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  • 升序 Collections.sort(list) 降序 Collections.reserve(list) 随机 Collections.shuffle(list)

     1 package Day28ketangzuoye;
     2 
     3 import java.util.ArrayList;
     4 import java.util.Collections;
     5 import java.util.Comparator;
     6 import java.util.HashSet;
     7 import java.util.List;
     8 import java.util.Scanner;
     9 
    10 public class DemoChars{
    11 
    12     public static void main(String[] args) {
    13         Scanner sc=new Scanner(System.in);
    14         System.out.println("请输入N个字符:");
    15         String str=sc.next();
    16         String[] arr=str.split(",");
    17 //        System.out.println(Arrays.toString(arr)); 
    18         
    19         List<String> list=new ArrayList<String>();
    20         for(int i=0;i<arr.length;i++){
    21             list.add(arr[i]);
    22         }
    23         System.out.println("原序输出:  "+list); 
    24         
    25         Collections.sort(list);
    26         System.out.println("升序输出: "+list);
    27         
    28         Collections.sort(list,new Comparator<String>(){
    29             @Override
    30             public int compare(String o1, String o2) {
    31                 return o2.compareTo(o1);
    32             }});
    33         System.out.println("降序输出:   "+list);
    34         
    35         Collections.reverse(list);
    36         System.out.println("反转指定列表中元素的顺序     "+list);
    37         
    38 //        Set set = new ArraySet(list);
    39 //        HashSet<String> set=new HashSet<String>(list);
    40 //        System.out.println("无序输出:  "+set); 
    41 //        升序  Collections.sort(list)    降序  Collections.reserve(list)   随机  Collections.shuffle(list)        
    42         
    43     }
    44 }
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  • 原文地址:https://www.cnblogs.com/1020182600HENG/p/5917462.html
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