花了一个中午搞定了一个单词计数器，可以按照字典和频率两种排序，功能还比较强大。
package treeroot.util;
//anthor treeroot
//since 2004-12-3
public class Word{
private String value;
public Word(String value){
this.value=value.toLowerCase();
}
private int count=1;
protected void increase(){
count++;
}
public String getWord(){
return value;
}
public int getCount(){
return count;
}
public boolean equals(Object o){
return (o instanceof Word)&&(((Word)o).value.equals(value));
}
public int hashCode(){
return value.hashCode();
}
}
package treeroot.util;
//author treeroot
//since 2004-12-3
import java.util.*;
public class WordCount
{
private static class WordSet implements Set{
private Map map=new HashMap();
public int size(){
return map.size();
}
public boolean isEmpty(){
return map.isEmpty();
}
public boolean contains(Object o){
return map.containsKey(o);
}
public Iterator iterator(){
return map.keySet().iterator();
}
public Object[] toArray(){
return map.keySet().toArray();
}
public Object[] toArray(Object[] a){
return map.keySet().toArray(a);
}
public boolean add(Object o){
if(map.containsKey(o)){
((Word)map.get(o)).increase();
}
else {
map.put(o,o);
}
return true;
}
public boolean remove(Object o){
return false;
}
public boolean addAll(Collection c){
return false;
}
public boolean removeAll(Collection c){
return false;
}
public boolean retainAll(Collection c){
return false;
}
public boolean containsAll(Collection c){
return map.keySet().containsAll(c);
}
public void clear(){}
public boolean equals(Object c){
return map.keySet().equals(c);
}
public int hashCode(){
return map.keySet().hashCode();
}
}
public static Set getWordCount(String s,Comparator order){
Set set=new WordSet();
String split1="[^a-zA-Z//-_']+";
String split2="[^a-zA-Z]+[//-_'][^a-zA-Z]*";
String split3="[^a-zA-Z]*[//-_'][^a-zA-Z]+";
String regex = "("+split2+")|("+split3+")|("+split1+")";
String[] words = s.split(regex);
for(int i=0;i<words.length;i++){
set.add(new Word(words[i]));
}
Set sort=new TreeSet(order);
sort.addAll(set);
return Collections.synchronizedSet(sort);
}
public static Comparator DICTIONARY_ORDER=new Comparator(){
public int compare(Object o1,Object o2){
Word w1=(Word)o1;
Word w2=(Word)o2;
return w1.getWord().compareTo(w2.getWord());
}
};
public static Comparator FREQUENCY_ORDER =new Comparator(){
public int compare(Object o1,Object o2){
Word w1=(Word)o1;
Word w2=(Word)o2;
int i=w2.getCount()-w1.getCount();
if(i==0){
return w1.getWord().compareTo(w2.getWord());
}
return i;
}
};
public static void main(String[] args)
{
String s="A regular expression, specified as a string, must first be compiled into an instance of this class. The resulting pattern can then be used to create a Matcher object that can match arbitrary character sequences against the regular expression. All of the state involved in performing a match resides in the matcher, so many matchers can share the same pattern. ";
Set set=WordCount.getWordCount(s,WordCount.FREQUENCY_ORDER);
for(Iterator it=set.iterator();it.hasNext();){
Word w=(Word)it.next();
int i=4-w.getWord().length()/8;
String tab="";
for(int j=0;j<i;j++)
tab+="/t";
System.out.println(w.getWord()+tab+w.getCount());
}
}
}