blocks|key|1297901|text|创建一些假装实现动态接口的东西实际上并不太难。在实现InvocationHandler之后，您可以使用java.lang.reflect.Proxy来处理任何方法调用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1297902|当然，您实际上可以使用像BCEL这样的库生成一个真正的类。|1297903|如果这是为了测试目的，您应该看看模拟框架，如jMock和EasyMock。|1297904|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/javase/6/docs/api/java/lang/reflect/InvocationHandler.html|1|http://java.sun.com/javase/6/docs/api/java/lang/reflect/Proxy.html|2|http://jakarta.apache.org/bcel/|3|http://www.jmock.org/|4|http://easymock.org/^0|Q|H|1F|N|Q|H|0|1F|N|1|0|C|4|2|0|M|5|3|S|8|4|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@$9|14|A|15|1|16]|$9|17|A|18|1|19]]|E|$]]|$1|F|3|G|5|6|7|1A|8|@]|D|@$9|1B|A|1C|1|1D]]|E|$]]|$1|H|3|I|5|6|7|1E|8|@]|D|@$9|1F|A|1G|1|1H]|$9|1I|A|1J|1|1K]]|E|$]]|$1|J|3|-4|5|6|7|1L|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]|R|$5|M|N|O|E|$P|S]]|T|$5|M|N|O|E|$P|U]]|V|$5|M|N|O|E|$P|W]]|X|$5|M|N|O|E|$P|Y]]]]

Creating something which pretends to implement an interface on the fly actually isn't too hard. You can use <a href="http://java.sun.com/javase/6/docs/api/java/lang/reflect/Proxy.html" rel="noreferrer"><code>java.lang.reflect.Proxy</code></a> after implementing <a href="http://java.sun.com/javase/6/docs/api/java/lang/reflect/InvocationHandler.html" rel="noreferrer"><code>InvocationHandler</code></a> to handle any method calls.

Of course, you could actually generate a real class with a library like <a href="http://jakarta.apache.org/bcel/" rel="noreferrer">BCEL</a>.

If this is for test purposes, you should look at mocking frameworks like <a href="http://www.jmock.org/" rel="noreferrer">jMock</a> and <a href="http://easymock.org/" rel="noreferrer">EasyMock</a>.

blocks|key|1297959|text|如果你想超越接口，你可能想看看cglib和objenesis。结合起来，它们将允许您做一些非常强大的事情，扩展抽象类并实例化它。(例如，jMock将它们用于此目的。)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1297960|如果你想坚持使用接口，那就照Jon+Skeet说的做:)。|1297961|entityMap|0|LINK|mutability|MUTABLE|url|http://cglib.sourceforge.net/|1|http://code.google.com/p/objenesis/|2|http://www.jmock.org/mocking-classes.html^0|F|5|0|L|9|1|1W|5|2|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]|$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]]]

If you want to go beyond interfaces, you might want to take a look at <a href="http://cglib.sourceforge.net/" rel="nofollow noreferrer">cglib</a> and <a href="http://code.google.com/p/objenesis/" rel="nofollow noreferrer">objenesis</a>. Together, they will allow you to do some pretty powerful stuff, extending an abstract class and instantiating it. (<a href="http://www.jmock.org/mocking-classes.html" rel="nofollow noreferrer">jMock</a> uses them for that purpose, for example.)

If you want to stick with interfaces, do what Jon Skeet said :).

blocks|key|1512727|text|实际上，您必须在Class.fromName()方法中使用类名，并将其强制转换为接口类型。看看下面的示例是否有帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1512728|public+class+Main+{

++++public+static+void+main(String[]+args)+throws+Exception+{
++++++++Car+ferrari+=+(Car)+Class.forName("Mercedez").newInstance();
++++++++System.out.println(ferrari.getName());
++++}
}

interface+Car+{
++++String+getName();
}

class+Mercedez+implements+Car+{

++++@Override
++++public+String+getName()+{
++++++++return+"Mercedez";
++++}

}

class+Ferrari+implements+Car+{

++++@Override
++++public+String+getName()+{
++++++++return+"Ferrari";
++++}

}|code-block|syntax|javascript|1512729|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Actually, you have to use the class name in Class.fromName() method and cast to your interface type. See if the sample below helps.

<pre><code>public class Main {

 public static void main(String[] args) throws Exception {
 Car ferrari = (Car) Class.forName("Mercedez").newInstance();
 System.out.println(ferrari.getName());
 }
}

interface Car {
 String getName();
}

class Mercedez implements Car {

 @Override
 public String getName() {
 return "Mercedez";
 }

}

class Ferrari implements Car {

 @Override
 public String getName() {
 return "Ferrari";
 }

}
</code></pre>

<pre><code>Class someInterface = Class.fromName("some.package.SomeInterface");
</code></pre>

How do I now create a new class that implements <code>someInterface</code>?

I need to create a new class, and pass it to a function that needs a <code>SomeInterface</code> as an argument.

Java Reflection: Create an implementing class

Class someInterface = Class.fromName("some.package.SomeInterface");现在如何创建实现someInterface的新类我需要创建一个新类，并将其传递给一个需要SomeInterface作为参数的函数。

问Java反射:创建实现类
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Java反射:创建实现类EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Java反射:创建实现类
EN