java实现统计字符串中字符及子字符串个数的方法示例

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);  }}