Since Comparator is a functional interface, we can use lambda expressions to write its implementation in a single line.Collections.sort(dl, (d1, d2) -> { return d2.getId() - d1.getId(); }); System.out.println("Reverse Sorted List using Comparator::" + dl); Output:Java Sort List...
public static <T> void sort(List<T> list, Comparator<? super T> c) package cn.tedu.collection_two; import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.Random; /** * 使用Collections集合工具类所提供的sort方法对集合进行排序, * sort方...
*@implNote* This implementation defers to the {@linkList#sort(Comparator)} * method using the specified list and comparator. * *@param<T> the class of the objects in the list *@paramlist the list to be sorted. *@paramc the comparator to determine the order of the list. A * {@cod...
vals.sort(Comparator.naturalOrder()); System.out.println(vals); vals.sort(Comparator.reverseOrder()); System.out.println(vals); } The integers are sorted in ascending and descending orders. The data is sorted in-place; i.e. the original list is modified. $ java Main.java [-4, -2, -...
JAVA中Arrays.sort()使用两种方式(Comparable和Comparator接口)对对象或者引用进行排序. Comparable接口 让待排序对象所在的类实现Comparable接口,并重写Comparable接口中的compareTo()方法,缺点是只能按照一种规则排序。 Comparator接口 编写多个排序方式类实现Comparator接口,并重写新Comparator接口中的compare()方法,在调用Array...
进入List中查看sort方法源码如下: default void sort(Comparator<? super E> c) { Object[] a = this.toArray(); // 这个方法很简单,就是调用Arrays中的sort方法进行排序 Arrays.sort(a, (Comparator) c); ListIterator<E> i = this.listIterator(); ...
ThenaturalOrder()function will sort the elements in ascending order. See the code given below. importjava.util.*;importjava.util.stream.*;publicclassMain{publicstaticvoidmain(String[]args){List<Integer>slist=Arrays.asList(4,5,1,2,8,9,6);slist.sort(Comparator.naturalOrder());System.out.pri...
Java Copy In this example, we’ve created a customComparatorthat comparesPersonobjects based on their names. We then pass thisComparatorto theCollections.sort()method to sort our list of people. The output shows the names of the people in alphabetical order. ...
Use Streamsorted()to Sort a List in Reverse Order in Java We can also provide the order in which the sorting takes place. To get the output or sorted stream in reversed order, specify it inside thesortedmethod by telling the comparator to use the reverse order. ...
java中List集合日期排序(Collections.sort排序) 1、集合中有日期字段想排序 privatestaticvoidlistSorts(List list) { Collections.sort(list,newComparator() { SimpleDateFormat sf=newSimpleDateFormat("yyyy-MM-dd HH:mm:ss"); @Overridepublicintcompare(Object o1, Object o2) {try{ ...