Category Archives: collections

how To sort a hashmap using its keys and/or values

To sort a hashmap using its keys :- Dump the HashMap into a TreeMap: Map yourMap= new HashMap(); // put some tuples in yourMap … Map sortedMap = new TreeMap(yourMap); To sort a hashmap using its values :- public HashMap getSortedMap(HashMap hmap) … Continue reading

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[Java] Reverse ordering a TreeMap

TreeMap is a Map that keep the element in the natural order of the key. The order can be changed providing to the contructor of the TreeMap a Comparable. So you can implement your custom one for more specific tasks. However if you only … Continue reading

Posted in collections