1、成績統計。

輸入文件input.txt：

張三 語文12 數學31 英語11 李四 語文22 數學22 英語22 王五 語文33 數學33 英語33

期待輸出output.txt：

張三 語文12 數學31 英語11 總分54 李四 語文22 數學22 英語22 總分66 王五 語文33 數學33 英語33 總分99

代碼：

package com.my.test;import java.io.*; import java.util.ArrayList; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern;public class AnalysisResult {private static Pattern r = Pattern.compile("(\\d+)");private static int getTotal(String line) {Matcher m = r.matcher(line);int total = 0;while (m.find()) {total += Integer.valueOf(m.group(0));}return total;}public static void main(String args[]) {try {/* 讀入TXT文件 */File readFile = new File("input.txt");InputStreamReader inputStreamReader = new InputStreamReader(new FileInputStream(readFile));BufferedReader bufferedReader = new BufferedReader(inputStreamReader);String line;List<String> contents = new ArrayList<>();while ((line = bufferedReader.readLine()) != null) {contents.add(line);}bufferedReader.close();/* 寫入TXT文件 */File writeFile = new File("output.txt");BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(writeFile, true));PrintWriter pw = new PrintWriter(bufferedWriter);for (int i = 0; i != contents.size(); ++i) {String temp = contents.get(i);pw.println(temp + " 總分" + getTotal(temp));}bufferedWriter.flush();bufferedWriter.close();} catch (Exception e) {e.printStackTrace();}} }

/

2、單詞統計。

輸入文件input.txt：

Today, when I go home after school, I find that I lose my key. I feel so worried and try to remember all the places I have been to. As I walk into the shop, an old man stops me and asks if I lose the key. I feel so excited and say yes. At last, I find my key and go home. Though I am lucky this time, I tell myself not to do it again.

期待輸出：

代碼：

package com.my.test;import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.InputStreamReader; import java.util.*; import java.util.regex.Matcher; import java.util.regex.Pattern;public class WordStatistic {private static int total = 0;private static Pattern r = Pattern.compile("(\\b[a-zA-Z]+\\b)");private static Map<String, Integer> wordMap = new HashMap<>();private static void countWords(String line) {Matcher m = r.matcher(line);while (m.find()) {total++;String word = m.group(0);Integer wordCount = wordMap.get(word);if (wordCount != null) {wordMap.put(word, wordCount + 1);} else {wordMap.put(word, 1);}}}private static List sortByValue(Map<String, Integer> map) {List<Map.Entry<String, Integer>> result = new ArrayList<>(map.entrySet());result.sort(Comparator.comparing(Map.Entry::getValue));return result;}public static void main(String[] args) {try {/* 讀入TXT文件 */File readFile = new File("input.txt");InputStreamReader inputStreamReader = new InputStreamReader(new FileInputStream(readFile));BufferedReader bufferedReader = new BufferedReader(inputStreamReader);String line;while ((line = bufferedReader.readLine()) != null) {countWords(line);}bufferedReader.close();} catch (Exception e) {e.printStackTrace();}System.out.println("單詞總數：" + total);System.out.println("不同單詞的個數：" + wordMap.size());List list = sortByValue(wordMap);for (int i = list.size() - 1; i != 0; --i) {System.out.println(list.get(i));}} }

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轉載于:https://www.cnblogs.com/xkxf/p/10197837.html

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