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Java 中将列表转换为Long[]数组两种方法

 9 months ago
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Java 中将列表转换为Long[]数组两种方法

23-08-16 banq

1、使用List.toArray()方法：

List<Long> list = Arrays.asList(1L, 2L, 3L, 4L, 5L);
Long[] array = new Long[list.size()];
array = list.toArray(array);

2、mapToLong()方法

List<Long> list = Arrays.asList(1L, 2L, 3L, 4L, 5L);
long[] array = list.stream().mapToLong(l -> l).toArray();

或：

List<Long> list = Arrays.asList(1L, 2L, 3L, 4L, 5L);
long[] array = list.stream().mapToLong(Long::longValue).toArray();

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