Question

Is there a way to pass a call back function in a Java method?

The behavior I’m trying to mimic is a .Net Delegate being passed to a function.

I’ve seen people suggesting creating a separate object but that seems overkill, however I am aware that sometimes overkill is the only way to do things.

Answer 1

If you mean somthing like .NET anonymous delegate, I think Java’s anonymous class can be used as well.

public class Main {      public interface Visitor{         int doJob(int a, int b);     }       public static void main(String[] args) {         Visitor adder = new Visitor(){             public int doJob(int a, int b) {                 return a + b;             }         };          Visitor multiplier = new Visitor(){             public int doJob(int a, int b) {                 return a*b;             }         };          System.out.println(adder.doJob(10, 20));         System.out.println(multiplier.doJob(10, 20));      } }