/** Update the interface display to show the current value of the calculator. */
private void redisplay() {
if (calc.isHexOn()) {
int displayInt = calc.getDisplayValue();
if (displayInt < 0) {
// toHexString() returns an unsigned integer as a String,
// meaning negative values return (String)(ffffffff - n) instead of (-n)
// example: -9 would show ffffffff - 9 = fffffff4
display.setText("-" + Integer.toHexString(Math.abs(displayInt)));
} else {
display.setText(Integer.toHexString(displayInt));
}
// show all hexButtons since hexSwitch is true
hexPanel.setVisible(true);
} else {
display.setText("" + calc.getDisplayValue());
// hide all hexButtons since hexSwitch is false
hexPanel.setVisible(false);
}
}
