JAVA EE: How to call the public method using Java Reflection

Thursday 2 November 2017

How to call the public method using Java Reflection | Reflection in java

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DisplayMessage.java

class DisplayMessage
{
    public void displayMessage(String message)
    {
        System.out.println(message);
    }
}

ReflectionDemo.java

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * 
 * Invoking Methods using Method Object.
 *
 */
public class ReflectionDemo
{
    public static void main(String[] args)
    {
        try
        {
            Class<DisplayMessage> classObj = DisplayMessage.class;
            Method method = classObj.getMethod("displayMessage",
                                            new Class[] { String.class });

            DisplayMessage displayMessageObj= classObj.newInstance();
            /*
             * Invokes the underlying method represented by this Method object,
             * on the specified object with the specified parameters.
             */
            method.invoke(displayMessageObj, "hi");

        }
        catch (SecurityException | IllegalArgumentException
                | NoSuchMethodException | IllegalAccessException
                | InvocationTargetException | InstantiationException e)
        {
            e.printStackTrace();
        }
    }

}