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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.stream.*;
  4. import java.util.*;
  5. import java.lang.*;
  6. import java.io.*;
  7.  
  8. interface Figure {
  9.  
  10. 	double square();
  11. }
  12.  
  13. final class Rectangle implements Figure {
  14.  
  15. 	private final double width;
  16. 	private final double height;
  17.  
  18. 	public Rectangle(final double width, final double height) {
  19. 		this.width = width;
  20. 		this.height = height;
  21. 	}
  22.  
  23. 	@Override
  24. 	public double square() {
  25. 		return width * height;
  26. 	}
  27.  
  28. 	@Override
  29. 	public String toString() {
  30. 		return String.format("%s{ width = %f ; height = %f }",
  31. 				getClass().getSimpleName(), width, height);
  32. 	}
  33. }
  34.  
  35. final class Circle implements Figure {
  36.  
  37. 	private final double radius;
  38.  
  39. 	public Circle(final double radius) {
  40. 		this.radius = radius;
  41. 	}
  42.  
  43. 	@Override
  44. 	public double square() {
  45. 		return Math.PI * radius * radius;
  46. 	}
  47.  
  48. 	@Override
  49. 	public String toString() {
  50. 		return String.format("%s{ radius = %f }",
  51. 				getClass().getSimpleName(), radius);
  52. 	}
  53. }
  54.  
  55. /* Name of the class has to be "Main" only if the class is public. */
  56. class Ideone {
  57.  
  58. 	private static void printSquares(final Figure... figures) {
  59. 		Stream.of(figures).forEach(f ->
  60. 				System.out.printf("%s square = %f%n", f.toString(), f.square()));
  61. 	}
  62.  
  63. 	public static void main (String[] args) throws java.lang.Exception {
  64. 		printSquares(new Rectangle(3, 4), new Circle(2));
  65. 	}
  66. }
Success #stdin #stdout 0.24s 320832KB
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Standard input is empty
stdout
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Rectangle{ width = 3.000000 ; height = 4.000000 } square = 12.000000
Circle{ radius = 2.000000 } square = 12.566371
https://ideone.com/3ehYgL
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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