Java 基础知识

1.JAVA 遍历Map所有元素

//eg JDK1.5
Map  m  =  new HashMap();

for (Object o : map.keySet()){
       map.get(o);  
}

//JDK1.4
Map map = new HashMap();

Iterator it = map.entrySet().iterator();
while (it.hasNext())
{  
   Map.Entry entry = (Map.Entry) it.next();
   Object key = entry.getKey();
   Object value = entry.getValue();
} 

2. Hibernate order in case insensitive mode

Criteria.addOrder( Order.asc( "field" ).ignoreCase());