[hardwired]

Quote:

cannot resolve symbol
symbol : constructor KeyStroke ()
location: class javax.swing.KeyStroke
KeyStroke k = new KeyStroke();

The compiler is telling you it cannot find a no–argument Keystroke constructor.
Look in the KetStroke class api. There are no constructors. All KeyStroke instances are obtained from the static methods.

Code:

KeyStroke k = KeyStroke.getKeyStroke(5 possible args);

Quote:

cannot resolve symbol
symbol : method getKeyStroke ()
location: class javax.swing.KeyStroke
key = k.getKeyStroke();

Same thing: can't find a method getKeyStroke called on a KeyStroke instance. Check the api. A KeyStroke instance is already a KeyStroke.

Code:

KeyStroke keyStroke = KeyStroke.getKeyStroke("UP");