WebApr 24, 2024 · 背景 Java8使用Stream编写出来的代码相当简洁, 有时候需要使用distinct()方法去重, 针对比较复杂的对象的时候, distinct()就没法工作了. 解决方... WebDec 9, 2024 · distinctByKey函数返回的是Predicate函数，类型为T。 这个函数传入一个函数（lambda），对传入的对象提取key，然后尝试将key放入concurrentHashMap，如果能放进去，说明此key之前没出现过，函数返回false；如果不能放进去，说明这个key和之前的某个key重复了，函数返回true。

Java 8 Stream - Distinct By Property Example

WebMar 18, 2024 · Add a comment. 2. Here is my solution based on the class Item which defines a name and a price: public class Item { public String name; public double price; Item (String name, double price) { this.name = name; this.price = price; } } The requirement is to obtain only Item s from a given List which have distinct name s and distinct price s ... jcaho medication

Java 8 Distinct Example - concretepage

WebOct 8, 2024 · And to get a new filtered collection by name, we can use: List personListFiltered = personList.stream () .filter (distinctByKey (p -> p.getName ())) .collect (Collectors.toList ()); 3. Using Eclipse Collections. Eclipse Collections is a library that provides additional methods for processing Streams and collections in Java. Web几种列表去重的方法. 在这里我来分享几种列表去重的方法，如有纰漏，请不吝赐教。 1. Stream 的distinct()方法. distinct()是Java 8 中 Stream 提供的方法，返回的是由该流中不同元素组成的流。distinct()使用 hashCode() 和 eqauls() 方法来获取不同的元素。 因此，需要去重的类必须实现 hashCode() 和 equals() 方法。 WebOct 1, 2024 · The distinct () method returns a stream of unique elements. It is a stateful intermediate operation and returns a new stream. This method uses hashCode () and equals () to get the unique elements. The sorted () method returns a stream consisting of elements in the sorted natural order. This method can also accept a comparator to provide ... jcaho medication reassessment