java 8 中的减法运算用于减去列表

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时间:2020-11-02 17:55:05  来源:igfitidea点击:

Minus operation in java 8 for subtracting Lists

javaarraylistjava-8java-stream

提问by Manu Joy

Suppose I have two lists:

假设我有两个列表:

List<Integer> list1 =  Arrays.asList(1, 2, 3);
List<Integer> list2 =  Arrays.asList(1, 2, 4, 5);

Now I want to perform (list1 - list2). The expected ouptut is {3}. How to do this using java 8 streams?

现在我想表演(list1 - list2)。预期的输出是{3}。如何使用 java 8 流来做到这一点?

回答by Eran

If you must use Streams :

如果您必须使用 Streams :

List<Integer> diff = list1.stream()
                          .filter(i -> !list2.contains(i))
                          .collect (Collectors.toList());

回答by Hiren

Try this:

试试这个:

List<Integer> difference = new ArrayList<>(list1);
difference.removeAll(list2);
System.out.println("Remove: " + difference); //3

回答by Igal

Using Apache commons:

使用 Apache 公共资源:

CollectionUtils.subtract(list1, list2);

Pros: Very readable. Cons: No type safety

优点:可读性很强。缺点:没有类型安全