JAVA 8：如何在一行中初始化列表列表

Question

您好我想在一行中初始化列表列表

List<List<Integer>> list = .....;

谢谢

Answer 1

List<List<Integer>>&nbsp;list&nbsp;=&nbsp;Arrays.asList(Arrays.asList(1,2),&nbsp;Arrays.asList(3,4));在 Java 9+ 中，您可以替换Arrays.asList()为List.of()：List<List<Integer>>&nbsp;list&nbsp;=&nbsp;List.of(List.of(1,2),&nbsp;List.of(3,4));

Answer 2

List<List<Integer>>&nbsp;list&nbsp;=&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;Arrays.asList(Arrays.asList(1,2,3),&nbsp;Arrays.asList(4,5,6));