版本的比较不能直接用字符串的比较，先分割，相同级别比较（比较长度，比较大小）
import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); while (sc.hasNext()) { String[] strs = sc.nextLine().split(" "); String max = strs[0]; for (int i = 1;i < strs.length;i++) { max = compara(max,strs[i]) < 0 ? strs[i] : max; } System.out.println(max); } } private static int compara(String str1,String str2) { String[] tempStrs1 = str1.split("\\."); String[] tempStrs2 = str2.split("\\."); int ind = 0; int fla = 0; int min = Math.min(tempStrs1.length,tempStrs1.length); while (ind < min && (fla = tempStrs1[ind].length() - tempStrs2[ind].length()) == 0 && (fla = tempStrs1[ind].compareTo(tempStrs2[ind])) == 0) { ind++; } return fla == 0 ? tempStrs1.length - tempStrs2.length : fla; } }