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<h2 title="Class LineIterator" class="title">Class LineIterator</h2>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<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>&gt;</dd>
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<pre>public class <span class="typeNameLabel">LineIterator</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>
implements <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<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>&gt;, <a href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></pre>
<div class="block">An Iterator over the lines in a <code>Reader</code>.
 <p>
 <code>LineIterator</code> holds a reference to an open <code>Reader</code>.
 When you have finished with the iterator you should close the reader
 to free internal resources. This can be done by closing the reader directly,
 or by calling the <a href="../../../../org/apache/commons/io/LineIterator.html#close--"><code>close()</code></a> or <a href="../../../../org/apache/commons/io/LineIterator.html#closeQuietly-org.apache.commons.io.LineIterator-"><code>closeQuietly(LineIterator)</code></a>
 method on the iterator.
 <p>
 The recommended usage pattern is:
 <pre>
 LineIterator it = FileUtils.lineIterator(file, "UTF-8");
 try {
   while (it.hasNext()) {
     String line = it.nextLine();
     // do something with line
   }
 } finally {
   it.close();
 }
 </pre></div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.2</dd>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/io/LineIterator.html#LineIterator-java.io.Reader-">LineIterator</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/Reader.html?is-external=true" title="class or interface in java.io">Reader</a>&nbsp;reader)</code>
<div class="block">Constructs an iterator of the lines for a <code>Reader</code>.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/io/LineIterator.html#close--">close</a></span>()</code>
<div class="block">Closes the underlying <code>Reader</code>.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/io/LineIterator.html#closeQuietly-org.apache.commons.io.LineIterator-">closeQuietly</a></span>(<a href="../../../../org/apache/commons/io/LineIterator.html" title="class in org.apache.commons.io">LineIterator</a>&nbsp;iterator)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">As of 2.6 removed without replacement. Please use the try-with-resources statement or handle
 suppressed exceptions manually.</span></div>
</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/io/LineIterator.html#hasNext--">hasNext</a></span>()</code>
<div class="block">Indicates whether the <code>Reader</code> has more lines.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/io/LineIterator.html#isValidLine-java.lang.String-">isValidLine</a></span>(<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>&nbsp;line)</code>
<div class="block">Overridable method to validate each line that is returned.</div>
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<tr id="i4" 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><span class="memberNameLink"><a href="../../../../org/apache/commons/io/LineIterator.html#next--">next</a></span>()</code>
<div class="block">Returns the next line in the wrapped <code>Reader</code>.</div>
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<tr id="i5" 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><span class="memberNameLink"><a href="../../../../org/apache/commons/io/LineIterator.html#nextLine--">nextLine</a></span>()</code>
<div class="block">Returns the next line in the wrapped <code>Reader</code>.</div>
</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/io/LineIterator.html#remove--">remove</a></span>()</code>
<div class="block">Unsupported.</div>
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<h3>Methods inherited from interface&nbsp;java.util.<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a></h3>
<code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true#forEachRemaining-java.util.function.Consumer-" title="class or interface in java.util">forEachRemaining</a></code></li>
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<h4>LineIterator</h4>
<pre>public&nbsp;LineIterator(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/Reader.html?is-external=true" title="class or interface in java.io">Reader</a>&nbsp;reader)
             throws <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></pre>
<div class="block">Constructs an iterator of the lines for a <code>Reader</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>reader</code> - the <code>Reader</code> to read from, not null</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if the reader is null</dd>
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<h4>hasNext</h4>
<pre>public&nbsp;boolean&nbsp;hasNext()</pre>
<div class="block">Indicates whether the <code>Reader</code> has more lines.
 If there is an <code>IOException</code> then <a href="../../../../org/apache/commons/io/LineIterator.html#close--"><code>close()</code></a> will
 be called on this instance.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true#hasNext--" title="class or interface in java.util">hasNext</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<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>&gt;</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if the Reader has more lines</dd>
<dt><span class="throwsLabel">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 an IO exception occurs</dd>
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<h4>isValidLine</h4>
<pre>protected&nbsp;boolean&nbsp;isValidLine(<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>&nbsp;line)</pre>
<div class="block">Overridable method to validate each line that is returned.
 This implementation always returns true.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>line</code> - the line that is to be validated</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if valid, false to remove from the iterator</dd>
</dl>
</li>
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<h4>next</h4>
<pre>public&nbsp;<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>&nbsp;next()</pre>
<div class="block">Returns the next line in the wrapped <code>Reader</code>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true#next--" title="class or interface in java.util">next</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<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>&gt;</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the next line from the input</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/NoSuchElementException.html?is-external=true" title="class or interface in java.util">NoSuchElementException</a></code> - if there is no line to return</dd>
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<h4>nextLine</h4>
<pre>public&nbsp;<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>&nbsp;nextLine()</pre>
<div class="block">Returns the next line in the wrapped <code>Reader</code>.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the next line from the input</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/NoSuchElementException.html?is-external=true" title="class or interface in java.util">NoSuchElementException</a></code> - if there is no line to return</dd>
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<h4>close</h4>
<pre>public&nbsp;void&nbsp;close()
           throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Closes the underlying <code>Reader</code>.
 This method is useful if you only want to process the first few
 lines of a larger file. If you do not close the iterator
 then the <code>Reader</code> remains open.
 This method can safely be called multiple times.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true#close--" title="class or interface in java.io">close</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if closing the underlying <code>Reader</code> fails.</dd>
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<h4>remove</h4>
<pre>public&nbsp;void&nbsp;remove()</pre>
<div class="block">Unsupported.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true#remove--" title="class or interface in java.util">remove</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<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>&gt;</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</a></code> - always</dd>
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<h4>closeQuietly</h4>
<pre><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public static&nbsp;void&nbsp;closeQuietly(<a href="../../../../org/apache/commons/io/LineIterator.html" title="class in org.apache.commons.io">LineIterator</a>&nbsp;iterator)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">As of 2.6 removed without replacement. Please use the try-with-resources statement or handle
 suppressed exceptions manually.</span></div>
<div class="block">Closes a <code>LineIterator</code> quietly.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>iterator</code> - The iterator to close, or <code>null</code>.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html?is-external=true#addSuppressed-java.lang.Throwable-" title="class or interface in java.lang"><code>Throwable.addSuppressed(java.lang.Throwable)</code></a></dd>
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