Passing methods as methods arguments

Question

Hi,
how can I pass a method to another method?
I need something like this:
public void methodA() {
System.out.println("Hallo world");
public void methodB( Method method ) {
method();
// or
method.invoke();
and in my app:
methodB( methodA );
...of course the code below didn't work :-D
Thanks.

Answer 1

sorry, I didn't understood very well the 'inteface
aproach'. Do you have some example code?If the name of the method to be called truly needs to be dynamic, then this won't work but if you just want different behaviors, then you could do something like this: public interface Doer {
    void doIt();
public class Doer1 implements Doer {
    void doIt() {
        // do some stuff
public class Doer2 implements Doer {
    void doIt() {
        // do some other stuff
public class DoerDriver {
    public static void main(String[] args) {
        for (int ix = 0; ix < args.length; ix++) {
            try {
                Class klass = Class.forName(args[ix]);
                Doer doer = (Doer)klass.newInstance();
                doStuff(doer);
            catch (Exception exc) {
                System.out.println("Couldn't do " + args[ix]);
                exc.printStackTrace();
     * This method only exists to follow your model of passing the "method"--i.e., they dynamic
     * bit--to another method. We could just call doer.doIt() right inside the loop in main.
    private static void doStuff(Doer doer) {
        doer.doIt();
java DoerDriver Doer1 Doer2 Doer2 Doer1
Whether this works for you depends on what you're really trying to do.