巧思妙解 一行代码实现颜色按指定顺序排序算法题

巧思妙解 一行代码实现颜色按指定顺序排序算法题

题目 

方法一 

public static void main(String[] args) throws Exception {char[] a = "红黄红黄红红红黄蓝黄蓝".toCharArray();Arrays.sort(a);System.out.println(new String(a).replace("红","1").replace("黄","红").replace("红","蓝").replace("1","红"));
}

方法二

public static void main(String[] args) throws Exception {String a = "红黄红黄红红红黄蓝黄蓝";String ret = a.replaceAll("黄|蓝","");for (char e : a.toCharArray()) {