blocks|key|3998288|text|public+class+SomeClass+{+
++++static+{
++++++++System.out.println("Being+called+with+the+class+is+loaded");
++++++++initialize();
++++}
++++static+void+initialize(){}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3998289|这就是你的问题？|unstyled|3998290|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>public class SomeClass { 
 static {
 System.out.println("Being called with the class is loaded");
 initialize();
 }
 static void initialize(){}
}
</code></pre>

Is that your question?

blocks|key|4843724|text|看一下Class类，特别是forName方法，它允许您按名称引用类。路径中的任何类都可以像这样加载。我不知道是否有可能重新加载。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4843725|在任何情况下，您想要动态加载的每个类都必须实现您的自定义AddOn接口，从而实现initialize和shutdown。|style|CODE|4843726|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/javase/6/docs/api/java/lang/Class.html|1|http://java.sun.com/javase/6/docs/api/java/lang/Class.html#forName(java.lang.String)^0|3|5|0|D|7|1|0|S|5|14|A|1F|8|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]|$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@$A|Z|B|10|F|G]|$A|11|B|12|F|G]|$A|13|B|14|F|G]]|9|@]|C|$]]|$1|H|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]]]

Have a look at the <a href="http://java.sun.com/javase/6/docs/api/java/lang/Class.html" rel="nofollow noreferrer">Class</a> class, specifically the <a href="http://java.sun.com/javase/6/docs/api/java/lang/Class.html#forName(java.lang.String)" rel="nofollow noreferrer">forName</a> method, which allows you to reference a class by name. Any class in the path can be loaded like this. Whether reloading is possible I don't know.

In any case, each class that you want to dynamically load would have to implement your custom <code>AddOn</code> interface, thus implementing <code>initialize</code> and <code>shutdown</code>.

blocks|key|1250737|text|首先，您需要一个ClassLoader；您可以使用getClass().getClassLoader()获取当前的插件，但是您的插件类必须在类路径中。您可能希望创建一个自定义的类加载器来搜索您的addon目录。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1250738|一旦获得了ClassLoader，就可以将其用于load+a+class。这将为您提供一个Class对象；然后，您可以使用反射来调用initialize()方法(如果存在)。|1250739|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/javase/6/docs/api/java/lang/ClassLoader.html|1|http://java.sun.com/javase/6/docs/api/java/lang/ClassLoader.html#loadClass(java.lang.String))|2|http://java.sun.com/javase/6/docs/api/java/lang/Class.html^0|8|B|P|R|8|B|0|0|5|B|19|5|1U|C|O|C|1|19|5|2|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@$9|Y|A|Z|1|10]]|E|$]]|$1|F|3|G|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@$9|18|A|19|1|1A]|$9|1B|A|1C|1|1D]]|E|$]]|$1|H|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]|R|$5|K|L|M|E|$N|S]]]]

First, you will need a <a href="http://java.sun.com/javase/6/docs/api/java/lang/ClassLoader.html" rel="nofollow noreferrer"><code>ClassLoader</code></a>; you can get the current one with <code>getClass().getClassLoader()</code>, but then your addon classes must be in the classpath. You'll probably want to create a custom classloader that searches your addon directory.

Once you've got the <code>ClassLoader</code>, you can use it to <a href="http://java.sun.com/javase/6/docs/api/java/lang/ClassLoader.html#loadClass(java.lang.String)" rel="nofollow noreferrer">load a class</a>. This gives you a <a href="http://java.sun.com/javase/6/docs/api/java/lang/Class.html" rel="nofollow noreferrer"><code>Class</code></a> object; you can then use reflection to call the <code>initialize()</code> method if it is present.

blocks|key|4843787|text|另一种实现插件的好方法是java.util.Serviceloader。看一看javadoc，它们解释了原理。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4843788|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/javase/6/docs/api/java/util/ServiceLoader.html^0|C|N|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Another nice way to realize addons is <a href="http://java.sun.com/javase/6/docs/api/java/util/ServiceLoader.html" rel="nofollow noreferrer">java.util.Serviceloader</a>. Have a look at the javadocs, they explain the principle.

blocks|key|1256120|text|如果你看一些更复杂的东西，你可以试试：http://jpf.sourceforge.net。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1256121|..。JPF提供了一个动态发现和加载“插件”的运行时引擎。.A插件是一个结构化组件，它使用“清单”向JPF描述自己。..。|1256122|entityMap|0|LINK|mutability|MUTABLE|url|http://jpf.sourceforge.net/^0|J|Q|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

If you look at something more sophisticated, you can try : <a href="http://jpf.sourceforge.net" rel="nofollow noreferrer">http://jpf.sourceforge.net</a>.

... JPF provides a runtime engine that dynamically discovers and loads "plug-ins".A plug-in is a structured component that describes itself to JPF using a "manifest". ...

I have a Java project that needs a "addon" interface. I was thinking about loading some kind of class files having default methods like <code>initialize()</code> and <code>shutdown()</code> that will be called after the class has been loaded into the application. Is this the way to do it? How would I approach this problem?

Including Java classes and running them during runtime

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个Java项目，它需要一个"addon“接口。我在考虑加载某种具有默认方法的类文件，如initialize()和shutdown()，这些方法在类加载到应用程序后将被调用。这是做这件事的方法吗？我该如何处理这个问题？

问包括Java类并在运行时运行它们
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