幫忙看看什么問題，老是報調試，還有排序后面的不顯示

如題suo shi

14:40

石三春

2017-07-17

源自：Java入門第三季 6-5

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qq_繼承了D之意志的男人_0
2017-07-25

?public?void?testsort3()?{
????	??String?a="0123456789qwertyuiopasdfghjklzxcvbnmQWERTYIOPASDFGHJKLzxcvbnm";
????	??Random?rd=new?Random();????	??
????	?List<String>stringList=new?ArrayList<String>();
????	??for(int?i=0;i<10;i++)?{
????		??StringBuilder?sb=new?StringBuilder();?
????		??for(int?j=0;j<1+rd.nextInt(10);j++)?{
????			??char?cr=a.charAt((int)(rd.nextInt(62)));
????			??sb=sb.append(String.valueOf(cr));
????		??}??			
??			?System.out.println("獲得字符串："+sb);
??			?stringList.add(sb.toString());
????	??}
????	??System.out.println("-------排序前---------");
????	??for?(String?string?:stringList)?{
??			System.out.println("元素："+string);
????	??}
????	??System.out.println("-------排序后---------");
????	??Collections.sort(stringList);
????	??for?(String?string?:stringList)?{
??			System.out.println("元素："+string);
????	??}
????	??
??????}