2. UsingStream.distinct()to Remove Duplicate Elements and Get a New List We can use the Java 8Stream.distinct()method which returns a stream consisting of the distinct elements compared by the object’sequals()method. Finally, collect all district elements asListusingCollectors.toList(). ArrayL...
获取有重复值的ArrayList。 从这个ArrayList创建一个新的List。 使用Stream().distinct()方法,返回不同的对象流。 将此对象流转换为List下面是上述方法的实现。// Java program to remove duplicates from ArrayList import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util....
接下来,我们使用Java Stream来根据name和age属性进行去重操作: List<User>distinctUsers=userList.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(()->newTreeSet<>(Comparator.comparing(user->user.getName()+";"+user.getAge())),ArrayList::new)); 1. 2. 3. 4. 5. 上面的代码中...
Few simple examples to find or count the duplicates in stream and remove the duplicates from stream in Java 8. We will use ArrayList to provide stream of elements including duplicates. Few simple examples to find and count the duplicates in aStreamand remove those duplicates sinceJava 8. We w...
4. Remove Duplicates From a List Using Java 8 Lambdas Finally, let’s look at a new solution, using Lambdas in Java 8. We’lluse thedistinct()method from the Stream API,which returns a stream consisting of distinct elements based on the result returned by theequals()method. ...
一、去除List中重复的String public ListremoveStringListDupli(ListstringList) { Setset = new LinkedHashSet<>(); set.addAll(stringList); stringList.clear(); stringList.addAll(sukIhkSiSiet); return stringList; } 或使用java8的写法: Listunique = list.stream().distinct().collect(Collectors.toLis...
Stream distinct() with custom objects Let’s look at a simple example of using distinct() to remove duplicate elements from alist. package com.journaldev.java; import java.util.ArrayList; import java.util.List; import java.util.stream.Collectors; ...
List<String> unique = list.stream().distinct().collect(Collectors.toList()); 1. 二、List中对象去重 比如现在有一个 Person类: public class Person { private Long id; private String name; public Person(Long id, String name) { this.id = id; ...
stringList.clear(); stringList.addAll(set);returnstringList; } 或使用Java8的写法: List<String>unique=list.stream().distinct().collect(Collectors.toList()); 1 1 可以参见:http://stackoverflow.com/questions/30745048/how-to-remove-duplicate-objects-from-java-arraylist ...
io.ObjectOutputStream s) throws java.io.IOException{ // 序列之前需要保存原本的修改的次数,序列化的过程中不允许新修改 int expectedModCount = modCount; // 将当前类的非静态和非transient的字段写到流中,其实就是默认的序列化 s.defaultWriteObject(); // 将大小写到输出流中 s.writeInt(size); // ...