Java TreeMap.headMap(K toKey)
Syntax
TreeMap.headMap(K toKey) has the following syntax.
public SortedMap < K , V > headMap(K toKey)
Example
In the following code shows how to use TreeMap.headMap(K toKey) method.
import java.util.SortedMap;
import java.util.TreeMap;
//w ww. j a v a2 s. c o m
public class Main {
public static void main(String[] args) {
TreeMap<Integer, String> treemap = new TreeMap<Integer, String> ();
SortedMap<Integer, String> treemaphead = 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
treemaphead=treemap.headMap(3);
System.out.println("Checking values of the sorted map");
System.out.println("Value is: "+ treemaphead);
}
}
The code above generates the following result.
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