public void sort3(){
??List<String> stringList=new ArrayList<String>();
??String s="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
??Random random=new Random();
??for(int i=0;i<10;i++){
???? StringBuffer str=new StringBuffer();?
??do{
????for(int j=0;j<random.nextInt(10);j++){
????int num=random.nextInt(s.length());
????str.append(s.charAt(num));?}
???}while(stringList.contains(str.toString()));
???
???stringList.add(str.toString());}
???
???
??System.out.println("------------排序前-----------------");
??for(String string:stringList){
???System.out.println("字符串為："+string);
??}
??Collections.sort(stringList);
??System.out.println("------------排序后-----------------");
??for(String string:stringList){
???System.out.println("字符串為："+string);
??}
???
???}