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jAvA ArrAyList 降序排序问题

public static void main(String[] args) { ArrayList arr=new ArrayList(); arr.add(89); arr.add(78); arr.add(56); arr.add(92); arr.add(76); //升序排列; Collections.sort(arr); //逆序输出 Collections.reverse(arr); for(int i=0;i

用Arrays类sort()对数组元素进行降序排列: import java.util.Arrays; class SortDemo { public static void main(String[] args) { int[] vec={0,15,-14,45,20,70}; Arrays.sort(vec); System.out.println("/n"); System.out.println("降序排列...

看代码: import java.util.ArrayList;import java.util.Arrays;import java.util.Collections;public class Demo {public static void main(String[] args) throws Exception {Pair[] pairs = {new Pair(0, 1),new Pair(2, 9),new Pair(7, 0),n...

public static void main(String args[]) { ArrayList list = new ArrayList(); for (int i = 0; i < 10; i++) { list.add((int) (Math.random() * 100)); } Collections.sort(list); System.out.println(Arrays.toString(list.toArray())); }

有几个方法可以实现:让 Student 实现Comparable接口,或是实例化一个比较器, 现在用 Comparator 比较器实例来做一个:ComparableTest.java import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; public c...

举得案列不明显

方法一:实现Comparable接口排序package collsort.comparable; package com.cvicse.sort.comparable; public class Cat implements Comparable { private int age; private String name; public Cat(int age, String name) { this.age = age; th...

用Collections.reverse(list)即可。如: List list = Arrays.asList(new String[] {"aa", "bb", "cc", "dd", "ee"}); Collections.reverse(list); for (String string : list) { System.out.println(string); }

只有实现Comparable接口的类才能实现排序功能,Number并无实现此接口,但是基本上Number的大多数子类都有实现此接口。不过你可以试试下面的方法,有点麻烦,不过应该可以 public static void ascending(List list) {Collections.sort(list, new ...

import java.util.*;public class Example{public static void main(String arg[]){ArrayList st = new ArrayList(Arrays.asList(("癸,乙,辛,丙,甲,壬,戊,己,丁,庚").split(",")));for(String i:st)System.out.format("%s",i);System.out.format...

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