SortedMap entrySet() method in Java with Examples
The entrySet() method of SortedMap interface in Java is used to create a set out of the same elements contained in the map. It basically returns a set view of the map or creates a new set and store the map elements into them.
Syntax:
SortedMap.entrySet()
Parameters: The method does not take any parameter.
Return Value: The method returns a set having same elements as the map.
Below programs are used to illustrate the working of above method:
Program 1: Using HashMap.
// Java code to illustrate the entrySet() method import java.util.*; public class SortedMap_Demo { public static void main(String[] args) { // Creating an empty TreeMap SortedMap<String, Integer> sotree_map = new TreeMap<String, Integer>(); // Mapping int values to string keys sotree_map.put( "Beginner" , 10 ); sotree_map.put( "4" , 15 ); sotree_map.put( "Beginner" , 20 ); sotree_map.put( "Welcomes" , 25 ); sotree_map.put( "You" , 30 ); // Displaying the TreeMap System.out.println( "Initial Mappings are: " + sotree_map); // Using entrySet() to get the set view System.out.println( "The set is: " + sotree_map.entrySet()); } } |
Program 2:
// Java code to illustrate the entrySet() method import java.util.*; public class SortedMap_Demo { public static void main(String[] args) { // Creating an empty TreeMap SortedMap<Integer, String> sotree_map = new TreeMap<Integer, String>(); // Mapping string values to int keys sotree_map.put( 10 , "Beginner" ); sotree_map.put( 15 , "4" ); sotree_map.put( 20 , "Beginner" ); sotree_map.put( 25 , "Welcomes" ); sotree_map.put( 30 , "You" ); // Displaying the TreeMap System.out.println( "Initial Mappings are: " + sotree_map); // Using entrySet() to get the set view System.out.println( "The set is: " + sotree_map.entrySet()); } } |
Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.