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    <p>You need to tokenize the String. (if it always starts with <code>f(</code> and ends with <code>)</code> you can make your life easier, be removing these parts).</p> <p>A(4) -> Find the Classname -> A -> find the Parameter -> 4</p> <p>This is done like this (pseudo java code):</p> <pre><code>public static Object createClass(String className, Double value){ Class a = Class.forName(className); Class[] params = new Class[]{Integer.class}; Constructor c = a.getConstructor(params); Object[] values = new Object[]{value}; return c.newInstance(); } </code></pre> <p>Maybe, this lik is helpful: <a href="http://docs.oracle.com/javase/tutorial/reflect/member/ctorInstance.html" rel="nofollow">http://docs.oracle.com/javase/tutorial/reflect/member/ctorInstance.html</a></p> <p><strong>update</strong> This is like writing a compiler. You can get further information, if you read something about, how to write a compiler: <a href="http://en.wikipedia.org/wiki/Compiler" rel="nofollow">http://en.wikipedia.org/wiki/Compiler</a></p> <p><strong>update 2</strong> put all generated instances into an array. Now you can get the correct method f with the reflections-API. The Code will be something like </p> <p><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Class.html#getDeclaredMethod(java.lang.String" rel="nofollow">http://docs.oracle.com/javase/6/docs/api/java/lang/Class.html#getDeclaredMethod(java.lang.String</a>, java.lang.Class...)</p> <pre><code>Object[] values ... Class[] classes ... for(Object o: values){ add o.getClass() to classes } Method f = Functions.getClass().getDeclaredMethods("f", classes); f.invoke(values); </code></pre>
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    1. POMethod to construct instances from strings and return them with their type?
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    1. USChristian Kuetbach
    1. USChristian Kuetbach
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    1. POMethod to construct instances from strings and return them with their type?
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    1. COThis is most likely the approach the OP needs.
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      1. USrecursion.ninja
    2. COThank you for your answer, however I don't see how this will do what I need. In the last line, you explicitly cast to `A`, so you'll have a switch statement to also handle the case of parsing `B`. Now if I wrap your code in a method, what type do I return? It could be `A` or `B`...
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    3. COReturn Object, the JVM will call the correct method for you. The Code was only one part of the solution. Calling newInstance(), will create an instance of A (the cast is not needed, for the JVM)
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      1. USChristian Kuetbach
 

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