TreeMap.headMap(K toKey, boolean inclusive) has the following syntax.
public NavigableMap <K , V> headMap(K toKey, boolean inclusive)
In the following code shows how to use TreeMap.headMap(K toKey, boolean inclusive) method.
import java.util.NavigableMap; import java.util.TreeMap; /*from w ww . j a v a 2 s . co m*/ public class Main { public static void main(String[] args) { TreeMap<Integer, String> treemap = new TreeMap<Integer, String> (); NavigableMap<Integer, String> treemapheadincl = new TreeMap<Integer, String> (); // populating tree map treemap.put(2, "two"); treemap.put(1, "one"); treemap.put(3, "three"); treemap.put(6, "six"); treemap.put(5, "from java2s.com"); // getting head map inclusive 3 treemapheadincl=treemap.headMap(3,true); System.out.println("Checking values of the map"); System.out.println("Value is: "+ treemapheadincl); } }
The code above generates the following result.