Is there an elegant way to rename Java boolean values to improve the readability of my code?

Say I have the following (Java 8) code:

private void toggleNewUser() {
	if (ToggleButton.isOn()) {
		fadeLabel(true);
		transitionButtons(true);
	}
	else {
		fadeLabels(false);
		transitionButtons(true);
	}
}

My fadeLabel and transitionButtons functions switch between fading and transitioning in and out, and they do so when the boolean are true and false respectively. But I would like to replace true and false with "in" and "out" to improve the readability of my code. Is there any elegant way to do so?

The only way I could come up with is kind of clunky and not really elegant:

private void toggleNewUser() {

	boolean in = ToggleButton.isOn();
	boolean out = ToggleButton.isOn();

	if (ToggleButton.isOn()) {
		fadeLabel(in);
		transitionButtons(in);
	}
	else {
		fadeLabels(out);
		transitionButtons(out);
	}
}

As a simple way, maybe defining constants for TRUE and FALSE is fine? Define them in your class like:

public static final boolean IN = true;
public static final boolean OUT = false;

Otherwise you're pretty limited with Java. You could also try enum:

public enum Anim {
	IN(true),
	OUT(false);
	 
	public final boolean state;
	 
	private Element(boolean state) {
	    this.state = state;
    }
}