mohammad_soleimani :
I'm trying compare 2 lists , first list type is Long and second list Employee Object, and I want result set in a Map<ID, Exists> (Map<Long, Boolean>).
Note: first list has more Item from second list
List<Employee> employees = List.of(new Employee(2), new Employee(4), new Employee(6));
List<Long> ids = List.of(1L, 2L, 3L, 4L, 5L, 6L);
i need output
1 : false
2 : true
3 : false
4 : true
5 : false
6 : true
my code is:
resultMap = employees.stream().collect( Collectors.toMap(Employee::getId, (
anything ->
ids.contains(anything.getId() ) )));
for (Entry<Long, Boolean> entity : resultMap.entrySet()) {
System.out.println(entity.getKey() + " : " + entity.getValue());
}
but output is:
2 : true
4 : true
6 : true
Hadi J :
Try this:
Set<Long> employeesId =repository.getByIds(ids).stream()
.map(Employee::getId)
.collect(Collectors.toSet());
then
Map<Long,Boolean> map = ids.stream()
.collect(Collectors
.toMap(Function.identity(),id->employeesId.contains(id)));
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