Retrieve the first entry in the TreeMap in Java

Java 8Object Oriented ProgrammingProgramming

Use the firstEntry() method in TreeMap to retrieve the first entry.

Create a TreeMap and add some elements

TreeMap<Integer, String> m = new TreeMap<Integer, String>();
m.put(1,"India");
m.put(2,"US");
m.put(3,"Australia");
m.put(4,"Netherlands");
m.put(5,"Canada");

Now, retrieve the first entry

m.firstEntry()

The following is an example to retrieve first entry in the TreeMap

Example

 Live Demo

import java.util.*;
public class Demo {
   public static void main(String args[]){
      TreeMap<Integer, String> m = new TreeMap<Integer, String>();
      m.put(1,"India");
      m.put(2,"US");
      m.put(3,"Australia");
      m.put(4,"Netherlands");
      m.put(5,"Canada");
      for(Map.Entry e:m.entrySet()){
         System.out.println(e.getKey()+" "+e.getValue());
      }
      System.out.println("First Entry in Map is "+m.firstEntry());
   }
}

Output

1 India
2 US
3 Australia
4 Netherlands
5 Canada
First Entry in Map is 1=India
raja
Published on 17-Jan-2019 10:31:28
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