剔除List中的重复值

方法一：循环元素删除

// 删除ArrayList中重复元素
public static void removeDuplicate(Listlist) {
for ( int i = 0 ;i < list.size() - 1 ;i ++ ) {
for ( int j = list.size() - 1 ;j > i;j -- ) {
if (list.get(j).equals(list.get(i))) {
list.remove(j);
}
}
}
System.out.println(list);
}

方法二：通过HashSet剔除

// 删除ArrayList中重复元素
public static void removeDuplicate(Listlist) {
HashSeth = new HashSet(list);
list.clear();
list.addAll(h);
System.out.println(list);
}

方法三： 删除ArrayList中重复元素，保持顺序

// 删除ArrayList中重复元素，保持顺序
public static void removeDuplicateWithOrder(Listlist) {
Setset = new HashSet();
ListnewList = new ArrayList();
for (Iteratoriter = list.iterator();iter.hasNext();) {
Objectelement = iter.next();
if (set.add(element))
newList.add(element);
}
list.clear();
list.addAll(newList);
System.out.println( " removeduplicate " + list);
}