问整型java的键盘输入

EN

// Getting an integer value.
public static int getInt() {
    int numberEntered = 0;
    String entry = "";
    Scanner keyboard = new Scanner(System.in);
    while (!keyboard.hasNextInt()) {
        entry = keyboard.next();
        System.out.println("That is not an integer.  " + "Please try again.");
    }
    numberEntered = Integer.parseInt(entry);
    System.out.print(numberEntered);
    return numberEntered;
}

Error given: k That is not an integer. 
Please try again. 
8 
Exception in thread "main" java.lang.NumberFormatException: For input string: "k" at 
  java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) 
    at java.base/java.lang.Integer.parseInt(Integer.java:652) 
    at java.base/java.lang.Integer.parseInt(Integer.java:770) 
    at Program2.getInt(Program2.java:56) 
    at Program2.problemSelectionMenu(Program2.java:40) 
    at Program2.main(Program2.java:14)