OO Programming with Java

Advanced Concepts

Function already exists in java.util.function package:

import java.util.function.*;
public class Funs {
  public static void main(String[] args) {
    Function<Integer,Integer> abs = new Function<Integer,Integer>() 
      { public Integer apply(Integer x) { return (x>=0)?x:-x; }};
    System.out.println(abs.apply(-3));
  }
}

Take a look at the function package and try to identify:

How are defined functions with 2 parameters ?
How are defined functions that return no result ?
How are defined boolean functions modeling "properties" ?
How the concepts are used to manipulate lists (and streams) ?
...

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