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<a href="http://wiki.javaforum.hu/display/~auth.gabor" style="color:#326ca6;text-decoration:none;; color: #326ca6; text-decoration: none">Auth Gábor</a> wrote a blog post:
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<td valign="top" style="font-size: 13px"> <h2 id="email-title-heading" style="font-size: 16px; line-height: 20px; min-height: 20px; margin: 0; padding: 0"> <a href="http://wiki.javaforum.hu/display/JAVAFORUM/2012/06/08/Java7+-+java.util.Objects" style="color: #326ca6; text-decoration: none"> <img class="icon" src="cid:blogpost-icon" alt="" style="border: 0; padding: 0 2px 0 0; text-align: left" /> <strong style="font-size:16px;line-height:20px;vertical-align:top;">Java7 - java.util.Objects</strong> </a> </h2> </td>
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<p style="font-size: 13px">A Java7 egyik csendes újítása a <a href="http://hg.openjdk.java.net/jdk7/build/jdk/file/9b8c96f96a0f/src/share/classes/java/util/Objects.java" class="external-link" rel="nofollow" style="color: #326ca6; text-decoration: none">java.util.Objects</a> osztály, amely közel tucatnyi statikus metódust ad az objektumok kezeléséhez, amely metódusok egy része nem esik zavarba, ha <em>null</em> értéket kap. Az Objects tipikus esete utility osztályoknak, <em>final</em> módosítóval van ellátva, illetve van egy privát konstruktora is:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Objects.java</b>
</div>
<div class="codeContent panelContent">
<pre class="first-line: 37; theme: Default; brush: java; gutter: true" style="font-size: 13px">private Objects() {
throw new AssertionError("No java.util.Objects instances for you!");
}</pre>
</div>
</div>
<p style="font-size: 13px">Suhanjunk végig az eddig megvalósított metóduslistán... <img class="emoticon emoticon-smile" src="/s/en_GB/3273/3/_/images/icons/emoticons/smile.png" data-emoticon-name="smile" alt="(smile)" /></p>
<h3 id="Java7-javautilObjects-equals">equals</h3>
<p style="font-size: 13px">Az első metódus egy egyszerű egyezőség vizsgálat, amely levizsgálja a két összehasonlítandó paraméter közül az elsőt, hogy annak értéke nem <em>null</em>, majd ezek után végzi el az összevetést, így ez a metódus <em>null safe</em>: használata során nem kellNullPointerException kivételre számítanunk. A forrása egyszerű:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Objects.java</b>
</div>
<div class="codeContent panelContent">
<pre class="first-line: 56; theme: Default; brush: java; gutter: true" style="font-size: 13px">public static boolean equals(Object a, Object b) {
return (a == b) || (a != null && a.equals(b));
}</pre>
</div>
</div>
<p style="font-size: 13px">Használata:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Example.java</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: false" style="font-size: 13px">String a = null;
String b = null;
System.out.println(Objects.equals(a, b));
b = "nem üres";
System.out.println(Objects.equals(a, b));
a = "nem üres";
System.out.println(Objects.equals(a, b));</pre>
</div>
</div>
<p style="font-size: 13px">Az eredmény:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Az eredmény</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: html/xml; gutter: false" style="font-size: 13px">true
false
true</pre>
</div>
</div>
<h3 id="Java7-javautilObjects-deepEquals">deepEquals</h3>
<p style="font-size: 13px">A <em>deepEquals</em> metódus hasonlít a fentire, de sima <em>equals</em> helyett az <em>Arrays.deepEquals</em> metódust hívja meg <em>null</em> ellenőrzéssel, így egy sorban tudunk két tömböt összevetni:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Objects.java</b>
</div>
<div class="codeContent panelContent">
<pre class="first-line: 77; theme: Default; brush: java; gutter: true" style="font-size: 13px">public static boolean deepEquals(Object a, Object b) {
if (a == b)
return true;
else if (a == null || b == null)
return false;
else
return Arrays.deepEquals0(a, b);
}</pre>
</div>
</div>
<p style="font-size: 13px">Használata:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Example.java</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: false" style="font-size: 13px">String[] a = null;
String[] b = null;
System.out.println(Objects.deepEquals(a, b));
b = new String[]{"semmi", "újabb semmi"};
System.out.println(Objects.deepEquals(a, b));
a = new String[]{"semmi", "újabb semmi"};
System.out.println(Objects.deepEquals(a, b));</pre>
</div>
</div>
<p style="font-size: 13px">Az eredmény:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Az eredmény</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: html/xml; gutter: false" style="font-size: 13px">true
false
true</pre>
</div>
</div>
<h3 id="Java7-javautilObjects-hashCode">hashCode</h3>
<p style="font-size: 13px">A <em>hashCode</em> lehetőséget ad <em>null safe</em> hívásra, az átadott objektumnak csak akkor hívódik meg a <em>hashCode</em> metódusa, ha a paraméter nem <em>null</em>:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Objects.java</b>
</div>
<div class="codeContent panelContent">
<pre class="first-line: 95; theme: Default; brush: java; gutter: true" style="font-size: 13px">public static int hashCode(Object o) {
return o != null ? o.hashCode() : 0;
}</pre>
</div>
</div>
<p style="font-size: 13px">Használata:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Example.java</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: false" style="font-size: 13px">String a = null;
System.out.println(Objects.hashCode(a));
a = "semmi";
System.out.println(Objects.hashCode(a));</pre>
</div>
</div>
<p style="font-size: 13px">Az eredmény:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Az eredmény</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: html/xml; gutter: false" style="font-size: 13px">0
109322039</pre>
</div>
</div>
<h3 id="Java7-javautilObjects-hash">hash</h3>
<p style="font-size: 13px">Hasonlít az előzőre, azzal a különbséggel, hogy a metódus paraméterlistája dinamikusan bővíthető, s az eredményül kapott objektum-tömb átadásra kerül a <em>Arrays.hashCode</em> metódusnak, így lehetőségünk van <em>null</em> biztos hash képzésre több argumentumból:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Objects.java</b>
</div>
<div class="codeContent panelContent">
<pre class="first-line: 125; theme: Default; brush: java; gutter: true" style="font-size: 13px">public static int hash(Object... values) {
return Arrays.hashCode(values);
}</pre>
</div>
</div>
<p style="font-size: 13px">Használata:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Example.java</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: false" style="font-size: 13px">String a = null;
String b = null;
System.out.println(Objects.hash(a, b));
b = "semmi";
System.out.println(Objects.hash(a, b));
a = "semmi";
System.out.println(Objects.hash(a, b));</pre>
</div>
</div>
<p style="font-size: 13px">Az eredmény:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Az eredmény</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: html/xml; gutter: false" style="font-size: 13px">961
109323000
-796661087</pre>
</div>
</div>
<h3 id="Java7-javautilObjects-toString">toString</h3>
<p style="font-size: 13px">Ez a metódus kissé kilóg a többi közül, mert <em>null</em> biztos konverzióra eddig is lehetőség volt az alább is látható <em>String.valueOf(o)</em> használatával:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Objects.java</b>
</div>
<div class="codeContent panelContent">
<pre class="first-line: 139; theme: Default; brush: java; gutter: true" style="font-size: 13px">public static String toString(Object o) {
return String.valueOf(o);
}</pre>
</div>
</div>
<p style="font-size: 13px">Használata:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Example.java</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: false" style="font-size: 13px">String a = null;
System.out.println(Objects.toString(a));
a = "semmi";
System.out.println(Objects.toString(a));</pre>
</div>
</div>
<p style="font-size: 13px">Az eredmény:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Az eredmény</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: html/xml; gutter: false" style="font-size: 13px">null
semmi</pre>
</div>
</div>
<h3 id="Java7-javautilObjects-toStringalapértelmezettérték">toString + alapértelmezett érték</h3>
<p style="font-size: 13px">Az előzőnél sokkal hasznosabb metódus a most következő, amelynél megadhatunk egy alapértelmezett értéket, ha az átadott objektum értéke <em>null</em>:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Objects.java</b>
</div>
<div class="codeContent panelContent">
<pre class="first-line: 156; theme: Default; brush: java; gutter: true" style="font-size: 13px">public static String toString(Object o, String nullDefault) {
return (o != null) ? o.toString() : nullDefault;
}</pre>
</div>
</div>
<p style="font-size: 13px">Használata:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Example.java</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: false" style="font-size: 13px">String a = null;
System.out.println(Objects.toString(a, "hopsza, ez null"));
a = "semmi";
System.out.println(Objects.toString(a));</pre>
</div>
</div>
<p style="font-size: 13px">Az eredmény:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Az eredmény</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: html/xml; gutter: false" style="font-size: 13px">hopsza, ez null
semmi</pre>
</div>
</div>
<h3 id="Java7-javautilObjects-compare">compare</h3>
<p style="font-size: 13px">A <em>compare</em> metódus két objektum összehasonlítására jó, s ez a többi metódushoz képest két okból is rendhagyó:</p>
<ul>
<li style="font-size: 13px">nem <em>null safe</em></li>
<li style="font-size: 13px">kell neki egy Comparator implementáció, amely szükség esetén lehet <em>null safe</em></li>
</ul>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Objects.java</b>
</div>
<div class="codeContent panelContent">
<pre class="first-line: 180; theme: Default; brush: java; gutter: true" style="font-size: 13px">public static <T> int compare(T a, T b, Comparator<? super T> c) {
return (a == b) ? 0 : c.compare(a, b);
}</pre>
</div>
</div>
<p style="font-size: 13px">Használata (hibát okoz):</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Example.java</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: false" style="font-size: 13px">Comparator<String> comparator = new Comparator<String>() {
public int compare(String o1, String o2)
{
return o1.compareTo(o2);
}
};
String a = null;
String b = null;
System.out.println(Objects.compare(a, b, comparator));
b = "semmi";
System.out.println(Objects.compare(a, b, comparator));
a = "semmi";
System.out.println(Objects.compare(a, b, comparator));</pre>
</div>
</div>
<p style="font-size: 13px">Az eredmény:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Az eredmény</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: html/xml; gutter: false" style="font-size: 13px">0
Exception in thread "main" java.lang.NullPointerException
at hu.javaforum.showobjects.App$1.compare(App.java:19)
at hu.javaforum.showobjects.App$1.compare(App.java:15)
at java.util.Objects.compare(Objects.java:181)
at hu.javaforum.showobjects.App.main(App.java:27)</pre>
</div>
</div>
<h3 id="Java7-javautilObjects-requireNonNull">requireNonNull</h3>
<p style="font-size: 13px">Ez egy nagyon hasznos metódus, jegyezzük meg, mert nem csinál ugyan sokat, de azt gyakran használjuk, ha paramétereket ellenőrzünk! Megvizsgálja, hogy az átadott első paraméter <em>null</em> értékű-e, ha igen, akkor dob egy <em>NullPointerException</em> kivételt, ha nem, akkor visszaadja az objektumot:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Objects.java</b>
</div>
<div class="codeContent panelContent">
<pre class="first-line: 199; theme: Default; brush: java; gutter: true" style="font-size: 13px">public static <T> T requireNonNull(T obj) {
if (obj == null)
throw new NullPointerException();
return obj;
}</pre>
</div>
</div>
<p style="font-size: 13px">Használata:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Example.java</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: false" style="font-size: 13px">String a = Objects.requireNonNull("semmi");
System.out.println(a);
String b = Objects.requireNonNull(null);
System.out.println(b);</pre>
</div>
</div>
<p style="font-size: 13px">Az eredmény:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Az eredmény</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: html/xml; gutter: false" style="font-size: 13px">semmi
Exception in thread "main" java.lang.NullPointerException
at java.util.Objects.requireNonNull(Objects.java:201)
at hu.javaforum.showobjects.App.main(App.java:17)</pre>
</div>
</div>
<h3 id="Java7-javautilObjects-requireNonNullszöveg">requireNonNull + szöveg</h3>
<p style="font-size: 13px">Hasonló a fentihez, ám ez esetben megadhatunk egy szöveget, amely adott esetben átadódik a <em>NullPointerException</em> kivételnek:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Objects.java</b>
</div>
<div class="codeContent panelContent">
<pre class="first-line: 224; theme: Default; brush: java; gutter: true" style="font-size: 13px">public static <T> T requireNonNull(T obj, String message) {
if (obj == null)
throw new NullPointerException(message);
return obj;
}</pre>
</div>
</div>
<p style="font-size: 13px">Használata:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Example.java</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: false" style="font-size: 13px">String a = Objects.requireNonNull("semmi", "A paraméter értéke null");
System.out.println(a);
String b = Objects.requireNonNull(null, "A paraméter értéke null");
System.out.println(b);</pre>
</div>
</div>
<p style="font-size: 13px">Az eredmény:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>Az eredmény</b>
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<div class="codeContent panelContent">
<pre class="theme: Default; brush: html/xml; gutter: false" style="font-size: 13px">semmi
Exception in thread "main" java.lang.NullPointerException: A paraméter értéke null
at java.util.Objects.requireNonNull(Objects.java:226)
at hu.javaforum.showobjects.App.main(App.java:17)</pre>
</div>
</div>
<h3 id="Java7-javautilObjects-Konklúzió">Konklúzió</h3>
<p style="font-size: 13px">Nagyon hasznos osztály, használja mindenki – aki teheti, ugyanis nagyon sok saját osztály van a projektjeinkben, amelyek hasonló vagy pontosan ilyen módon működnek, mivel egy-egy fenti metódus használatával a forráskódunk egyszerűbb és átláthatóbb lesz, másrészt kevesebb saját forráskódot kell majd karbantartanunk.</p>
<p style="font-size: 13px">(inspiráció: <a href="http://www.javabeat.net/2012/06/java-util-objects-a-static-utility-for-objects-introduced-in-java-7/" class="external-link" rel="nofollow" style="color: #326ca6; text-decoration: none">www.javabeat.net/2012/06/java-util-objects-a-static-utility-for-objects-introduced-in-java-7/</a>)</p>
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<span class="bv_viewracker_span bv_viewtracker_closed"> Page viewed 1 times by 1 users since Jun 08, 2012 </span>
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<td class="bv_viewtracker_body_lastviewed" style="font-size: 13px; border-bottom: 1px solid #bbb; text-align: left; padding: 4px 16px 4px 0">Jun 08, 2012 19:01</td>
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