本文實(shí)例講解了統(tǒng)計(jì)文本中某個(gè)字符串出現(xiàn)的次數(shù)或字符串中指定元素出現(xiàn)的次數(shù)方法，分享給大家供大家參考，具體內(nèi)容如下
運(yùn)行效果圖：
程序查找的上此文件帶"a"的字符在多少次
具體代碼如下
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package com.zuidaima.util.string; import java.io.*; public class CountString { public static int count(String filename, String target) throws FileNotFoundException, IOException { FileReader fr = new FileReader(filename); BufferedReader br = new BufferedReader(fr); StringBuilder strb = new StringBuilder(); while (true) { String line = br.readLine(); if (line == null) { break; } strb.append(line); } String result = strb.toString(); int count = 0; int index = 0; while (true) { index = result.indexOf(target, index + 1); if (index > 0) { count++; } else { break; } } br.close(); return count; } public static void main(String[] args) { try { System.out.println(count("D:\\zuidaima.txt", "a")); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } } |
以上就是java統(tǒng)計(jì)字符串中指定元素出現(xiàn)次數(shù)方法，希望對(duì)大家的學(xué)習(xí)有所幫助。
