Java用Map查找词频

import java.util.*;


public class Freq {

    public static void main(String[] args) {/** N o w J a v a . c o m 提供 **/

        Map<String, Integer> m = new HashMap<String, Integer>();


        // Initialize frequency table from command line

        for (String a : args) {

            Integer freq = m.get(a);

            m.put(a, (freq == null) ? 1 : freq + 1);

        }


        System.out.println(m.size() + " distinct words:");

        System.out.println(m);

    }

}