使用Collection#retainAll()。

listA.retainAll(listB);
// listA now contains only the elements which are also contained in listB.

如果要避免更改受到影响listA，则需要创建一个新的更改。

List<Integer> common = new ArrayList<Integer>(listA);
common.retainAll(listB);
// common now contains only the elements which are contained in listA and listB.