去除list中的重复元素

用HashSet

 

Iterator it =list.iterator();
HashSet set = new HashSet();

while(it.hasNext()){
set.add(it.next());
}
it = set.iterator();

list.clear();
while(it.hasNext()){
list.add(it.next());
}

或者是

 

list = new ArrayList(new HashSet(oldList));