java - 如何验证输入是否为 Int 且在数字范围内？

Question

程序显示一个问题，用户需要输入数字 1 到 5。5 个用户有 5 个问题。但是，程序无法识别输入的好坏，只要它是 Int 即可。我必须输入多次才能再次运行 Survey.presentQuestions() 。我不明白为什么。

    for (int i = 0; i < 5; i++) 
            {
                for (int j = 0; j < 5; j++) 
                {
                    Survey.presentQuestion(j, i);
                    do{
                        TempAns = in.nextInt();
                        while (!(in.hasNextInt()))
                        {
                            System.out.println("Please enter integer value from 1 to 5!");
                            in.next();
                        }
                    }while(TempAns >= 1 && TempAns <= 5);
                    Survey.ResultArray[i][j] = TempAns;

                }
            }

Answer 1

更新试试这个

 for (int i = 0; i < 5; i++) {
    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 5; j++) {
            System.out.println("Student: "+(i+1)+" Grade: "+(j+1));
            System.out.println("Please enter integer value from 1 to 5!");
            TempAns = getNumber();
        }
    }

还有另一种方法

 public int getNumber(){
    Scanner in =new Scanner(System.in);
    int validatedNumber;
    do{


    try{
        String toValidate=in.next();
        validatedNumber= Integer.parseInt(toValidate);
        if (validatedNumber>0 && validatedNumber<6){
            return validatedNumber;
        }else{
            System.out.println("Between 1 and 5!!");
        }
    }catch(Exception e){
        System.out.println("You have to chose a number!");
    }
    }while(true);

}