package cn.silence;public class StrDemo3 {/*** 有如下字符串:"12ab","java","cd","Server78"* //遍历这些字符串，如果字符串没有包含数字的，就将字符串中的小写字母转成大写字母并打印字符串*/public static void main(String[] args) {String[] a = {"12ab", "java", "cd", "Server78", "2156erg65ER15"};for (int i = 0; i < a.length; i++) {strDemo(a[i]);}}private static void strDemo(String str) {char[] chars = str.toCharArray();String includeNumber = "";for (int i = 0; i < chars.length; i++) {char aChar = chars[i];if (aChar > '0' && aChar <= '9') {includeNumber += aChar;}}if (!includeNumber.equals("")) {System.out.println(str + "    包含了数字: " + includeNumber);return;}System.out.println(str + "    没有包含数字,转换为大写后为: " + str.toUpperCase());}}