package Day28ketangzuoye;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.Comparator;

 import java.util.HashSet;

 import java.util.List;

 import java.util.Scanner;

 public class DemoChars{

     public static void main(String[] args) {

         Scanner sc=new Scanner(System.in);

         System.out.println("请输入N个字符：");

         String str=sc.next();

         String[] arr=str.split(",");

 //        System.out.println(Arrays.toString(arr)); 

         List<String> list=new ArrayList<String>();

         for(int i=0;i<arr.length;i++){

             list.add(arr[i]);

         }

         System.out.println("原序输出：  "+list); 

         Collections.sort(list);

         System.out.println("升序输出： "+list);

         Collections.sort(list,new Comparator<String>(){

             @Override

             public int compare(String o1, String o2) {

                 return o2.compareTo(o1);

             }});

         System.out.println("降序输出：   "+list);

         Collections.reverse(list);

         System.out.println("反转指定列表中元素的顺序     "+list);

 //        Set set = new ArraySet(list);

 //        HashSet<String> set=new HashSet<String>(list);

 //        System.out.println("无序输出：  "+set);

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

     }

 }