java實作統計字串中字元及子字串個數的方法範例

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); } }