把map中的值全部打印出来

/**
	 * @param h
	 * @return 实现对map按照value升序排序
	 */
	@SuppressWarnings("unchecked")
	public static Map.Entry[] getSortedHashtableByValue(Map h) {
		Set set = h.entrySet();
		Map.Entry[] entries = (Map.Entry[]) set.toArray(new Map.Entry[set
				.size()]);
		Arrays.sort(entries, new Comparator() {
			public int compare(Object arg0, Object arg1) {
				Long key1 = Long.valueOf(((Map.Entry) arg0).getValue()
						.toString());
				Long key2 = Long.valueOf(((Map.Entry) arg1).getValue()
						.toString());
				return key1.compareTo(key2);
			}
		});

		return entries;
	}

	/**
	 * @param h
	 * @return 实现对map按照key排序
	 */
	@SuppressWarnings("unchecked")
	public static Map.Entry[] getSortedHashtableByKey(Map h) {

		Set set = h.entrySet();

		Map.Entry[] entries = (Map.Entry[]) set.toArray(new Map.Entry[set
				.size()]);

		Arrays.sort(entries, new Comparator() {
			public int compare(Object arg0, Object arg1) {
				Object key1 = ((Map.Entry) arg0).getKey();
				Object key2 = ((Map.Entry) arg1).getKey();
				return ((Comparable) key1).compareTo(key2);
			}

		});

		return entries;
	}

 Map map = new HashMap();
map.set( "a ", "b ");
Iterator it = map.keySet().iterator();
while (it.hasNext()) {
Object key =it.next();
System.out.println( "key is "+key);
System.out.println( "value is "+map.get(key));

}