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Replacing values for a particular key in treemap changes values for every key


Replacing values for a particular key in treemap changes values for every key

By : Shon Gregersen
Date : November 26 2020, 04:01 AM
wish of those help For some reason when I change a value for a particular key in my tree-map every key value changes for some reason. Here's the code snippet,
code :
for(int i=0; i<n; i++)
{
    a.put(i, bitor);
}


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TreeMap: Sort values of a map with keys moving along with values

TreeMap: Sort values of a map with keys moving along with values


By : compazizo
Date : March 29 2020, 07:55 AM
like below fixes the issue i have the following TreeMap: , you can build a TreeSet, that guarantees insertion order:
code :
@Test
public void treeMapSortedByValue() {
    // given the following map:
    TreeMap<Integer, Double> map = new TreeMap<Integer, Double>();
    map.put(2, Math.E);
    map.put(1, Math.PI);
    map.put(3, 42.0);

    // build a TreeSet of entries
    Set<Map.Entry<Integer, Double>> sortedEntries = new TreeSet<Map.Entry<Integer, Double>>(new DoubleComparator());
    sortedEntries.addAll(map.entrySet());

    // optionally you can build a List<Double> with the sorted 
    List<Double> doubles = new LinkedList<Double>();
    for (Map.Entry<Integer, Double> entry : sortedEntries) {
        doubles.add(entry.getValue());
    }
}
class DoubleComparator implements Comparator<Map.Entry<Integer, Double>> {

    @Override
    public int compare(Entry<Integer, Double> o1, Entry<Integer, Double> o2) {
        return Double.compare(o1.getValue(), o2.getValue());
    }
}
Map column values in TreeMap as key with line number as values

Map column values in TreeMap as key with line number as values


By : Jack Anderson
Date : March 29 2020, 07:55 AM
it helps some times Don't use ArrayList because ArrayList itself is a container to hold your one dimensional line numbers, instead use like below:
code :
TreeMap<Integer, ArrayList<Integer>> clusterMap = new TreeMap<Integer, ArrayList<Integer>>();
if(clusterMap.containsKey(num )){
     clusterMap.get(num).add(lineNumber);
}
else{
    ArrayList<Integer> list = new ArrayList<>();
    list.add(lineNumber);
    clusterMap.put(num, list);
}
subtitude keys and values in TreeMap with other TreeMap in Java

subtitude keys and values in TreeMap with other TreeMap in Java


By : user3316879
Date : March 29 2020, 07:55 AM
Hope this helps Assuming I have a TreeMap first; and TreeMap Origin; And each key and each value in first has an equivalent key in origin. How can I substitute key and values of first with related value from Origin? For example , You have to iterate over the entries on your first TreeMap.
code :
for(Map.Entry<String, List<String>> entry : first.entrySet()) {
String oldKey= entry.getKey();
List<String> oldValues= entry.getValue();
String newKey = origin.get(oldKey);           
List<String> newValues = new ArrayList<>();
for(String s : oldValues) {
    newValues.add(origin.get(s));
}
result.put(newKey, newValues);
TreeMap floorEntry function not working with integer values(Treemap defined as long)

TreeMap floorEntry function not working with integer values(Treemap defined as long)


By : user3680024
Date : March 29 2020, 07:55 AM
it helps some times An IP address is a 32-bit unsigned integer. In Java, ints are 32-bit signed integers.
If you use a signed int to represent an IP address, you'll have to accommodate into your code the fact that the upper half of all IP addresses will in fact be negative.
Java TreeMap sorting based on values removing duplicate values

Java TreeMap sorting based on values removing duplicate values


By : Anamika
Date : March 29 2020, 07:55 AM
Hope this helps The Comparator of a TreeMap is meant to compare keys. Your workaround here basically tells the map that "red" and "green" are the same key, and thus it dropped one of them.
You can look here for how to sort a map by values.
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