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public class Rolex {
private final long start;
public Rolex() {
start = System.currentTimeMillis();
}
// return time (in seconds) since this object was created
public double elapsedTime() {
long now = System.currentTimeMillis();
return (now - start) / 1000.0;
}
public static void main(String[] args) {
Rolex watchOne = new Rolex();
// waste time so it is large enough to be measurable
try {Thread.sleep(500);} catch (InterruptedException e) {}
Rolex watchTwo = new Rolex();
// waste time so it is large enough to be measurable
try {Thread.sleep(500);} catch (InterruptedException e) {}
// right now, watchOne is older
System.out.println("watchOne " + watchOne.elapsedTime());
System.out.println("watchTwo " + watchTwo.elapsedTime());
Rolex 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()
System.out.println("watchOne " + watchOne.elapsedTime());
System.out.println("watchTwo " + watchTwo.elapsedTime());
}
}
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