java程序：统计一段英文段落中每个单词出现的次数，这个段落存储在一个字符串变量中
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
public class Article {
// 保存文章的内容
String content;
String[] rawWords;
String[] words;
int[] wordFreqs;
public Article() {
content = " ";
}
public void splitWord() {
final char SPACE = ' ';
content = content.replace('\'', SPACE).replace(',', SPACE)
.replace('.', SPACE);
content = content.replace('(', SPACE).replace(')', SPACE)
.replace('-', SPACE);
rawWords = content.split("\\s+");
}
public void countWordFreq() {
Set set = new TreeSet();
for (String word : rawWords) {
set.add(word);
}
Iterator ite = set.iterator();
List wordsList = new ArrayList();
List freqList = new ArrayList();
while (ite.hasNext()) {
String word = (String) ite.next();
int count = 0;
for (String str : rawWords) {
if (str.equals(word)) {
count++;
}
}
wordsList.add(word);
freqList.add(count++);
}
words = wordsList.toArray(new String[0]);
wordFreqs = new int[freqList.size()];
for (int i = 0; i < freqList.size(); i++) {
wordFreqs[i] = freqList.get(i);
}
}
public void sort() {
class Word {
private String word;
private int freq;
public Word(String word, int freq) {
this.word = word;
this.freq = freq;
}
}
class WordComparator implements Comparator {
public int compare(Object o1, Object o2) {
Word word1 = (Word) o1;
Word word2 = (Word) o2;
if (word1.freq < word2.freq) {
return 1;
} else if (word1.freq > word2.freq) {
return -1;
} else {
int len1 = word1.word.trim().length();
int len2 = word2.word.trim().length();
String min = len1 > len2 ? word2.word : word1.word;
String max = len1 > len2 ? word1.word : word2.word;
for (int i = 0; i < min.length(); i++) {
if (min.charAt(i) < max.charAt(i)) {
return 1;
}
}
return 1;
}
}
}
List wordList = new ArrayList();
for (int i = 0; i < words.length; i++) {
wordList.add(new Word(words[i], wordFreqs[i]));
}
Collections.sort(wordList, new WordComparator());
for (int i = 0; i < wordList.size(); i++) {
Word wor = (Word) wordList.get(i);
words[i] = wor.word;
wordFreqs[i] = wor.freq;
}
}
public void printResult() {
System.out.println("Total " + words.length
+ " different words in the content!");
for (int i = 0; i < words.length; i++) {
System.out.println(wordFreqs[i] + " " + words[i]);
}
}
public static void main(String[] args) {
Article a = new Article();
a.content = "sssssssssssaadwerqwersssdfsdftrytyum1242357689235cvbbnm,masdfasdfasdfasdf,fasdf.asdfasdfasdfasdfaasdfasdf";
a.splitWord();
a.countWordFreq();
a.sort();
a.printResult();
}
}
运行一下，看是否成功，的确是一个分号出错了！现在已经改好了！
package test;public class Practice{private static void readWord ( String input, String word, int offset, int count ){offset = input.indexOf (word, offset);if (offset != -1){System.out.println (word + " 在第 " + offset + " 个位置出现过.");readWord (input, word, ++offset, ++count);}else{System.out.println (word + " 总共出现了：" + count + " 次.");}}public static void main ( String[] args ){String input = "Look buddy, U got work hard and put yourself to the java, once U learned the heart of java, I can guarantee that U win.";String word = "java";readWord (input, word, 0, 0);}}
import java.util.HashMap;import java.util.Iterator;
import java.util.Scanner;
/**
* 字典类，记录文章中出现过的所有单词及其次数
* @author Administrator
*
*/
public class Dictionary {
private HashMap< String, Integer > dictionary;
private int wordsCount;
/**
* 字典这个类的构造函数
*/
public Dictionary() {
dictionary = new HashMap< String, Integer >();
wordsCount = 0;
}
/**
* 向字典里插入一个单词
* @param word
*/
public void insert( String word ) {
if ( dictionary.containsKey( word ) ) {
int currentCount = dictionary.get( word );
dictionary.put( word, currentCount + 1 );
} else {
dictionary.put( word, 1 );
}
wordsCount++;
}
/**
* 取得字典里所有不同的单词
* @return
*/
public int getDifferentWordsNum() {
return dictionary.size();
}
/**
* 返回字典里的所有单词 * 其出现次数
* @return
*/
public int getAllWordsNum() {
return wordsCount;
}
/**
* 展示字典中存放的所有单词及其出现次数
*/
public void displayDictionary() {
for ( Iterator< String > it = dictionary.keySet().iterator(); it.hasNext(); ) {
String key = it.next();
System.out.print( key );
System.out.print( ": " );
System.out.println( dictionary.get( key ) );
}
}
public static void main( String[] args ) throws Exception {
//这里放置你所说的段落
String passage = "public static void main( String[] args ) {";
Scanner scanner = new Scanner( passage );
Dictionary dict = new Dictionary();
while ( scanner.hasNextLine() ) {
String line =scanner.nextLine();
boolean isBlankLine = line.matches( "\\W" ) || line.length() == 0;
if ( isBlankLine ) {
continue;
}
String[] words = line.split( "\\W" );
for ( String word : words ) {
if ( word.length() != 0 ) {
dict.insert( word );
}
}
}
dict.displayDictionary();
}
}
设计一个JAVA程序，对一个保存英文文章的文本文件进行统计，最后给出每个英文字符及每个标点的出现次数，按出现次数的降幂排列。 你到底想问什么？残阳破晓SHUANG考虑采纳一下。有空到365testing,测评网,
import java.util.Enumeration;
import java.util.Hashtable;
public class MyTest {
private static Object String;
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String s="aabceeee";
char[] c=s.toCharArray();//转换成char[]
Hashtable h=new Hashtable();//用于存储
for(char c1:c) {
if(h.containsKey(c1))//判断是否已有了
((Counter)h.get(c1)).i++;//有了的话i++
else{
h.put(c1, new Counter());//没有的话存储到h
}
}
Enumeration e=h.keys();//keys的集合
while(e.hasMoreElements()){
Character ra= (Character) e.nextElement();
System.out.println(ra + "=" + ((Counter)h.get(ra)).i);//打印
}
}
}
class Counter{
int i=1;
}
上面的不知道你能看懂吗？？
用正则表达式
int n=0;
String duanluo=段落;
String regex="\\s匹配的单词\\s";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(duanluo);
while(matcher.find()) {
n++;
}
System.out.println(regex+"出现"n+"次");
。。。可能我理解错了 没试 但是这样的思路 会重复输出
String[] aa=duanluo.split(" ");
for(int i=0;i<aa.length;i++){
int n=1;
for(int j=i+1;j<aa.length;j++){
if(aa[i].trim().equals(aa[j].trim())){
n++;
}
}
System.out.println(aa[i]+"出现"+n+"次");
}
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