treemap

问题 I'm trying to instantiate a TreeMap using a Comparator which should be able to access the said TreeMap , i.e. the one it will be used for (I guess that " will " must precisly be the problem...): final Map<String, Integer> map = new TreeMap<String, Integer>(new Comparator<String>() { @Override public int compare(String o1, String o2) { Integer i = map.get(o1); // Error: "the local variable map may not have been initialized" return ...; } }); I can get why this error occurs, since when

问题 I am trying to populate repeated forms with PDFbox. I am using a TreeMap and populating the forms with individual records. The format of the pdf form is such that there are six records listed on page one and a static page inserted on page two. (For a TreeMap larger than six records, the process repeats). The error Im getting is specific to the size of the TreeMap. Therein lies my problem. I can't figure out why when I populate the TreeMap with more than 35 entries I get this warning: Apr 23,

问题 I am currently working on a project in which I am retrieving data about names from the Social Security website. Basically I'm given a number x, and years y and z. I have to return the top x names from each of the years y through z. So the data returned from the website is a name, a rank, and a year. I have to enter each name returned into either a TreeMap, HashMap, or LinkedHashMap, but I'm not sure how to store them, because no matter what I use as the key, there might be duplicates. The

问题 In a project I need to remove all objects having key value greater than a certain key (key type is Date , if it matters). As far as I know TreeMap implemented in Java is a red-black tree which is a binary search tree. So I should get O(n) when removing a subtree. But I can't find any method to do this other than making a tail view and remove one by one, which takes O(logn) . Any good ideas implementing this function? I believe treeMap is the correct dataStructure to use and should be able to

问题 I have a TreeMap as follows: TreeMap<Parent, List<Child>> mapOfParentsAndChilds = new TreeMap<Parent, List<Child>>(); I want to order the Map by the following condition: The First key (Parent object) in the Map will be the one that has the oldest child in their list of values. i.e. If the oldest child in Parent A's list of values was 20 years old, and the oldest child in Parent B's list of values was 19 years old then Parent A should be before Parent B in the map and so on. How can I

问题 I have a treemap (simple) to which I want to add a new element (see DS0 and DS1 in the code below). I don't want to re-create the whole treemap, instead I want to "update" the data. Sticky is false update section adjusts the g transform (OK) update section adjusts the contained rect width/height (not OK) with devmode off (chrome) the rects width/heights are not being updated (looks like the d.x and d.y values are the old values - can be seen with the cosnole.log statements) with devmode on

问题 Is there a way to retrieve all the leaf nodes of a Java TreeMap ? I have a TreeMap like this TreeMap<String, FooBar> myTree = new TreeMap<String, FooBar>(new Comparator<String>() { public int compare(String o1, String o2) { int b1 = Integer.parseInt(o1, 2); int b2 = Integer.parseInt(o2, 2); return (b1 > b2 ? 1 : (b1 == b2 ? 0 : -2)); } }); How do I get all the leaf nodes of this tree? 回答1: This doesn't make much sense to me. The elements stored at the leaves are dependent on how the

问题 Treemap package in R seems to have more features than the treemap function in portfolio package. However from the reference manual (which is very good, btw) it does not become clear, whether it is possible to use different color palettes for the first index parameter and use shade (from almost white to the defined color) of a color to map the second index term ( vColor ). I am after something like this: http://visualrevenue.com/media/uploaded_images/news-aggregation-treemap.jpg As an example

问题 CODE IS HERE is a nice and simple example of TreeMap in java to keep track of the key-value pairs added to the map in a sorted order. However, I am unsure on how to ensure that I only keep 10 items in the TreeMap. How to ensure that the size of the TreeMap is always a constant, like 10? So the original problem is: to keep track of the top ten key-value pairs weighted by value in the TreeMap while the stream of key-value keeps coming in. I want to see how the to write the code in java to

问题 This is actually a strange question. I am working on this https://secure.polisci.ohio-state.edu/faq/d3/zoomabletreemap_code.php and currently trying to pass more than one parameter in the treemap and trying to sum them up the stack, as whats mostly done in zoomable treemap. The code documented for this change is given as: // Aggregate the values for internal nodes. This is normally done by the // treemap layout, but not here because of our custom implementation. function accumulate(d) {