java.util.TreeMap.entrySet() Method

Description

The entrySet() method is used to return a Set view of the mappings contained in this map. The set's iterator returns the entries in ascending key order. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa.

Declaration

Following is the declaration for java.util.TreeMap.entrySet() method.

public Set<Map.Entry<K,V>> entrySet()

Parameters

NA

Return Value

The method call returns a set view of the mappings contained in this map.

Exception

NA

Example

The following example shows the usage of java.util.TreeMap.entrySet() method.

package com.tutorialspoint;

import java.util.*;

public class TreeMapDemo {
   public static void main(String[] args) {

      // creating tree map 
      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, "five");

      // putting values in set
      Set mapset = treemap.entrySet();

      System.out.println("Checking value");
      System.out.println("Entry set values: "+mapset);
   }    
}

Let us compile and run the above program, this will produce the following result.

Checking value
Entry set values: [1=one, 2=two, 3=three, 5=five, 6=six]

Kickstart Your Career

Get certified by completing the course

Get Started