Class NumberDisplay

  • public class NumberDisplay
extends java.lang.Object
    We'll write our own version of the book's NumberDisplay class for practice. A NumberDisplay JUST keeps track of a two-digit number. We'll eventually use two of these in the clock -- one for hours and one for minutes.
    Version:
    1.0
    Author:
    Brad Richards

    • Constructor Summary

      Constructors 
      Constructor Description
      NumberDisplay​(int rollOverLimit)
      Constructor that creates a NumberDisplay with the specified upper limit.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.String getDisplayValue()
      Returns a string version of the displayed value.
      int getValue()
      A "getter" that returns the current display value.
      void increment()
      Increment increases the value of the clock by one, wrapping around if necessary.
      void setValue​(int newValue)
      Sets the display to the specified value, as long as the specified value is within the appropriate range.

      • Methods inherited from class java.lang.Object

        clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • NumberDisplay

        public NumberDisplay​(int rollOverLimit)
        Constructor that creates a NumberDisplay with the specified upper limit.
        Parameters:
        rollOverLimit - The value at which the display should roll over.

    • Method Detail

      • increment

        public void increment()
        Increment increases the value of the clock by one, wrapping around if necessary.

      • getDisplayValue

        public java.lang.String getDisplayValue()
        Returns a string version of the displayed value. If it's a single digit, we stick an extra zero in front of it.
        Returns:
        Returns current value as a two-character string.

      • getValue

        public int getValue()
        A "getter" that returns the current display value.
        Returns:
        Current value of NumberDisplay.

      • setValue

        public void setValue​(int newValue)
        Sets the display to the specified value, as long as the specified value is within the appropriate range. Otherwise we print an error message and leave the value unchanged.
        Parameters:
        newValue - A new value that's >= 0 and < roll over limit.