fork download
copy 
  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. interface Calc {
  8. 	int calc();
  9. 	default void println() {
  10. 		System.out.println(this.getClass().getSimpleName() + ": " + calc());
  11. 	}
  12. }
  13.  
  14. class SomeClass {
  15.  
  16. 	private int x;
  17.  
  18. 	public SomeClass(int x) {
  19. 		this.x = x;
  20. 	}
  21.  
  22. 	public class InnerSum implements Calc {
  23. 		private int y;
  24. 		public InnerSum(int y) {
  25. 			this.y = y;
  26. 		}
  27. 		public int calc() {
  28. 			return x + y;
  29. 		}
  30. 	}
  31.  
  32. 	public static class Nested implements Calc {
  33. 		private int y;
  34. 		public Nested(int y) {
  35. 			this.y = y;
  36. 		}
  37. 		public int calc() {
  38. 			return y; // x is not available here
  39. 		}
  40. 	}
  41. }
  42.  
  43. /* Name of the class has to be "Main" only if the class is public. */
  44. class Ideone {
  45.  
  46. 	public static void main (String[] args) throws java.lang.Exception {
  47. 		SomeClass a = new SomeClass(12);
  48. 		Calc ai = a.new InnerSum(34);
  49. 		Calc an = new SomeClass.Nested(34);
  50. 		ai.println();
  51. 		an.println();
  52. 	}
  53. }
Success #stdin #stdout 0.1s 320512KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
InnerSum: 46
Nested: 34
https://ideone.com/xGdJO3
language:
Java (12.0.1)
created:
8 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!