give a function as parameter [duplicate]

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How to pass a function as a parameter in Java?

How can i give a function as parameter?

for example:

for(Confetti c : confetti) { b.draw(someFunction(){strokeWeight(random(10)); }

where in the confetti class there would be something like

draw(void myFunc){ for(int i = 0; i < 10; i++) { myFunc(); // run it ellipse(50, 50, 5, 5); } }

there are a lot of errors in the code you've given us to start. — talnicolas
– talnicolas, Commented Feb 28, 2012 at 19:35
Maybe you'll have a look at Reflections: tutorials.jenkov.com/java-reflection/methods.html — BastiS
– BastiS, Commented Feb 28, 2012 at 19:36

Rick Mangi · Accepted Answer · 2012-02-28 19:38:03Z

You can't. Java does not treat functions as first class objects. What you can do is define an interface with a method that contains the function you want called.

interface Confetti { public void draw(); } class DrawRandomStroke implements Confetti { public void draw() { strokeWeight(random(10)); }

And then pass your DrawRandomStroke objects to your method. If you want to use a language that supports what you're trying to do and still be in the java world, look at groovy or scala.

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