本文實例講解了統計文本中某個字符串出現的次數或字符串中指定元素出現的次數方法,分享給大家供大家參考,具體內容如下
運行效果圖:
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統計字符串中指定元素出現次數方法,希望對大家的學習有所幫助。