One of the advantages of code written in the functional programming style is that it's terse, and reads at a high level. Using a static import for the static methods of Collectors will help you retain that concision.

So, habitually using a static import for the Collectors class seems like a good practice.

Example

//these methods are commonly used with streams
import static java.util.stream.Collectors.*;
//import java.util.stream.Collectors;

import java.util.List;
import java.util.function.Predicate;
import java.util.function.ToIntFunction;
import java.util.stream.Stream;

/** @since Java 8 */
public final class StaticImportCollectors {
  
  /** Filter the Atoms somehow, and return them in a List. */
  List<Atom> filter(Predicate<Atom> predicate){
    return Stream.of(Atom.values())
      .filter(predicate)
      .collect(toList()) //WITH the static import of Collectors
      //.collect(Collectors.toList()) //WITHOUT the static import
    ;
  }
  
  /** 
   Filter the Atoms somehow, and summarize by turning each Atom into 
   an int of some sort, and then summing the int's. 
  */
  int filterAndSum(Predicate<Atom> predicate, ToIntFunction<Atom> summarizer){
    int result = Stream.of(Atom.values())
      .filter(predicate)
      .collect(summingInt(summarizer)) //WITH the static import of Collectors
      //.collect(Collectors.summingInt(summarizer)) //WITHOUT the static import
    ;
    return result;
  }

  /**
   Some data from the periodic table of the elements (incomplete!). 
  */
  enum Atom {
    H("Hydrogen", 1, false),
    Tc("Technetium", 43, true),
    Au("Gold", 79, false),
    Pb("Lead", 82, false),
    Pu("Plutonium", 94, true),
    Fm("Fermium", 100, true);
    private Atom(String name, Integer numProtons, Boolean isAlwaysUnstable){
      this.name = name;
      this.numProtons = numProtons;
      this.isAlwaysUnstable = isAlwaysUnstable;
    }
    Boolean isAlwaysUnstable() { return isAlwaysUnstable; }
    String getName() { return name;  }
    Integer getNumProtons() { return numProtons; }
    private String name;
    private Integer numProtons;
    private Boolean isAlwaysUnstable;
  }
}