实有人口新增模板导入接口开发

tangxiaobao

2021-08-06 f8ab89a945944ad0b570e9473aac6fbd175f4a2a

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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;
    }
}