文章目录

• 将 List 转 数组
• • List.toArra()
  • Stream().toArray()
• 将 数组 转 List
• • Lists.newArrayList()
  • Stream.of()

将 List 转 数组

List.toArra()

		List<Integer> list = Lists.newArrayList(1, 2, 3);
		
		// 无需转换类型 --> [1,2,3]
		Integer[] intArray = list.toArray(new Integer[0]);
		

Stream().toArray()

		List<Integer> list = Lists.newArrayList(1, 2, 3);

		// 需要转换类型 --> ["1","2","3"]
		String[] strArray = list.stream().map(String::valueOf).toArray(String[]::new);
		

将 数组 转 List

Lists.newArrayList()

		String[] arr = {"1", "2", "3"};
		
		// 无需转换类型 --> ["1","2","3"]
		List<String> list = Lists.newArrayList(arr);
		

Stream.of()

		String[] arr = {"1", "2", "3"};
		
		// 需要转换类型 --> [1,2,3]
		List<Integer> list = Stream.of(arr).map(Integer::parseInt).collect(Collectors.toList());