java 連續數字數組分組

問題：
1. 將Lis list = Arrays.asList(1,2,3,5,8,9,10), 拆分成 [1,2,3] 、[5]、 [8,9,10] ,
2. 再傳入一個數字 9， 將匹配數字9的數組輸出來 ?

   /**
 * 將 int [1,2,3,5,8,9,10] 連續的分組成[1,2,3]、[5]、[8,9,10]
 * 再傳入9 ，匹配上面的分組取出 [9,10]
 * @param NoNum 傳入的整形數組
 * @param charct 傳入匹配的數字
 * @return 返回含有匹配數字的數組
 */

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;

}