Java Collection Tutorial - Java TreeMap.firstEntry()

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Syntax

TreeMap.firstEntry() has the following syntax.

public Map.Entry <K , V> firstEntry()

Example

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

/*from  w  w w .j a  va  2 s .  c  o  m*/
import java.util.TreeMap;

public class Main {
   public static void main(String[] args) {
      
      TreeMap<Integer, String>  treemap = 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");
      
      System.out.println("Checking first entry");
      System.out.println("First entry is: "+ treemap.firstEntry());
   }    
}

The code above generates the following result.

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