Way to use a method as parameter

Processing Coding Questions
1

Hi I’ve been Looking for a way to create a method wich uses an other method for calculating stuff. As I surfed I found that there are methods in specific classes wich can do this for Example in the Library java.awt.event.ActionListener, where you can add a actionListener to a JButton.
It works like this:

button.addActionListener(new ActionListener(){
void ActionPerformed(ActionEvent e){
  // your code stuff
}
}

and my question is:
Is there any way of creating a method doing something like that?
I found something about this Topic but Nothing helped me.

1 Like
2

Sorry I copied the wrong link! The second selected the wrong message!

3

You can edit your post, if you posted something wrong.

As for what you are looking for… you are looking for a way to use any method as a Parameter, correct? If so, try using java.lang.reflect.Method class as a parameter. It does pretty much all you are looking for, if i got you right. :wink:

Edit :

I might be mistaken, but i think this line :

private transient volatile AccessControlContext acc =
        AccessController.getContext();

In the AWTEvent class is what takes the method as an object, though that might be wrong… but that‘s as far as i was able to trace the way of that Code back… So it could actually be anything within AWTEvent class… well, i think it‘s this one. :sweat_smile:

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4

Thenk you for the help but could you make a concrete example?

5

Never mind my last answer, actually the best approach seems to be using lambda expressions in your case. But they are pretty complicated.

As for an example :

float a = 37;

void setup() {
   size(600,400);
}

void draw() {
   printTest(new Test());
   printTest(new Test() {
      void myMethod(float v) {
         println(v + 7);
      }
   });
}

interface Test {
   void myMethod(float v);
}

class ActualTest implements Test {
   void myMethod(float v) {
      println(v);
   }
}

void printTest (Test t) {
   t.myMethod(a);
}

Though a better example is here :

https://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html

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