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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. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	static class TreeNode {
  11. 		TreeNode left;
  12. 		TreeNode right;
  13. 		int data;
  14. 	}
  15. 	public static TreeNode add(TreeNode node, final int value) {
  16. 		TreeNode insert = new TreeNode();
  17. 		insert.data = value;
  18. 		if (node == null) {
  19. 		    return insert;
  20.         }
  21.         TreeNode current = node;
  22. 		while (true) {
  23. 			if (value < current.data) {
  24. 				if (current.left == null) {
  25. 					current.left = insert;
  26. 					break;
  27. 				} else {
  28. 					current = current.left;
  29. 				}
  30. 			} else {
  31. 				if (current.right == null) {
  32. 					current.right = insert;
  33. 					break;
  34. 				} else {
  35. 					current = current.right;
  36. 				}
  37. 			}
  38. 		}
  39. 		return node;
  40. 	}
  41. 	private static void printTree(TreeNode node, String indent) {
  42. 		if (node == null) return;
  43. 		System.out.println(indent+node.data);
  44. 		printTree(node.left, indent+"  ");
  45. 		printTree(node.right, indent+"  ");
  46. 	}
  47. 	public static void main (String[] args) throws java.lang.Exception {
  48. 		TreeNode tree = null;
  49. 	    tree = add(tree, 5);
  50. 	    tree = add(tree, 3);
  51. 	    tree = add(tree, 1);
  52. 	    tree = add(tree, 4);
  53. 	    tree = add(tree, 8);
  54. 	    tree = add(tree, 6);
  55. 	    tree = add(tree, 9);
  56. 		printTree(tree, "");
  57. 	}
  58. }
Success #stdin #stdout 0.07s 380224KB
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Standard input is empty
stdout
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5
  3
    1
    4
  8
    6
    9
https://ideone.com/ptqKAK
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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