package com.iluwatar;

public enum HairType {

	BALD, SHORT, CURLY, LONG_STRAIGHT, LONG_CURLY;

	@Override
	public String toString() {
		return name().toLowerCase().replaceAll("_", " ");
	}

}

package com.iluwatar;

public enum HairType {

	BALD("bald"), SHORT("short"), CURLY("curly"), LONG_STRAIGHT("long straight"), LONG_CURLY("long curly");

    private String title;

    HairType(String title) {
        this.title = title;
    }

    @Override
	public String toString() {
		return title;
	}
}

Update HairType enum in builder pattern.