fork download 
  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. interface Function<I, R> {
  6. 	R invoke(I input);
  7. }
  8.  
  9. class Sqrt implements Function<Double, Double> {
  10. 	public static Sqrt instance = new Sqrt();
  11.  
  12. 	private Sqrt() { }
  13.  
  14. 	public Double invoke(Double input) {
  15. 		return Math.sqrt(input);
  16. 	}
  17. }
  18.  
  19. class Ideone {
  20. 	public static List<Double> map(Function<Double, Double> function, List<Double> values) {
  21. 		List<Double> result = new ArrayList<Double>();
  22. 		for (Double value : values)
  23. 			result.add(function.invoke(value));
  24. 		return result;
  25. 	}
  26.  
  27. 	public static void main(String[] args) {
  28. 		List<Double> numbers = new ArrayList<Double>();
  29. 		numbers.add(3.0);
  30. 		numbers.add(4.0);
  31. 		numbers.add(5.0);
  32. 		List<Double> roots = map(Sqrt.instance, numbers);
  33. 		for (Double root : roots)
  34. 			System.out.println(root);
  35. 	}
  36. }
Success #stdin #stdout 0.08s 380160KB
comments (?)
stdin 
Standard input is empty
stdout 
1.7320508075688772
2.0
2.23606797749979
https://ideone.com/YUmxuq
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!