freq.java

来自「Java样例程序集合：2D」· Java 代码 · 共 18 行

import java.util.*;

public class Freq {

    public static void main(String args[]) {
        Map<String, Integer> m = new HashMap<String, Integer>();

        // Initialize frequency table from command line
        for (String a : args) {
            int freq =  m.get(a);
            m.put(a, freq==0 ? 1 : freq + 1);
        }

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