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POJava Homework Help (Accessing Static Member via Instance Reference)
 

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    <p>Here is my homework question: </p> <hr> <p>Write a class declaration for a class “Clock”. It should have instance variables for hours, minutes, seconds (all integers). It should also have a toString() method to show the time in the format shown below. Write a separate “ClockDriver” class to a) create an instance of a clock, b) set the hours, minutes, and seconds for the clock, and c) show the time of the Clock using getTime(). Use the Dog class example on page 36 as a guide. Sample out is shown below:</p> <p>The time is 3:45:00</p> <p>// don’t worry if you can’t get both zeros in </p> <p>// the second field. That is a formatting issue </p> <p>// we will deal with later</p> <hr> <p>Here is my Clock class: </p> <pre><code>class Clock { int hours; int minutes; int seconds; public String toString() { String temp = (""); return temp.format("%02d:%02d:%02d", hours, minutes, seconds); } //end method toString public void getTime() { System.out.print("The time is " + toString()); } //end method getTime } //end class Clock </code></pre> <p>And here is my ClockDriver class: </p> <pre><code>public class ClockDriver { public static void main (String[] args) { Clock c = new Clock(); c.hours = 4; c.minutes = 30; c.seconds = 00; c.getTime(); } //end main } //end class ClockDriver </code></pre> <p>Even though it compiles fine and works nicely, I get what I think is a warning from IDE saying that my </p> <pre><code>return temp.format("%02d:%02d:%02d", hours, minutes, seconds); </code></pre> <p>line is accessing a static member via instance reference. Specifically, the </p> <pre><code>temp.format </code></pre> <p>bit.</p> <p>So my questions are: </p> <p>1.) Why is accessing a static member via instance reference not necessarily encouraged?</p> <p>2.) Is there a better way to put this together so that I'm not accessing a static member via instance reference?</p> <p>Thanks in advance!</p>
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