code: public void setEC2SecurityGroups(java.util.Collection<EC2SecurityGroup> eC2SecurityGroups) {
          if (eC2SecurityGroups == null) {
              this.eC2SecurityGroups = null;
              return;
          }
  
          this.eC2SecurityGroups = new com.amazonaws.internal.SdkInternalList<EC2SecurityGroup>(eC2SecurityGroups);
      }
docs: <p>
  A list of EC2 security groups that are permitted to access clusters associated with this cluster security group.
  </p>
  
  @param eC2SecurityGroups
  A list of EC2 security groups that are permitted to access clusters associated with this cluster security
  group.