partioning operation Java
@Test
public void givenList_whenParitioningIntoSublistsUsingPartitionBy_thenCorrect() {
List<Integer> intList = Lists.newArrayList(1, 2, 3, 4, 5, 6, 7, 8);
Map<Boolean, List<Integer>> groups =
intList.stream().collect(Collectors.partitioningBy(s -> s > 6));
List<List<Integer>> subSets = new ArrayList<List<Integer>>(groups.values());
List<Integer> lastPartition = subSets.get(1);
List<Integer> expectedLastPartition = Lists.<Integer> newArrayList(7, 8);
assertThat(subSets.size(), equalTo(2));
assertThat(lastPartition, equalTo(expectedLastPartition));
}
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