Java Collection Tutorial - Java NavigableMap.firstEntry()

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Syntax

NavigableMap.firstEntry() has the following syntax.

Map.Entry < K , V > firstEntry()

Example

In the following code shows how to use NavigableMap.firstEntry() method.

//ww  w . ja  v  a 2  s. c om
import java.util.Iterator;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.TreeMap;

public class Main {
  public static void main(String[] args) {
    NavigableMap<String, Integer> navigableMap = new TreeMap<String, Integer>();
    String[] letters = { "a", "b", "c" };
    int[] ints = { 3, 2, 1 };
    for (int i = 0; i < letters.length; i++){
      navigableMap.put(letters[i], ints[i]);
    }
    System.out.println("Map = " + navigableMap);
    System.out.println("First entry = " + navigableMap.firstEntry());
  }
}

The code above generates the following result.

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