測試類package?Library; import?java.util.Scanner; public?class?Tushuguan?{ public?static?void?main(String[]?args)?{ System.out.println("1-按照書名查詢信息"+"2-按照序號查詢信息"); try{ Scanner?inqut=new?Scanner(System.in); int?num=inqut.nextInt();} ???? ????catch(Exception?e){ ???? System.out.println("請輸入數字1或者2進行查詢"); ???? System.out.println("請重新輸入"); ???? Scanner?in?=?new?Scanner(System.in); ???? int?sum=in.nextInt(); ???? ????try{????switch(sum){ ???? case?1: ???? shuming?one=new?shuming(); ???? String?name1=one.Book(); ???? break; ????} } ???? catch(Exception?a){ ???? a.printStackTrace(); ???? System.out.println("請輸入正確的書名"+"\n請重新輸入"); ???? Scanner?on?=?new?Scanner(System.in); ???? String?name=on.next(); ???? } ???? ???? ???? ????}}} shuming類package?Library; import?java.util.Scanner; import?java.util.Arrays; public?class?shuming?{ public?String?Book()?throws?Exception{ String?[]?book=new?String[]{"Thank?in?Java","Head?First?In?Java","C?pro"}; System.out.println(Arrays.toString(book)); String?name; try?{ Scanner?inqut=new?Scanner(System.in); name?=?inqut.next(); }?catch?(Exception?e)?{ //?TODO?Auto-generated?catch?block e.printStackTrace(); throw?e; } ???? return?name; } }請問為什么我的測試類正常運行輸入1的時候 程序就結束了而輸入出現錯誤的時候重新輸入1 她才展示出來shuming類中的調用？？