Overriding Interface methods via JNI

893718

Hello,

How we can override Interface methods via JNI?

For example:

At HelloWorldSwing example:

http://download.oracle.com/javase/tutorial/uiswing/examples/start/HelloWorldSwingProject/src/start/HelloWorldSwing.java

I've written anonymous Interface as:

import javax.swing.*;        

public class HelloWorldSwing1 {
    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("HelloWorldSwing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Add the ubiquitous "Hello World" label.
        JLabel label = new JLabel("Hello World");
        frame.getContentPane().add(label);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }
    
    static Runnable runnableObject = new Runnable() {
    	public void run() {
    		createAndShowGUI();    		
    	}
    };
    
   public static void main(String[] args) {
    	//Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        SwingUtilities.invokeLater(runnableObject);
    }
}

via JNI functions(http://download.oracle.com/javase/1.4.2/docs/guide/jni/spec/functions.html) we cannot override Runnable Interface's run method? Can we?

Only:

RunnableClass's value isn't null with given example at below. FindClass finds the Runnable Interface.

jclass RunnableClass;
RunnableClass = (*env)->FindClass(env,"java/lang/Runnable");
  if( RunnableClass == NULL ) {
    printf("can't find class Runnable\n");
    exit (-1);
  }

But How can we override Runnable class's run method?

Thanks in Advance

EJP

The only way you can override a method in Java is by defining a class that does so, either statically or as an anonymous inner class. You can't do either of those things in JNI. Ergo you cannot do what you are asking about.