如果我理解正确，您只想从 list1 中删除单个 2 元素而不是全部其中.您可以遍历 list2 并尝试从 list1 中删除每个元素.请记住，如果 list2 不能包含重复项，还有比这更有效的方法.

If I understand correctly, you only want to remove a single 2 element from list1 rather than all of them. You can iterate over list2 and attempt to remove each element from list1. Keep in mind that there are more efficient methods than this if list2 cannot contain duplicates.

var list1 = new ArrayList<>(List.of(1, 2, 2));
var list2 = List.of(2, 3, 4);

list2.forEach(list1::remove);    

list1 现在包含以下内容:

[1, 2]

请参阅 starman1979 的答案以获取相同的解决方案，但使用 lambda 而不是方法引用.

See starman1979's answer for the same solution, but using a lambda rather than a method reference.