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blaw@mkisserve.com
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 Posted: Sat May 21, 2005 7:59 am Post subject: Loading and running a class |
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Using the documentation provided by SUN, I have written the following
program:
import java.lang.reflect.*;
class RunClass
{
public static void main(String args[])
{
try {
Class c = Class.forName("MyClass");
Object obj = c.newInstance();
Class[] parameterTypes = null;
Method getMethod = c.getMethod("getData",parameterTypes);
Method putMethod = c.getMethod("putData",parameterTypes);
getMethod.invoke(obj,parameterTypes);
putMethod.invoke(obj,parameterTypes);
}
catch(InstantiationException ie) { System.out.println(ie); }
catch(ClassNotFoundException ie) { System.out.println(ie); }
catch(IllegalAccessException ie) { System.out.println(ie); }
catch(NoSuchMethodException ie) { System.out.println(ie); }
catch(InvocationTargetException ie) { System.out.println(ie); }
}
}
In order to get the method invoke function to work, I had to change the
parameters. This may be because I'm using following version of java.
java -version
java version "1.4.2-rc1"
Java(TM) 2 Runtime Environment, Standard Edition (build
Blackdown-1.4.2-rc1)
Java HotSpot(TM) Client VM (build Blackdown-1.4.2-rc1, mixed mode)
My question is how to I call the method invoke routine and pass it
parameters and get a result back?
Any help is appreciated.
Thanks,
Bob Law
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Janwillem Borleffs
Guest
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| Posted: Sat May 21, 2005 9:58 am Post subject: Re: Loading and running a class |
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[email]blaw (AT) mkisserve (DOT) com[/email] wrote:
| Quote: | My question is how to I call the method invoke routine and pass it
parameters and get a result back?
|
class MyClass {
public void printHello(String name) {
System.out.println("Hello " + name);
}
}
class RunClass {
public static void main(String args[]) {
try {
Class c = Class.forName("MyClass");
Object obj = c.newInstance();
Class[] parameters = { new String().getClass() };
Method printHello = c.getMethod("printHello", parameters);
Object[] input = { "Joe" };
printHello.invoke(obj, input);
} catch (Exception e) {
e.printStackTrace();
}
}
}
See also: http://www.angelfire.com/tx4/cus/shapes/covariance.html
HTH;
JW
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