实例006-字母大小写转换

代码如下：

public class WordChange {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("请输入要进行转换的字母");
        char c = in.next().charAt(0);
        if (c >= 'A' && c <= 'Z') {
            c+=32;
            System.out.println(c);
        } else if (c >= 'a' && c <= 'z') {
            c -= 32;
            System.out.println(c);
        } else {
            System.out.println("格式不正确，请重新输入");
        }
    }
}

结果如下：

请输入要进行转换的字母
q
Q
 
Process finished with exit code 0