java 连续数字数组分组

问题：  
      1.  将Lis<Integer> list = Arrays.asList(1,2,3,5,8,9,10),  拆分成   [1,2,3]  、[5]、 [8,9,10]  , 
      2. 再传入一个数字 9， 将匹配数字9的数组输出来  ?


   /**
 * 将 int [1,2,3,5,8,9,10] 连续的分组成[1,2,3]、[5]、[8,9,10]
 * 再传入9 ，匹配上面的分组取出 [9,10]
 * @param NoNum 传入的整形数组
 * @param charct 传入匹配的数字
 * @return 返回含有匹配数字的数组
 */

public  String convert(List<Integer> NoNum, int charct) {
	int state = 0;
	String result = "";
	for (int i = 0; i < NoNum.size(); i++)
	{
		if (i == NoNum.size() - 1){
			state = 2;
		}
		if (state == 0)
		{
			if (NoNum.get(i + 1) == NoNum.get(i) + 1)
			{
				result += Integer.toString(NoNum.get(i));
				result += "-";
				state = 1;
			}
			else
			{
				result += Integer.toString(NoNum.get(i));
				result += ",";
			}
		}
		else if (state == 1)
		{
			if (NoNum.get(i + 1) != NoNum.get(i) + 1)
			{
				result += Integer.toString(NoNum.get(i));
				result += ",";
				state = 0;
			} else {
				result += NoNum.get(i)+"-";
			}
		}
		else
		{
			result += Integer.toString(NoNum.get(i));
		}
	}

	String [] str = result.split(",");
	for ( int stritem = 0 ; stritem < str.length ; stritem++ ) {
		String [] sp = str[stritem].split("-");
		List<String> tt = Arrays.asList(sp);
		if ( tt.contains( charct+"")) {
			result = str[stritem].replace("-",",");
		}
	}
	return result;

}