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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. abstract class Node {
  8. 	abstract double evaluate();
  9. }
  10.  
  11. class ValueNode extends Node {
  12. 	double value;
  13.  
  14. 	public ValueNode(double value) {
  15. 		this.value = value;
  16. 	}
  17.  
  18. 	double evaluate() {
  19. 		return value;
  20. 	}
  21. }
  22.  
  23. abstract class OpNode extends Node {
  24. 	Node left;
  25. 	Node right;
  26.  
  27. 	public OpNode(Node left, Node right) {
  28. 		this.left = left;
  29. 		this.right = right;
  30. 	}
  31. }
  32.  
  33. class MultiplicationNode extends OpNode {
  34. 	public MultiplicationNode(Node left, Node right) {
  35. 		super(left, right);
  36. 	}
  37.  
  38. 	@Override
  39. 	double evaluate() {
  40. 		return left.evaluate() * right.evaluate();
  41. 	}
  42. }
  43.  
  44. class AdditionNode extends OpNode {
  45. 	public AdditionNode(Node left, Node right) {
  46. 		super(left, right);
  47. 	}
  48.  
  49. 	@Override
  50. 	double evaluate() {
  51. 		return left.evaluate() + right.evaluate();
  52. 	}
  53. }
  54.  
  55. class Ideone
  56. {
  57. 	public static void main (String[] args) throws java.lang.Exception
  58. 	{
  59. 		Node node = new AdditionNode(
  60. 		    new ValueNode(1),
  61. 		    new MultiplicationNode(
  62. 		        new ValueNode(2),
  63. 		        new ValueNode(3)
  64. 		    )
  65. 		);
  66.  
  67. 		System.out.println(node.evaluate());
  68. 	}
  69. }
Success #stdin #stdout 0.07s 380160KB
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Standard input is empty
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7.0
https://ideone.com/oCVR8S
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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