COS126

• Download PlayTime.java

/*****************************************************************************
 * Name:
 * NetID:
 * Precept:
 *
 * Description: Example program to declare and initialize two Stopwatch objects.
 * Then swap them by merely swapping the reference names.
 *
 * Dependencies: Stopwatch.java, StdOut.java
 ****************************************************************************/

public class PlayTime {
    public static void main(String[] args) {
        Stopwatch watchOne = new Stopwatch();
 
        // waste time so it is large enough to be measurable
        for (int i = 0; i < 1e8; i++);
        
        Stopwatch watchTwo = new Stopwatch(); 
 
        // waste time so it is large enough to be measurable
        for (int i = 0; i < 1e8; i++);

        // right now, watchOne is older
        StdOut.println("watchOne " + watchOne.elapsedTime());
        StdOut.println("watchTwo " + watchTwo.elapsedTime());
        
        Stopwatch watchTmp = watchOne;
        watchOne = watchTwo;
        watchTwo = watchTmp; 

        // swapped! now watchTwo is the older one
        // e.g. watchTwo.elapsedTime() returns a value
        // (slightly) larger than watchOne.elapsedTime()
        StdOut.println("watchOne " + watchOne.elapsedTime());
        StdOut.println("watchTwo " + watchTwo.elapsedTime());
    }
}