Count Frequency Of Strings In Java Binary Tree ... - Dream In Code

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3 Replies - 23 Views - Last Post: 18 minutes ago Rate Topic:

#1 ccb77 ?

Reputation: 0

• Posts: 13
• Joined: 24-March 13

Posted Today, 12:14 PM

How do I implement a frequency counter in a treenode that increases when the user enters an existing word?

I have a program where the user is asked to choose: enter string, search for string

My frequency counter is not working properly. How do I keep track of the frequencies for the left and right nodes? My frequency counter only gives for root:

 public void insert(String item){  		if(isEmpty()){		 			root = new TreeNode(item);                          System.out.println("inserted " + "'" + item + "'" + " into tree. Frequency: " + root.getFreq());                 }                // If string item already exists, do not insert another node, increase the frequency of the node containing the string                         else if(searchTree(root,item) == true){                             root.upFreq();                                                          System.out.println( "'" + item + "'" + " already exists! Frequency: " + root.getFreq());                  //if the string does not already exists, enters string item into new node                                } else{                                                root.add(item);                      System.out.println("inserted " + "'" + item + "'" + " into tree! Frequency: " + root.getFreq());                              }                            }   

  static boolean searchTree(TreeNode root, String item){             if(root == null){                 return false;             }             if(root.item.equals(item)){                 //root.upFreq();                                  return true;                         }             return searchTree(root.left, item) || searchTree(root.right, item);             } 

Is This A Good Question/Topic? 0

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Replies To: count frequency of strings in java binary tree

#2 baavgai ?

Reputation: 4823

• Posts: 11,185
• Joined: 16-October 07

Re: count frequency of strings in java binary tree

Posted 47 minutes ago

Dude! How in the hell can your searchTree be static?!? Tell me TreeNode isn't public...

Your searchTree is, um, disturbing. You should be going left or right, not returning left || right. You call it and seem to expect that root has meaning. It doesn't.

Implement a find item. Go from there:

 private TreeNode findNode(TreeNode parent, String item) { /* your code here */ }  private TreeNode insert(TreeNode parent, String item) { /* your code here */ }  private boolean searchTree(String item) { return findNode(this.root, item)!=null; }  public void insert(String item){ 	if(isEmpty()){ 		this.root = new TreeNode(item);  		System.out.println("inserted " + "'" + item + "'" + " into tree. Frequency: " + root.getFreq()); 	} else { 		TreeNode node = findNode(this.root, item); 		if(node!=null) { 			node.upFreq(); 			System.out.print( "'" + item + "'" + " already exists!"); 		} else { 			node = insert(this.root, item); 			System.out.print("inserted " + "'" + item + "'" + " into tree!"); 		}   		System.out.println(" Frequency: " + node.getFreq()); 	} } 

Hope this helps.

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#3 ccb77 ?

Reputation: 0

• Posts: 13
• Joined: 24-March 13

Re: count frequency of strings in java binary tree

Posted 29 minutes ago

Thanks, no the treenode was not public, and the static was a typo.....

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#4 ccb77 ?

Reputation: 0

• Posts: 13
• Joined: 24-March 13

Re: count frequency of strings in java binary tree

Posted 18 minutes ago

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