CODEWITHSUNDEEP
java
Null Pointer
Null Pointer

Reputation: 275

How to call multiple methods at same time?

I am trying to call some methods in a method and storing in different different List for further use in same method. So, is it possible to call all at same time. Here is codes:

List<Student> students = studentMao.getAll(collegeId);
List<Department> departments = departmentsMao.getByCollegeId(collegeId);
List<College> colleges = collegeMao.getByUniversityId(universityId);

Please any suggestion

Upvotes: 0

Views: 2466

Answers (1)

Rubms
Rubms

Reputation: 745

In order to run all three methods concurrently you can use Executor to run concurrent threads, and wait for the result thanks to Future. Something like:

Executor executor = Executors.newFixedThreadPool(3);
Future<List<Student>> studentsFuture = executor.submit(() -> return studentMao.getAll(collegeId));
Future<List<Department>> departmentsFuture = executor.submit(() -> return departmentsMao.getByCollegeId(collegeId));
Future<List<College>> collegesFuture = executor.submit(() -> return collegeMao.getByUniversityId(universityId));

List<Student> students = studentsFuture.get();
List<Department> departments = departmentsFuture.get();
List<College> colleges = collegesFuture.get();

Get waits until the current task running in another threads finishes, so this piece of code will finish when all the concurrent threads have finished.

Upvotes: 2

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