程序不再运行

Question

我已经用Java制作了一个计算器，它工作正常，但是存在一个问题，我正在使用do while循环询问用户是否要再次运行代码，但是每当我输入Y / y时，它就永远不会再次运行程序它只是结束程序请帮助我

    double Fnum;
    double Snum;
    String Choose;
    do {  
    System.out.println("Press 1 for sum\n" + "press 2 for subtraction\n" 
                       + "press 3 for multiplication\n" + "press 4 for division\n" 
                        + "and 5 to see table");
     Scanner input = new Scanner(System.in);
     int n = input.nextInt();

   if(n==1) {
       System.out.println("Please enter first  num");
       Scanner Cal= new Scanner(System.in);
       Fnum = Cal.nextInt();
       System.out.println("Please enter Second num");
       Snum = Cal.nextInt();
       double Sum = Fnum  + Snum;
       System.out.println(Sum);
   }
   else if(n==2) {
       System.out.println("Please enter first  num");
       Scanner Cal= new Scanner(System.in);
       Fnum = Cal.nextInt();
       System.out.println("Please enter Second num");
       Snum = Cal.nextInt();
       double Sub = Fnum  - Snum;
       System.out.println(Sub);
   }
   else if(n==3) {
       System.out.println("Please enter first  num");
       Scanner Cal= new Scanner(System.in);
       Fnum = Cal.nextInt();
       System.out.println("Please enter Second num");
       Snum = Cal.nextInt();
       double Mul = Fnum  * Snum;
       System.out.println(Mul);
}


   System.out.println("Continue(Y/N)");
   Scanner ans = new Scanner(System.in);
   Choose = ans.next();

   }while(Choose =="Y" || Choose =="y") ;

} }