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  1.  class Node {
  2. 	public Node left;
  3. 	public int data;
  4. 	public Node right;
  5. //Test
  6. 	public Node(int val) 	{
  7. 		this.data=val;
  8. 	}
  9. }
  10.  
  11.  
  12. /**
  13.  * BFS of Tree 
  14.  * @author Prateek
  15.  */
  16.  class PrintTreeBFS {
  17.  
  18. 	/**
  19. 	 * for printing BFS (recursive) 
  20. 	 * @param root
  21. 	 */
  22. 	public void printTreeBFS(Node root) {
  23. 		if(root==null)
  24. 			System.out.println("Empty Tree");
  25.  
  26. 		int height=height(root);
  27.  
  28. 		for(int i=1 ; i<=height ; i++){
  29. 			printLevel(root, i);
  30. 			System.out.println();
  31. 		}
  32. 	}
  33.  
  34. 	/**
  35. 	 * Prints nodes at a given level
  36. 	 * @param root
  37. 	 * @param level
  38. 	 */
  39. 	public void printLevel(Node root, int level) {
  40. 			if(root==null)
  41. 				return ;
  42.  
  43. 			if(level==1)
  44. 				System.out.print(root.data + "\t");
  45.  
  46. 			printLevel(root.left, level-1) ;
  47. 			printLevel(root.right, level-1) ;
  48. 	}
  49.  
  50. 	/**
  51. 	 * @param root of the tree
  52. 	 * @return height of the tree
  53. 	 */
  54. 	public int height(Node root) {
  55. 		if(root == null)
  56. 			return 0;
  57.  
  58. 		int lHeight=height(root.left);
  59. 		int rHeight=height(root.right);
  60.  
  61. 		return max(lHeight,rHeight) + 1;
  62. 	}
  63.  
  64. 	/**
  65. 	 * @param val1
  66. 	 * @param val2
  67. 	 * @return maximum val
  68. 	 */
  69. 	private int max(int val1, int val2) {
  70. 		return val1 > val2 ? val1 : val2;
  71. 	}
  72.  
  73.  
  74. 	public static void main(String[] args) {
  75. 		Node root=new Node(12);
  76.  
  77. 		Node n1=new Node(14);
  78. 		Node n2=new Node(18);
  79. 		Node n3=new Node(10);
  80. 		root.left=new Node(8);
  81. 		root.right=new Node(16);
  82. 		root.left.left=new Node(6);
  83. 		root.left.right=n3;
  84. 		root.right.left=n1;
  85. 		root.right.right=n2;
  86.  
  87.  
  88. 		PrintTreeBFS obj=new PrintTreeBFS();
  89. 		obj.printTreeBFS(root);
  90.  
  91. 	}
  92. }
  93.  
Success #stdin #stdout 0.08s 380160KB
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12	
8	16	
6	10	14	18
https://ideone.com/JUKk4o
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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