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...
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...
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. Additionally,f...
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...
StreamSetListStreamSetListConvert List to SetRemove DuplicatesCreate Stream from ListFilter Duplicates 这个序列图简洁地表达了从列表到集合,并去除重复元素的过程。 饼状图 去重操作对于集合数据的处理效率有着显著影响。以下是一个饼状图,表示在数据处理过程中,去重操作所占的时间与不开销的时间比例: ...
Java 8 examples to count the duplicates in a stream and remove the duplicates from the stream. We will use a List to provide Stream of items.
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 ...
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; ...
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); // ...