Java - Passing and executing a function [duplicate]

Question

Is there a way of passing a function to another function and then executing it?

functionCaller(functionToBeCalled());

Answer 1

In java 8 you can use a method reference or lambda

functionCaller(this::functionToBeCalled);

or

functionCaller(() -> functionToBeCalled());

Answer 2

I don't know if I understand very well your question, but effectively you can call a function in param of another function.

You can do this (I suppose your current language is Java):

// if write(...) and getValue() are static method of Writer class  
Writer.write(getValue());

// if write(...) and getValue() can just be used by instanciate an object
Writer writer = new Writer();
String val = writer.getValue();
writer.write(val);

There are basic Java programming lesson. Thanks