package stringdemo;import java.util.Scanner;public class stringChat {public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.println("请输入一个字符串：");String line = sc.nextLine();for (int i=0;i<line.length();i++){System.out.println(line.charAt(i));}}
}
package stringdemo;import java.util.Scanner;public class countString {public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.println("请输入一个字符串");String line = sc.nextLine();int bc = 0;int scu = 0;int nc = 0;for(int i=0;i<line.length();i++){char ch = line.charAt(i);if(ch >'A' && ch<'Z'){bc++;}else if(ch >= 'a' && ch <='z'){scu++;}else if(ch>='0' && ch <='9'){nc++;}}System.out.println("大写"+bc);System.out.println("小写"+scu);System.out.println("数字"+nc);}
}