke ( Character . toUpperCase ( c ) ) ; Object o = currentBindings . get ( keyStroke ) ; if ( o instanceof Hashtable ) { currentBindings = ( Hashtable ) o ; return ; } else if ( o instanceof ActionListener ) { currentBindings = bindings ; executeAction ( ( ActionListener ) o , evt . getSource ( ) , String . valueOf ( c ) , modifiers ) ; return ; } currentBindings = bindings ; if ( grabAction != null ) { handleGrabAction ( evt ) ; return ; } if ( repeat && Character . isDigit ( c ) ) { repeatCount *= 10 ; repeatCount += ( c - '0' ) ; return ; } executeAction ( INSERT_CHAR , evt . getSource ( ) , String . valueOf ( evt . getKeyChar ( ) ) , modifiers ) ; repeatCount = 0 ; repeat = false ; } } }
target:  Handle a key typed event. This inserts the key into the text area.