Dynamically call inherited method

[joeyvitoro]

Hi, I have an abstract super class and several sub classes that inherit from it. I need to dynamically pick which class AND which method I use at runtime. Unfortunately I am getting a java.lang.NoSuchMethodException: TestChildClass.getI(). As TestChildClass is a child of TestClass and TestClass.getI() does exist, I assume I may need something else. Thanks!

import java.lang.reflect.Method;
public class TestClass 
{
	protected static int i;
	
	public static int getDynamicMethod(String className, String methodName)
	{
		try
		{
			Class messageClass = Class.forName(className);
			Method classMethod = messageClass.getDeclaredMethod(methodName, null);
			return (Integer) classMethod.invoke(null);
		}
		catch(Exception ex)
		{
			ex.printStackTrace();
		}
		return -1;
	}
	public static int getI()
	{
		return i;
	}
	public static void main(String[] args) 
	{	
		int testI = TestClass.getDynamicMethod("TestChildClass", "getI");
		System.out.println(testI);
	}
}

class TestChildClass extends TestClass
{
	public TestChildClass() 
	{
		i=0;
	}
}

[JosAH]

If the methods aren't static, the first parameter of the invoke( ... ) call can never be null. If the method doesn't take arguments, leave out the second null parameter.

kind regards,

Jos

[joeyvitoro]

Jos,

Thanks for the reply. I have made these changes and I still get the same error.

[joeyvitoro]

SOLUTION

getDeclaredMethod("methodName") will not work for an inherited method. However, getMethod("methodName") will.