Java Collection Tutorial - Java SortedMap.firstKey()

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Syntax

SortedMap.firstKey() has the following syntax.

K firstKey()

Example

In the following code shows how to use SortedMap.firstKey() method.

//ww  w .  ja  v a  2 s.  c om
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);
      
    System.out.println(sortedMap.firstKey());

  }
}

The code above generates the following result.

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