code: package org.optsol.project_scheduling.mrcpsp.constants.shared;
  
  import java.util.List;
  import java.util.stream.Collectors;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_E_i;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_L_i;
  
  public interface IConstants_T_i extends
          IConstants_T,
      IConstants_E_i,
      IConstants_L_i {
  
    //feasible starting times of activity i
    default List<Integer> get_T_i(int i) {
      return
          get_T().stream()
              .filter(t -> t >= get_E_i(i))
              .filter(t -> t <= get_L_i(i))
              .collect(Collectors.toList());
    }
  }
  