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20045501
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2013-11-18T10:29:15.673
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2013-11-20T10:31:36.560
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2013-11-20T10:31:36.560
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text
Body
You could use the full class name as in <code>package.ClassName</code>, reflection, and <code>Class.forName(theName)</code>. For instance with a <code>String</code> object: <pre><code>try { String newString = (String)Class.forName("java.lang.String").newInstance(); } catch (IllegalAccessException iae) { // TODO handle } catch (InstantiationException ie) { // TODO handle } catch (ClassNotFoundException cnfe) { // TODO handle } </code></pre> So your method could roughly look like: <pre><code>@SuppressWarnings("unchecked") public static <T> T getInstance(String clazz) { // TODO check for clazz null try { return (T)Class.forName(clazz).getMethod("getInstance", (Class<?>[])null).invoke(null, (Object[])null); } catch (ClassNotFoundException cnfe) { // TODO handle return null; } catch (NoSuchMethodException nsme) { // TODO handle return null; } catch (InvocationTargetException ite) { // TODO handle return null; } catch (IllegalAccessException iae) { // TODO handle return null; } } </code></pre> Edit for OP: The <code>(Class<?>[])null</code> and <code>(Object[])null</code> are <code>null</code> arguments cast as their expected type. Basically: <ul> <li>the <code>getMethod</code> method of <code>Class</code> takes a <code>String</code> representing the method's name, and a varargs of <code>Class<?></code> representing its parameter types. The method we call (<code>getInstance</code>) takes no arguments, therefore the argument to <code>getMethod</code> is null, but we want to cast it as the expected argument. More info <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Class.html#getMethod%28java.lang.String,%20java.lang.Class...%29" rel="nofollow">here</a>.</li> <li>the <code>invoke</code> method of <code>Method</code> takes an <code>Object</code> as the target instance to invoke the method against (in our case, <code>null</code> since it's a class method) and a varargs of <code>Object</code> as the arguments. But again, your <code>getInstance</code> method takes no arguments, so we use <code>null</code> and cast it as an array of <code>Object</code>. More info <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/reflect/Method.html#invoke%28java.lang.Object,%20java.lang.Object...%29" rel="nofollow">here</a>.</li> </ul>
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