Java を使用して文字列内の文字と部分文字列の数をカウントする方法の例

import java.util.Scanner;
public class Counter {
  static Scanner scanner = new Scanner(System.in);
  public static void count(String s) {
    int low, upper, num, others;
    low = upper = num = others = 0;
    for (int i = 0; i < s.length(); i++) {
      if (Character.isDigit(s.charAt(i))) {
        num++;
        continue;
      }
      if (Character.isLowerCase(s.charAt(i))) {
        low++;
        continue;
      }
      if (Character.isUpperCase(s.charAt(i))) {
        upper++;
        continue;
      } else {
        others++;
      }
    }
    System.out.println(" 大写字母的个数为：" + upper + "\n 小写字母的个数为：" + low+ "\n 数字的个数为： " + num + "\n 其他字符的个数为： " + others);
  }
  public static void subCounter(String str1, String str2) {
    int counter = 0;
    for (int i = 0; i <= str1.length() - str2.length(); i++) {
      if (str1.substring(i, i + str2.length()).equalsIgnoreCase(str2)) {
        counter++;
      }
    }
    System.out.println("子字符串的个数为： " + counter);
  }
  public static void main(String[] args) {
    // TODO Auto-generated method stub
    System.out.println("请输入一个字符串:");
    String string = scanner.nextLine();
    count(string);
    System.out.println("-----------------------------");
    // 查询在这个字符串中存在多少个子字符串str。
    System.out.println("请输入一个您想查询的子字符串:");
    String str = scanner.nextLine();
    subCounter(string, str);
  }
}