package?com.imooc.collection;

import?java.util.ArrayList;
import?java.util.Collections;
import?java.util.List;
import?java.util.Random;

public?class?CollectionsTask?{
????public?void?collectionSort(){
????????List<String>?stringList=new?ArrayList<String>();
????????String?str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
????????Random?random=new?Random();
????????for(int?i=0;i<10;i++){
????????????StringBuffer?sb;
????????????do{sb=new?StringBuffer();
????????????int?length=random.nextInt(9)+1;
????????????for?(int?j=0;j<length;j++){
????????????????int?num=random.nextInt(62);
????????????????sb.append(str.charAt(num));
????????????}}while(stringList.contains(sb));
????????????System.out.println("將要添加字符串：'"+sb+"'");
????????????stringList.add(sb.toString());
????????}

????????System.out.println("------------排序前------------");
????????for?(String?string:stringList)?{
????????????System.out.println("元素："+string);
????????}
????????Collections.sort(stringList);
????????System.out.println("------------排序后------------");
????????for?(String?string:stringList)?{
????????????System.out.println("元素："+string);
????????}
????}

????public?static?void?main(String[]?args)?{
????????CollectionsTask?collectionsTask=new?CollectionsTask();
????????collectionsTask.collectionSort();
????}

????}