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In Java, SortedMap is an interface of Collection framework. SortedMap extends Map interface and also provide the ordering of the elements. Traversing the sorted elements becomes easier.
| S.no. | Methods | Description |
|---|---|---|
| 1 | subMap(K fromKey, K toKey) | It is used to view the elements from a given range |
| 2 | headMap(K toKey) | It is used to get the key which is less than than the toKey. |
| 3 | tailMap(K fromKey) | It is used to get the key which is greater than or equal to the fromKey. |
| 4 | firstKey() | It is used to get the lowest key. |
| 5 | lastKey() | It is used to get the highest key. |
| 6 | comparator() | It is used to get the comparator used in the Map. |
| 7 | values() | It is used to get the values of the Map |
| 8 | keySet() | It is used to get the set view from the Map. |
| 9 | entrySet() | It is used to get the set view of the mapping which are contained in the map. |
Example:
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
public class SortedMapDemo1
{
public static void main(String[] args)
{
SortedMap<Integer, String> a = new TreeMap<Integer, String>();
a.put(new Integer(2), "Red");
a.put(new Integer(3), "Pink");
a.put(new Integer(5), "Yellow");
a.put(new Integer(4), "Black");
a.put(new Integer(1), "Green");
Set b = a.entrySet();
Iterator i = b.iterator();
while (i.hasNext())
{
Map.Entry c = (Map.Entry)i.next();
int key1 = (Integer)c.getKey();
String value1 = (String)c.getValue();
System.out.println("Key : " + key1 + " || value : " + value1);
}
}
}
