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);
	}	
}