What's the nearest substitute for a function pointer in Java?

Question

I have a method that's about ten lines of code. I want to create more methods that do exactly the same thing, except for a small calculation that's going to change one line of code. This is a perfect application for passing in a function pointer to replace that one line, but Java doesn't have function pointers. What's my best alternative? JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

Anonymous inner class Say you want to have a function passed in with a String param that returns an int. First you have to define an interface with the function as its only member, if you can't reuse an existing one. interface StringFunction { int func(String param); } A method that takes the pointer would just accept StringFunction instance like so: public void takingMethod(StringFunction sf) { int i = sf.func("my string"); // do whatever ... } And would be called like so: ref.takingMethod(new StringFunction() { public int func(String param) { // body } }); EDIT: In Java 8, you could call it with a lambda expression: ref.takingMethod(param -> bodyExpression);