treemap

Solved : I have created an adapter based on @JJV 's suggestion. I am aware that there is plenty of room for improvement, but it works for now. I have updated this simplified version of my program, with the working code; I hope it will be useful to others: MainActivity.java: import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.widget.ListAdapter; import android.widget.ListView; import java.util.Map; import java.util.TreeMap; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate

I have written the below code to find out the key(String) that has the maximum value(Integer) using TreeMap in JAVA. public static void maxprofitItem(int[] costs, int[] prices, int[] sales,String[] items) { TreeMap<String,Integer>map=new TreeMap<String,Integer>(); int[] profits=new int[items.length]; int maxvalue; for(int i=0;i<items.length;i++){ profits[i]=sales[i]*prices[i]-costs[i]*sales[i]; if(profits[i]>0){ map.put(items[i],profits[i]); } } Set setOfKeys = map.keySet(); Iterator iterator = setOfKeys.iterator(); while (iterator.hasNext()) { String key = (String) iterator.next(); Integer

1. Map概览 Java SE中有四种常见的Map实现——HashMap, TreeMap, Hashtable和LinkedHashMap。如果我们使用一句话来分别概括它们的特点，就是： HashMap就是一张hash表，键和值都没有排序。 TreeMap以红-黑树结构为基础，键值按顺序排列。 LinkedHashMap保存了插入时的顺序。 Hashtable是同步的(而HashMap是不同步的)。所以如果在线程安全的环境下应该多使用HashMap，而不是Hashtable，因为Hashtable对同步有额外的开销。 HashMap 如果HashMap的键(key)是自定义的对象，那么需要 按规则定义它的equals()和hashCode()方法 。 class Dog { String color; Dog(String c) { color = c; } public String toString(){ return color + " dog"; } } public class TestHashMap { public static void main(String[] args) { HashMap hashMap = new HashMap(); Dog d1 = new Dog("red"); Dog d2 = new Dog("black"); Dog d3

I was trying to get a d3 treemap to animate, and had something like App.svg = d3.select("#medals-tree-map").append("svg:svg") .style("width", App.canvasWidth) .style("height", App.canvasHeight) .append("svg:g") .attr("transform", "translate(-.5,-.5)") .attr("id", "container"); App.treemap = d3.layout.treemap() .size([App.canvasWidth + 1, App.canvasHeight + 1]) .value(function(d) { return d.number; }) .sticky(true); function drawGraphFromJson(data) { // Draw the graph var leaves = App.treemap(data); var cell = App.svg.selectAll("g.cell") .data(leaves); // More rendering code } Based on this

Possible Duplicate: How to sort a Map<Key, Value> on the values in Java? I need sorted map like TreeMap but sorted by value. My map will be huge, so i can't just sort my map anytime i need. Exist any good solution to resolve this problem? Maybe exist external jar who meets this? There are a number of ways to satisfy your requirement. As you have subsequently clarified that you may have duplicate objects in your current TreeMap , perhaps you could replace your TreeMap with a third-party multimap ( Guava , Apache Commons Collections ), then swap your keys and values around - i.e. replace TreeMap

I need a Collection that sorts the element, but does not removes the duplicates. I have gone for a TreeSet , since TreeSet actually adds the values to a backed TreeMap : public boolean add(E e) { return m.put(e, PRESENT)==null; } And the TreeMap removes the duplicates using the Comparators compare logic I have written a Comparator that returns 1 instead of 0 in case of equal elements. Hence in the case of equal elements the TreeSet with this Comparator will not overwrite the duplicate and will just sort it. I have tested it for simple String objects, but I need a Set of Custom objects. public

I am using the Google-Charts Treemap to display a very large number of nodes. The default behavior is to move down the tree when a user left-clicks a node and to move back up the tree when a user right-clicks the graph. The right-clicks redraw the chart for each click. The redraw is very slow because of the large number of nodes. How to disable the node move down function without disabling the mouse click event? How to improve the performance of treemap draw? Thanks the node move down function occurs when a chart element is selected to disable , clear the selection when the 'select' event