@Test
public void prefixSearch() throws Exception {

    TrieTree trieTree = new TrieTree();
    trieTree.insert("abc");
    trieTree.insert("abd");
    trieTree.insert("ABe");
    List<String> ab = trieTree.prefixSearch("AB");
    for (String s : ab) {
        System.out.println(s);
    }
    System.out.println("========");
    //char[] chars = new char[3] ;
    //for (int i = 0; i < 3; i++) {
    //    int a = 97 + i ;
    //    chars[i] = (char) a ;
    //}
    //
    //String s = String.valueOf(chars);
    //System.out.println(s);
}