In this article, we will discuss how to get all values of a HashMap or implementation classes of Map interface like LinkedHashMap or TreeMap
1. Map implementation classes:
- HashMap –> retrieves values, in random-order of keys
- LinkedHashMap –> retrieves values, as per insertion-order of keys
- TreeMap –> retrieves values, as per some sorting-order of keys
2. To get all values of HashMap :
- use values() method of Map interface
- which returns Collection of values
Syntax:
Collection<String> values = hashMap.values();
GetAllValuesOfHashMap.java
package in.bench.resources.java.map;
import java.util.Collection;
import java.util.HashMap;
public class GetAllValuesOfHashMap {
public static void main(String[] args) {
// creating HashMap object of type <String, String>
HashMap<String, String> hm = new HashMap<String, String>();
// adding key-value pairs to HashMap object
hm.put("Google", "Sundar Pichai");
hm.put("Facebook", "Mark Zuckerberg");
hm.put("LinkedIn", "Reid Hoffman");
hm.put("Apple", "Steve Jobs");
hm.put("Microsoft", "Bill Gates");
System.out.println("all Key-Value pairs:\n\n" + hm + "\n\n");
System.out.println("List of all values: \n");
// Iterating value using values()
Collection<String> founders = hm.values();
for(String founder : founders) {
System.out.println(founder);
}
}
}
Output:
all Key-Value pairs:
{Google=Sundar Pichai, LinkedIn=Reid Hoffman, Apple=Steve Jobs, Microsoft=Bill Gates,
Facebook=Mark Zuckerberg}
List of all values:
Sundar Pichai
Reid Hoffman
Steve Jobs
Bill Gates
Mark Zuckerberg
Related Articles:
- How to get all keys of a HashMap
- How to get all values of a HashMap
- How to get all Entries or Key-Value pairs of HashMap
- How to get size or length of HashMap
- How to check whether a particular key is present in HashMap
- How to check whether a particular value is present in HashMap
- How to check whether HashMap is empty or not ?
- Adding one HashMap to another HashMap using putAll method
- How to delete an entry of HashMap
- How to delete all entries of HashMap
- How to remove an entry from HashMap by comparing values in Java 8
- How to remove an entry from HashMap by comparing keys in Java 8
- Various ways to iterate through HashMap
- To reverse order the LinkedHashMap contents
- Map: How ConcurrentModificationException can be handled in Java
References:
- https://docs.oracle.com/javase/tutorial/collections/intro/
- https://docs.oracle.com/javase/tutorial/collections/interfaces/collection.html
- https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html
- https://docs.oracle.com/javase/7/docs/api/java/util/Map.html
- https://docs.oracle.com/javase/7/docs/api/java/util/Map.Entry.html
- https://docs.oracle.com/javase/tutorial/collections/interfaces/map.html
- https://docs.oracle.com/javase/7/docs/api/java/util/HashMap.html
- https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html
- https://docs.oracle.com/javase/tutorial/collections/interfaces/set.html
- https://docs.oracle.com/javase/7/docs/api/java/util/Set.html
- https://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html
- https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html
- http://docs.oracle.com/javase/6/docs/api/java/util/LinkedHashMap.html
- https://docs.oracle.com/javase/8/docs/api/java/util/LinkedHashMap.html
- https://docs.oracle.com/javase/7/docs/api/java/util/TreeMap.html
- https://docs.oracle.com/javase/8/docs/api/java/util/TreeMap.html
Happy Coding !!
Happy Learning !!
