Java Collection Tutorial - Java SortedMap.headMap(K toKey)


SortedMap.headMap(K toKey) has the following syntax.

SortedMap < K , V > headMap(K toKey)


In the following code shows how to use SortedMap.headMap(K toKey) method.

/*from www.jav a  2 s. com*/
import java.util.SortedMap;
import java.util.TreeMap;

public class Main {
  public static void main(String[] args) {
    SortedMap<String, Integer> sortedMap = new TreeMap<String, Integer>();
    sortedMap.put("A", 1);
    sortedMap.put("B", 2);
    sortedMap.put("C", 3);
    sortedMap.put("D", 4);
    sortedMap.put("E", 5);
    sortedMap.put("java2s", 6);
    SortedMap<String, Integer> map = sortedMap.headMap("C");


The code above generates the following result.