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| package com.panzhihua.common.utlis;
|
| import java.util.Map;
| import java.util.concurrent.ConcurrentHashMap;
| import java.util.function.Function;
| import java.util.function.Predicate;
|
| public class ListUtils {
|
| public static <T> Predicate<T> distinctByKey(Function<? super T, Object> keyExtractor) {
| Map<Object, Boolean> seen = new ConcurrentHashMap<>();
| return t -> seen.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
| }
| }
|
|
