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在Java中拆平(扁平化)List主要有以下几种常见方法：

news 2025/11/3 5:55:32

使用Java 8 Stream API实现List扁平化

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List<List<String>> nestedList = Arrays.asList( Arrays.asList("a", "b"), Arrays.asList("c", "d") ); List<String> flatList = nestedList.stream() .flatMap(List::stream) .collect(Collectors.toList()); // 结果: [a, b, c, d]

使用传统循环方式拆平List

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List<List<Integer>> numbers = Arrays.asList( Arrays.asList(1, 2), Arrays.asList(3, 4) ); List<Integer> result = new ArrayList<>(); for (List<Integer> subList : numbers) { result.addAll(subList); }

使用Guava库的Iterables.concat()方法

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List<List<String>> lists = Arrays.asList( Arrays.asList("x", "y"), Arrays.asList("z") ); Iterable<String> combined = Iterables.concat(lists); List<String> flattened = Lists.newArrayList(combined);

处理包含分隔符字符串的List扁平化

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List<String> stringList = Arrays.asList("a,b,c", "d,e", "f"); List<String> flattened = stringList.stream() .flatMap(s -> Arrays.stream(s.split(","))) .collect(Collectors.toList()); // 结果: [a, b, c, d, e, f]

多线程处理大型List的扁平化

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List<List<Object>> bigList = ...; List<Object> result = Collections.synchronizedList(new ArrayList<>()); bigList.parallelStream().forEach(result::addAll);

注意事项：