取前k个出现频率最大的单词

package aprioriproduct;

import java.io.BufferedReader;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import javax.print.DocFlavor.BYTE_ARRAY;

public class AprioriProduct {
	private static TreeMap<String,Integer>tm=new TreeMap();
	private static int k=4;

	public static void main(String []args)
	{
		FileReader fr;
		try{
			fr=new FileReader("C:\\Examples6.txt");
			BufferedReader br=new BufferedReader(fr);
			String aline;
			while((aline=br.readLine())!=null)
			{
				String str =new String(aline);
				//System.out.println(str);
				String arrayList[]=str.split(",|\\.|:|;| ");
				for(String temp:arrayList)
				{
					//System.out.println(temp);

					if(!tm.containsKey(temp))
					{
						tm.put(temp,1);
					}
					else
					{
						tm.put(temp,tm.get(temp)+1);
					}
				}
			} 

			tm.remove(tm.firstKey());

			List arrayList = new ArrayList(tm.entrySet());
	        Collections.sort(arrayList, new Comparator() {
	            public int compare(Object o1, Object o2) {
	                Map.Entry obj1 = (Map.Entry) o1;
	                Map.Entry obj2 = (Map.Entry) o2;
	                return -((Integer) obj1.getValue()).compareTo((Integer) obj2
	                        .getValue());
	            }
	        });
	        for (int i = 0; i < k; i++)
	        {
	            System.out.println(((Map.Entry) arrayList.get(i)).getKey()
	                    + " " + ((Map.Entry) arrayList.get(i)).getValue());
	        }
			for(Iterator it =tm.keySet().iterator();it.hasNext();)
			{

				String key =it.next().toString();
				System.out.print(key+" ");
				System.out.println(tm.get(key));
			}

			fr.close();
			br.close();
		}

		catch(Exception e)
		{
			e.printStackTrace();
		}
	}
}

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