下面我们将通过一个示例场景来演示如何比较两个List是否一致。假设我们有两个List,分别是list1和list2,我们需要比较它们是否一致。 List<Integer>list1=Arrays.asList(1,2,3,4,5);List<Integer>list2=Arrays.asList(1,2,3,4,5);booleanresult1=compareLists(list1,list2);// 使用循环遍历比较booleanresult2...
importjava.util.ArrayList;importjava.util.List;publicclassCompareLists{publicstaticvoidmain(String[]args){// 1. 创建两个List对象List<Integer>list1=newArrayList<Integer>();List<Integer>list2=newArrayList<Integer>();// 2. 向List中添加元素list1.add(1);list1.add(2);list1.add(3);list2.add(1...
因此,如果使用不可变列表,请考虑将它们包装在ArrayList实例中。 static boolean compareListsIgnoringOrder(ArrayList list1, ArrayList list2) { if (list1 == null || list2 == null) return false; if (list1.size() != list2.size()) return false; for (Object o : list1) { list2.remove(o);...
Note that the difference between two lists is equal to a third list which contains either additional elements or missing elements. 1. Comparing Two Lists for Equality 1.1. Sort then Compare The following Java program tests if two given lists are equal. To test equality, we need to sort both...
此接口对实现它的每个类的对象强加一个默认排序。这种排序被称为类的自然排序,类的compareTo方法被称为其自然比较方法。 Lists (and arrays) of objects that implement this interface can be sorted automatically byCollections.sort(andArrays.sort).
2. With Sets / contains() Check: If the data in our lists are unique i.e. there isn’t a duplication, we can simply create TreeSets from the given lists and then compare them using equals(): public <T extends Comparable<T>> boolean isEquals(List<T> list1, List<T> list2){ if...
toList()); return resultList; } /** * 通过遍历两个List中按id属性相等的归结到resultList中 * @param oneList 源list 1 * @param twoList 源list 2 * @param equalKeyName 相等的map键值 */ public static List<Map<Object, Object>> compareListHitData(List<Map<Object, Object>> oneList, List...
e.2) DescAgeComparator比较器 它是将Person按照age进行降序排序。代码如下: /*** @desc DescAgeComparator比较器 * 它是“Person的age的升序比较器”*/privatestaticclassDescAgeComparatorimplementsComparator<Person>{ @Overridepublicintcompare(Person p1, Person p2) {returnp2.getAge() -p1.getAge(); ...
在实际项目中可能会遇到不相关的表查询结果拼装成一个并按时间倒序排序,然而这样的需求往往用sql不能方便的实现,就需要分别查询出来用List返回,但是返回时需要排序。这时就需要用到List的sort 通过实现Collections.sort的compare接口实现,可排序数字、时间,顺序、倒序 ...
All elements in this list must bemutually comparableusing the specified comparator (that is,c.compare(e1, e2)must not throw aClassCastExceptionfor any elementse1ande2in the list). If the specified comparator isnullthen all elements in this list must implement theComparableinterface and the elemen...