\x0d\x0a\x0d\x0aif(str.length()>1){\x0d\x0aSystem.out.println("输入的是字符串");\x0d\x0a}elseif(str.matches("[a-z]")){\x0d\x0aSystem.out.println("输入的是小写字母");\x0d\x0a}elseif(str.matches("[A-Z]")){\x0d\x0aSystem.out.println("输入的...
import java.util.Scanner;public class MyClass {public static void main(String[] args) {Scanner scanf = new Scanner(System.in);System.out.println("请输入字符串:");String str = scanf.nextLine();;scanf.close();char c = str.charAt(0);System.out.print("第一个字符为");if(c...