Class NumberDisplay

  • public class NumberDisplay
extends java.lang.Object
    The NumberDisplay class represents a digital number display that can hold values from zero to a given limit. The limit can be specified when creating the display. The values range from zero (inclusive) to limit-1. If used, for example, for the seconds on a digital clock, the limit would be 60, resulting in display values from 0 to 59. When incremented, the display automatically rolls over to zero when reaching the limit.
    Version:
    2016.02.29
    Author:
    Michael Kölling and David J. Barnes

    • Constructor Summary

      Constructors 
      Constructor Description
      NumberDisplay​(int rollOverLimit)
      Constructor for objects of class NumberDisplay.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.String getDisplayValue()
      Return the display value (that is, the current value as a two-digit String.
      int getValue()
      Return the current value.
      void increment()
      Increment the display value by one, rolling over to zero if the limit is reached.
      void setValue​(int replacementValue)
      Set the value of the display to the new specified value.

      • 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 for objects of class NumberDisplay. Set the limit at which the display rolls over.

    • Method Detail

      • getValue

        public int getValue()
        Return the current value.

      • getDisplayValue

        public java.lang.String getDisplayValue()
        Return the display value (that is, the current value as a two-digit String. If the value is less than ten, it will be padded with a leading zero).

      • setValue

        public void setValue​(int replacementValue)
        Set the value of the display to the new specified value. If the new value is less than zero or over the limit, do nothing.

      • increment

        public void increment()
        Increment the display value by one, rolling over to zero if the limit is reached.