Java Data Type - 如何通过不同的方法循环遍历"color"枚举和打印值

import java.awt.Color;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.HashMap;

public class Main {
  public static void main(String[] args) throws IllegalAccessException {
    Class clazz = Color.class;
    Field[] colorFields = clazz.getDeclaredFields();

    HashMap<String, Color> singleColors = new HashMap<String, Color>();
    for (Field cf : colorFields) {
      int modifiers = cf.getModifiers();
      if (!Modifier.isPublic(modifiers))
        continue;

      Color c = (Color) cf.get(null);
      if (!singleColors.values().contains(c))
        singleColors.put(cf.getName(), c);
    }

    for (String k : singleColors.keySet()) {
      System.out.println(k + ": " + singleColors.get(k));
    }
  }
}