List<String> list = new ArrayList<>();
list.add("aaa");
list.add(null);
list.add("bbb");
list.add(null);
list.removeAll(Collections.singleton(null));
//→”aaa”,"bbb"だけになる
Collections.singletonは特定の要素を含むimmutableなSetを返すstaticファクトリメソッド
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