那些Iterator迭代器们

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java.util.Iterator it = properties.keySet().iterator();
			while(it.hasNext()){
				String sKey = it.next().toString();
				if(sKey.startsWith("request.")){
					String sValue = properties.getProperty(sKey);
					requestObject.put(sKey.substring(8), sValue);
				}
			}

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public static Map getMap4Json(String jsonString){
	    JSONObject jsonObject = JSONObject.fromObject( jsonString );  
	    Iterator  keyIter = jsonObject.keys();
	    String key;
	    Object value;
	    Map valueMap = new HashMap();

	    while( keyIter.hasNext())
	    {
	        key = (String)keyIter.next();
	        value = jsonObject.get(key);
	        valueMap.put(key, value);
	    }
	    
	    return valueMap;
	}

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Set<String> keysSet = map.keySet();			
		Iterator<String> iterator = keysSet.iterator();			
		while(iterator.hasNext()) {				
		Object key = iterator.next();//key				
		Object value = map.get(key);//value		
		sb.append("&"+key+"="+value);
		}

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Map map = new HashMap();
			JSONObject obj = JSONObject.fromBean(requeString);
			Iterator it = obj.keys();
			while (it.hasNext()) {
				String key = (String) it.next();
				String value = obj.getString(key);
				map.put(key, value);
			}

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List query = getSession().createSQLQuery(hql.toString()).list();
	    Iterator iter=query.iterator(); 
	    while(iter.hasNext()){