Stram流拼接
Stream<Integer> limit1 = Stream.of(1,1,1);
Stream<Integer> limit2 = Stream.of(2,2,2);
Stream<Integer> concat = Stream.concat(limit1, limit2);
List<Integer> collect = concat.collect(Collectors.toList());
Integer[] objects = collect.toArray(new Integer[0]);
System.out.println(Arrays.toString(objects));
// 结果输出：
// [1, 1, 1, 2, 2, 2]
List拼接
List<Integer> list1 = Arrays.asList(3, 3, 3);
List<Integer> list2 = Arrays.asList(4, 4, 4);
List<Integer> addList= new ArrayList<>();
addList.addAll(list1);
addList.addAll(list2);
System.out.println(Arrays.toString(addList.toArray()));
// 结果输出：
// [3, 3, 3, 4, 4, 4]
