12.小写字母转大写字母

package day5; //小写字母转大写字母 public class shuzu4 { public static void main(String[] args) { char[] letters = new char[26]; for(int i=0; i<letters.length; i++) { letters[i] = (char)('a'+i);//因为i为int } for(int i=0; i<letters.length; i++) System.out.println(letters[i] + "->" + (char)(letters[i]-32)); } }