string s="113545asadf5555vnm.hk#&&1158ghs "

string s="113545asadf5555vnm.hk#&&1158ghs "如何分别对数字字母进行排序

---

public static void main(String[] args) {
    String s = "113545asadf5555vnm.hk#&&1158ghs ";

    System.out.println(sortNum(s));
    System.out.println(sortAlphabet(s));
}

private static String sortNum(String s) {
    char c;
    List<Character> numList = new ArrayList<Character>();
    for (int i = 0; i < s.length(); i++) {
        c = s.charAt(i);
        if ('0' <= c && c <= '9') {
            numList.add(c);
        }
    }

    Collections.sort(numList);
    StringBuilder sb = new StringBuilder();
    for (Character character : numList) {
        sb.append(character);
    }

    return sb.toString();
}

private static String sortAlphabet(String s) {
    char c;
    List<Character> alphabetList = new ArrayList<Character>();
    for (int i = 0; i < s.length(); i++) {
        c = s.charAt(i);
        if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z')) {
            alphabetList.add(c);
        }
    }

    Collections.sort(alphabetList);
    StringBuilder sb = new StringBuilder();
    for (Character character : alphabetList) {
        sb.append(character);
    }

    return sb.toString();
}