其余输入变为无效

Question

所以我得到这段代码来检查输入是否为int：

    public static int getInt(){
    boolean bool = true;
    int answerInt = 0;
    while(bool == true){
        try{
            answerInt = sc.nextInt();
            bool = false;
        }catch(InputMismatchException e){
            System.out.println("Error");
            break;

        }
    }
    return answerInt;
}

因此，如果用户输入无效的内容，则程序中的其余输入将变为＆＃34; null＆＃34;。为什么会发生这种情况，我该如何解决？

Answer 1

public static int getInt() {

    Scanner sc = new Scanner(System.in);

    boolean bool = true;
    int answerInt = 0;

    System.out.println("Enter an int");

    while (bool) {
        try {
            answerInt = sc.nextInt();
            bool = false;
            sc.close(); 
        } catch (InputMismatchException e) {
            System.out.println("Try again");
            sc.next(); //Can you figure out why this line is needed?
        }

    }

    return answerInt;

}