How to invoke a method in java using reflection

Question

How can I invoke a method with parameters using reflection ?

I want to specify the values of those parameters.

Answer 1

Here's a simple example of invoking a method using reflection involving primitives.

import java.lang.reflect.*;

public class ReflectionExample {
    public int test(int i) {
        return i + 1;
    }
    public static void main(String args[]) throws Exception {
        Method testMethod = ReflectionExample.class.getMethod("test", int.class);
        int result = (Integer) testMethod.invoke(new ReflectionExample(), 100);
        System.out.println(result); // 101
    }
}

To be robust, you should catch and handle all checked reflection-related exceptions NoSuchMethodException, IllegalAccessException, InvocationTargetException.