List.equals和CollectionUtils.isEqualCollection的区别

张紫娃2024-10-20 13:58

List 的 equals() .首先比较两个列表大小是否相等。如果大小相等再逐个比较元素是否相等。

java 复制代码

<dependency>
    <groupId>commons-collections</groupId>
    <artifactId>commons-collections</artifactId>
    <version>3.2.2</version>
</dependency>

csharp 复制代码

# Person未覆写了equals
Person per1 = new Person("name1");
Person per2 = new Person("name2");
List<Person> list1 = new ArrayList<Person>();
list1.add(per1);
list1.add(per2);
Person per3 = new Person("name1");
Person per4 = new Person("name2");
List<Person> list2 = new ArrayList<Person>();
list2.add(per3);
list2.add(per4);

System.out.println(list1.equals(list2)); // false
System.out.println(CollectionUtils.isEqualCollection(list1, list2)); //false


# Person加@Data覆写了equals
Person per1 = new Person("name1");
Person per2 = new Person("name2");
List<Person> list1 = new ArrayList<Person>();
list1.add(per1);
list1.add(per2);
Person per3 = new Person("name1");
Person per4 = new Person("name2");
List<Person> list2 = new ArrayList<Person>();
list2.add(per3);
list2.add(per4);

System.out.println(list1.equals(list2)); // true
System.out.println(CollectionUtils.isEqualCollection(list1, list2)); //true

参考

List.equals和CollectionUtils.isEqualCollection的区别