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<div class="subTitle">org.apache.commons.lang3.time</div>
<h2 title="Class StopWatch" class="title">Class StopWatch</h2>
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<ul class="inheritance">
<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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<li>org.apache.commons.lang3.time.StopWatch</li>
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<pre>public class <span class="strong">StopWatch</span>
extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block"><p>
<code>StopWatch</code> provides a convenient API for timings.
</p>
<p>
To start the watch, call <a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#start()"><code>start()</code></a>. At this point you can:
</p>
<ul>
<li><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#split()"><code>split()</code></a> the watch to get the time whilst the watch continues in the background. <a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#unsplit()"><code>unsplit()</code></a> will
remove the effect of the split. At this point, these three options are available again.</li>
<li><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#suspend()"><code>suspend()</code></a> the watch to pause it. <a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#resume()"><code>resume()</code></a> allows the watch to continue. Any time between the
suspend and resume will not be counted in the total. At this point, these three options are available again.</li>
<li><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#stop()"><code>stop()</code></a> the watch to complete the timing session.</li>
</ul>
<p>
It is intended that the output methods <a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#toString()"><code>toString()</code></a> and <a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#getTime()"><code>getTime()</code></a> should only be called after stop,
split or suspend, however a suitable result will be returned at other points.
</p>
<p>
NOTE: As from v2.1, the methods protect against inappropriate calls. Thus you cannot now call stop before start,
resume before suspend or unsplit before split.
</p>
<p>
1. split(), suspend(), or stop() cannot be invoked twice<br>
2. unsplit() may only be called if the watch has been split()<br>
3. resume() may only be called if the watch has been suspend()<br>
4. start() cannot be called twice without calling reset()
</p>
<p>This class is not thread-safe</p></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>2.0</dd>
<dt><span class="strong">Version:</span></dt>
<dd>$Id: StopWatch.java 1591488 2014-04-30 21:49:35Z ggregory $</dd></dl>
</li>
</ul>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#StopWatch()">StopWatch</a></strong>()</code>
<div class="block">
Constructor.</div>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#getNanoTime()">getNanoTime</a></strong>()</code>
<div class="block">
Get the time on the stopwatch in nanoseconds.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#getSplitNanoTime()">getSplitNanoTime</a></strong>()</code>
<div class="block">
Get the split time on the stopwatch in nanoseconds.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#getSplitTime()">getSplitTime</a></strong>()</code>
<div class="block">
Get the split time on the stopwatch.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#getStartTime()">getStartTime</a></strong>()</code>
<div class="block">Returns the time this stopwatch was started.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#getTime()">getTime</a></strong>()</code>
<div class="block">
Get the time on the stopwatch.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#isStarted()">isStarted</a></strong>()</code>
<div class="block">
The method is used to find out if the StopWatch is started.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#isStopped()">isStopped</a></strong>()</code>
<div class="block">
This method is used to find out whether the StopWatch is stopped.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#isSuspended()">isSuspended</a></strong>()</code>
<div class="block">
This method is used to find out whether the StopWatch is suspended.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#reset()">reset</a></strong>()</code>
<div class="block">
Resets the stopwatch.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#resume()">resume</a></strong>()</code>
<div class="block">
Resume the stopwatch after a suspend.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#split()">split</a></strong>()</code>
<div class="block">
Split the time.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#start()">start</a></strong>()</code>
<div class="block">
Start the stopwatch.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#stop()">stop</a></strong>()</code>
<div class="block">
Stop the stopwatch.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#suspend()">suspend</a></strong>()</code>
<div class="block">
Suspend the stopwatch for later resumption.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#toSplitString()">toSplitString</a></strong>()</code>
<div class="block">
Gets a summary of the split time that the stopwatch recorded as a string.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#toString()">toString</a></strong>()</code>
<div class="block">
Gets a summary of the time that the stopwatch recorded as a string.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#unsplit()">unsplit</a></strong>()</code>
<div class="block">
Remove a split.</div>
</td>
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<h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li>
</ul>
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<h4>StopWatch</h4>
<pre>public StopWatch()</pre>
<div class="block"><p>
Constructor.
</p></div>
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<h4>start</h4>
<pre>public void start()</pre>
<div class="block"><p>
Start the stopwatch.
</p>
<p>
This method starts a new timing session, clearing any previous values.
</p></div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if the StopWatch is already running.</dd></dl>
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<h4>stop</h4>
<pre>public void stop()</pre>
<div class="block"><p>
Stop the stopwatch.
</p>
<p>
This method ends a new timing session, allowing the time to be retrieved.
</p></div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if the StopWatch is not running.</dd></dl>
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<h4>reset</h4>
<pre>public void reset()</pre>
<div class="block"><p>
Resets the stopwatch. Stops it if need be.
</p>
<p>
This method clears the internal values to allow the object to be reused.
</p></div>
</li>
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<h4>split</h4>
<pre>public void split()</pre>
<div class="block"><p>
Split the time.
</p>
<p>
This method sets the stop time of the watch to allow a time to be extracted. The start time is unaffected,
enabling <a href="../../../../../org/apache/commons/lang3/time/StopWatch.html#unsplit()"><code>unsplit()</code></a> to continue the timing from the original start point.
</p></div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if the StopWatch is not running.</dd></dl>
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<h4>unsplit</h4>
<pre>public void unsplit()</pre>
<div class="block"><p>
Remove a split.
</p>
<p>
This method clears the stop time. The start time is unaffected, enabling timing from the original start point to
continue.
</p></div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if the StopWatch has not been split.</dd></dl>
</li>
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<a name="suspend()">
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<h4>suspend</h4>
<pre>public void suspend()</pre>
<div class="block"><p>
Suspend the stopwatch for later resumption.
</p>
<p>
This method suspends the watch until it is resumed. The watch will not include time between the suspend and
resume calls in the total time.
</p></div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if the StopWatch is not currently running.</dd></dl>
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<h4>resume</h4>
<pre>public void resume()</pre>
<div class="block"><p>
Resume the stopwatch after a suspend.
</p>
<p>
This method resumes the watch after it was suspended. The watch will not include time between the suspend and
resume calls in the total time.
</p></div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if the StopWatch has not been suspended.</dd></dl>
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<h4>getTime</h4>
<pre>public long getTime()</pre>
<div class="block"><p>
Get the time on the stopwatch.
</p>
<p>
This is either the time between the start and the moment this method is called, or the amount of time between
start and stop.
</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the time in milliseconds</dd></dl>
</li>
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<h4>getNanoTime</h4>
<pre>public long getNanoTime()</pre>
<div class="block"><p>
Get the time on the stopwatch in nanoseconds.
</p>
<p>
This is either the time between the start and the moment this method is called, or the amount of time between
start and stop.
</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the time in nanoseconds</dd><dt><span class="strong">Since:</span></dt>
<dd>3.0</dd></dl>
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<h4>getSplitTime</h4>
<pre>public long getSplitTime()</pre>
<div class="block"><p>
Get the split time on the stopwatch.
</p>
<p>
This is the time between start and latest split.
</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the split time in milliseconds</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if the StopWatch has not yet been split.</dd><dt><span class="strong">Since:</span></dt>
<dd>2.1</dd></dl>
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<h4>getSplitNanoTime</h4>
<pre>public long getSplitNanoTime()</pre>
<div class="block"><p>
Get the split time on the stopwatch in nanoseconds.
</p>
<p>
This is the time between start and latest split.
</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the split time in nanoseconds</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if the StopWatch has not yet been split.</dd><dt><span class="strong">Since:</span></dt>
<dd>3.0</dd></dl>
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<h4>getStartTime</h4>
<pre>public long getStartTime()</pre>
<div class="block">Returns the time this stopwatch was started.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the time this stopwatch was started</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if this StopWatch has not been started</dd><dt><span class="strong">Since:</span></dt>
<dd>2.4</dd></dl>
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<h4>toString</h4>
<pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> toString()</pre>
<div class="block"><p>
Gets a summary of the time that the stopwatch recorded as a string.
</p>
<p>
The format used is ISO 8601-like, <i>hours</i>:<i>minutes</i>:<i>seconds</i>.<i>milliseconds</i>.
</p></div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a></code> in class <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the time as a String</dd></dl>
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<h4>toSplitString</h4>
<pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> toSplitString()</pre>
<div class="block"><p>
Gets a summary of the split time that the stopwatch recorded as a string.
</p>
<p>
The format used is ISO 8601-like, <i>hours</i>:<i>minutes</i>:<i>seconds</i>.<i>milliseconds</i>.
</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the split time as a String</dd><dt><span class="strong">Since:</span></dt>
<dd>2.1</dd></dl>
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<pre>public boolean isStarted()</pre>
<div class="block"><p>
The method is used to find out if the StopWatch is started. A suspended
StopWatch is also started watch.
</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>boolean
If the StopWatch is started.</dd><dt><span class="strong">Since:</span></dt>
<dd>3.2</dd></dl>
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<pre>public boolean isSuspended()</pre>
<div class="block"><p>
This method is used to find out whether the StopWatch is suspended.
</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>boolean
If the StopWatch is suspended.</dd><dt><span class="strong">Since:</span></dt>
<dd>3.2</dd></dl>
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<pre>public boolean isStopped()</pre>
<div class="block"><p>
This method is used to find out whether the StopWatch is stopped. The
stopwatch which's not yet started and explicitly stopped stopwatch is
considered as stopped.
</p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>boolean
If the StopWatch is stopped.</dd><dt><span class="strong">Since:</span></dt>
<dd>3.2</dd></dl>
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