JDK1.8stream根据对象的某一字段去重

 1 List list = new ArrayList<>();
 2 
 3 
 4 List listByName = list.stream().filter(distinctByName).collect(Collectors.toList());
 5 
 6 
 7 private static <T> Predicate<T> distinctByName(Function<? super T , Object> keyExtractor) {
 8      
 9     Map<Object , Boolean> seen = new ConcurrentHaskMap<>();
10     return t -> seen.putIfAbsent(keyExtractor.apply(t)) , Boolean.True) == null;     
11     
12 }