java - 嵌套在 do-while 循环中的 try-catch 没有实际循环是否有原因？

Question

我有一个简单的 switch-case 嵌套在 do while 循环中。在我的代码中，因此 switch case 的输入是通过用户进行的。所以我试图捕获一个InputMismatchException，然后循环继续{再次循环}，但它停止了一切。如何让它继续循环？

   public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("Equation Solver");          
        char ch;
        do
        {
            try{
            System.out.println("\nPlease choose\n");
            System.out.println("1. Suvat Equations");
            System.out.println("2. Energy Equations");
            System.out.println("3. The Doppler Effect Calculations");
            System.out.println("4. Gravitational Force Equation");
            System.out.println("5. Support");
            System.out.println("6. Graph");

            int choice = scan.nextInt();

            switch (choice)
            {
             case 1 : 
                System.out.println("\nPlease choose according to the variable you want to find\n");
                System.out.println("1. Initial Velocity");
                System.out.println("2. Final Velocity");
                System.out.println("3. Acceleration");
                System.out.println("4. Distance Travelled");
                System.out.println("5. Time Taken");
                System.out.println("6. Otherwise Cancel");

                try{ 
                    int choiceCase1 = scan.nextInt();

                    switch(choiceCase1){
                        case 1 :
                            System.out.println("Please ");
                            Equation1();
                            break;
                        case 2 :
                            Equation1();
                            break;
                        case 3 :
                            Equation1();
                            break;
                        case 4 :
                            Equation1();
                            break;  
                        case 5 :
                            Equation1();
                            break;
                        case 6 :
                            break; 
                        default :
                            System.out.println("Wrong Entry \n ");
                            break;    
                    }



                }catch (InputMismatchException e){
                        System.out.println("please stop");
                 }

            case 2 : 
                Equation1();                     
                break;                          
            case 3 : 
                System.out.println("Enter integer element to insert");

                break;                         
            case 4 : 
                System.out.println("Enter integer element to insert");

                break;                                          
            case 5 : 

                break;     
            case 6 : 

                break;            
            default : 
                System.out.println("Wrong Entry \n ");
                break;   
            }    
            } catch (InputMismatchException s){
                System.out.println("Caught Exception")
            } finally{

            System.out.println("\nDo you want to continue (Type y or n) \n");
            ch = scan.next().charAt(0);    
            }
        } while (ch == 'Y'|| ch == 'y'); 

        }

我希望用户能够输入 y 然后重复循环，但不允许这样做

Answer 1

来自:https://www.tutorialspoint.com/java/java_break_statement.htm

When the break statement is encountered inside a loop, the loop is immediately terminated and the program control resumes at the next statement following the loop.

您的中断声明位于:

    } catch (InputMismatchException s){
        break;
    }

正在结束循环。

编辑:此 try/catch 语句位于 switch 语句之外。所以break不是退出switch语句，而是退出循环。