1 普通循环遍历
for (int i = 0; i < integers.size(); i++) {
System.out.println(integers.get(i));
}
2 迭代器遍历
Iterator<Integer> iterator = integers.iterator();
iterator.forEachRemaining(System.out::println);
integers.forEach(System.out::println);
for (Integer integer : integers) {
System.out.println(integer);
}
3 流遍历
Stream<Integer> stream = integers.stream();
stream.forEach(System.out::println);
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