判断命令行输入的参数的个数

import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;

public class MapTest3 {
	public static void main(String[] args) {
		HashMap hashMap = new HashMap();
		for(int i=0;i<args.length;i++){
			if(hashMap.get(args[i]) == null){
				hashMap.put(args[i], new Integer(1));
			}
			else {
				Integer old = (Integer)hashMap.get(args[i]);
				old = new Integer(old.intValue() + 1);
				hashMap.put(args[i], old);
			}
		}
		
		Set set = hashMap.keySet();
		Iterator iter = set.iterator();
		while(iter.hasNext()){
			String key = (String)iter.next();
			Integer value = (Integer)hashMap.get(key);
			System.out.println(key+"="+value);
		}
	}
}