```public class Example05 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.print("请输入字母："); String str = sc.nextLine(); int upper = fun1(str); int lower = fun2(str); System.out.println("大写字母数量=" + upper); System.out.println("小写字母数量=" + lower); sc.close(); } public static int fun1(String str) { int count = 0; for (int i = 0; i < str.length(); i++) { char ch = str.charAt(i); if (ch >= 'A' && ch<='Z') count++; } return count; } public static int fun2(String str) { int count = 0; for (int i = 0; i < str.length(); i++) { char ch = str.charAt(i); if (ch >= 'a' && ch<='z') count++; } return count; } } ```