package se;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

public class damn {
	public static void main(String[] args) throws IOException {
		String str2 = System.getProperty("java.io.tmpdir");
		System.out.println(str2);
		long start = System.currentTimeMillis(); // 程式開始時間
		File file = new File("C:/Users/Wll/Desktop/Computer.txt");

		BufferedReader br = new BufferedReader(new FileReader(file));
		StringBuilder sb = new StringBuilder();
		String line = null;
		while ((line = br.readLine()) != null) {
			sb.append(line);
		}
		br.close(); // 關閉流

		String words = sb.toString(); // 全部的單詞字串
		String targetString = words.replaceAll("[.,\"\\?!:;\\(\\)]", ""); // 將標點替換為空

		// 分詞並且定義英文中不代表實際意義的一些單詞，如介詞、代詞、情態動詞等
		String[] singleWord = targetString.split(" ");
		String[] keys = { "you", "i", "he", "she", "me", "him", "her", "it",
				"they", "them", "we", "us", "your", "yours", "our", "his",
				"her", "its", "my", "in", "into", "on", "for", "out", "up",
				"down", "at", "to", "too", "with", "by", "about", "among",
				"between", "over", "from", "be", "been", "am", "is", "are",
				"was", "were", "whthout", "the", "of", "and", "a", "an",
				"that", "this", "be", "or", "as", "will", "would", "can",
				"could", "may", "might", "shall", "should", "must", "has",
				"have", "had", "than" };

		// 將一部分常見的無意義的英語單詞替換為字元 '#' 以便後面輸出單詞出現次數時的判斷
		for (int i = 0; i < singleWord.length; i++) {
			for (String str : keys) {
				if (singleWord[i].equals(str))
					singleWord[i] = "#";
			}
		}

		// 將單詞以及其出現的次數關聯起來
		for (int i = 0; i < singleWord.length; i++) {
			count++; // 計算單詞個數
			if ((wordMap.get(singleWord[i]) != null)) {
				int value = ((Integer) wordMap.get(singleWord[i])).intValue();
				value++;
				wordMap.put(singleWord[i].toLowerCase(), new Integer(value)); // 將單詞轉換為小寫存放以統一格式
			} else {
				wordMap.put(singleWord[i].toLowerCase(), new Integer(1));
			}

		}

		System.out.println("\t\t--檔案資訊--");
		System.out.println("     名稱： " + file.getName() + "    大小： "
				+ file.length() / 1024 + " KB");
		System.out.println("\t\t--檔案資訊--");
		System.out.println();
		System.out.println("■■■■ " + count + " 個單詞中出現頻率最高的 10 個單詞如下■■■■");

		// 比較器， 按值排序
		System.setProperty("java.util.Arrays.useLegacyMergeSort", "true");
		List<Entry<String, Integer>> list = new ArrayList<Entry<String, Integer>>(
				wordMap.entrySet());
		Collections.sort(list, new Comparator<Entry<String, Integer>>() {
			public int compare(Entry<String, Integer> e1,
					Entry<String, Integer> e2) {
				if (e2.getValue() != null && e1.getValue() != null
						&& e2.getValue().compareTo(e1.getValue()) > 0) {
					return 1;
				} else {
					return -1;
				}
			}
		});

		int wordCount = 1; // 記錄已經輸出單詞的個數
		for (Map.Entry<String, Integer> entry : list) {
			if (entry.getKey().equals("#")) // 相當於過濾作用，不輸出介詞、代詞、情態動詞等無意義單詞
				continue;
			System.out.printf("\t%2d、 %8s \t %4d次\n", wordCount,
					entry.getKey(), entry.getValue());
			if (wordCount++ == 10) { // 表示只輸出10個
				long end = System.currentTimeMillis(); // 程式結束時間
				System.out.println("■■■■■■■■■■■■■■■ 耗時 " + (end - start)
						+ " ms" + " ■■■■■■■■■■■■■■■■");
				return;
			}
		}
	}

	private static HashMap<String, Integer> wordMap = new HashMap<String, Integer>();
	private static int count = 0;
}
 

        程式執行情況如下：

        總的來說，這個程式自己覺得還是完成得比較好，而且從中也學到了很多。比如正則表示式之前沒怎麼接觸過，這次就學習了許多正則表示式相關的知識。另外，也進一步熟悉了HashMap類和ArrayList類。除此之外，還學到了一些編寫程式的方法與技巧，使得程式碼條理更加清晰。