public?void?test2()?{	
List<String>?list2=new?ArrayList<String>();
String?abc="qwertyuiopasdfghjklzxcvbnm1234567890";
Random?random=new?Random();
int?abcLength=abc.length();
for(int?i=0;i<10;i++)?{	
????String?str="";			
????do{for(int?j=0;j<10;i++)?{				
????int?abcGet=random.nextInt(abcLength);				
????str=str+abc.charAt(abcGet);			
????}}while(list2.contains(str));			
????list2.add(str);		
????}		
????System.out.println("—————之前—————");		
????for(String?s:list2)?{			
????System.out.println(s);		
????}		
????Collections.sort(list2);		
????System.out.println("—————之后—————");		
????for(String?s:list2)?{			
????System.out.println(s);	??????		
????}	}