java例程练习（用HashMap记录控制台输入）

import java.util.*; public class TestArgsWords { public static void main(String[] args) { Map m = new HashMap(); for(int i = 0; i < args.length; i++) { int freq = ((Integer) m.get(args[i]) == null ? 0 : (Integer) m.get(args[i])); m.put(args[i], (freq == 0 ? 1 : freq + 1)); } System.out.println (m.size() + " distinct words detected:"); System.out.println(m); } }