用户输入upperCase和lowerCase - Java

import java.util.Scanner;

public class UpperLowerJava {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入一个大写字母：");
        char upperCase = scanner.next().charAt(0);

        System.out.print("请输入一个小写字母：");
        char lowerCase = scanner.next().charAt(0);

        System.out.println("大写字母：" + upperCase);
        System.out.println("小写字母：" + lowerCase);

        scanner.close();
    }
}