JAVA how to loop ask if a number is an enter? Please help asap

     x = input.nextInt();


    while(!input.hasNextInt(x)){
        System.out.println("Enter a valid int");
        x = input.nextInt();
    }
       while(x <=0 || x > 3){
             System.out.println("Choose a correct gear number: ");

             x = input.nextInt();
        } 
        switch(x){

            case 1:
            System.out.println("You're in Gear 1");
                break;
            case 2:
            System.out.println("Gear 2");
                break;
            case 3:
            System.out.println("Gear3");

        } 
      } 

I cant figure out how to continuously loop asking for an int while x doesnt = an int. Ive tried so many thing. Everytime I enter a letter or a letter number combination like Q or 23k or 2k etc... I get a mismatch error. I want to be able to check if the use is inputting something they shouldnt in my methods.