Java编程——输入一行字符，分别统计出其中英文字母、空格、数字和其它字符的个数。

import java.util.*;
public class lianxi07 {
public static void main(String[] args) {
int digital = 0;
int character = 0;
int other = 0;
int blank = 0;
     char[] ch = null;
     Scanner sc = new Scanner(System.in);
     String s = sc.nextLine();
     ch = s.toCharArray();
     for(int i=0; i<ch.length; i++) {
      if(ch >= '0' && ch <= '9') {
       digital ++;
      } else if((ch >= 'a' && ch <= 'z') || ch > 'A' && ch <= 'Z') {
       character ++;
      } else if(ch == ' ') {
       blank ++;
      } else {
       other ++;
      }
      }
     System.out.println("数字个数: " + digital);
     System.out.println("英文字母个数: " + character);
     System.out.println("空格个数: " + blank);
     System.out.println("其他字符个数:" + other );
}
}