Java HashMap values() usage and examples

Java HashMap Methods

The Java HashMap values() method returns a view of all values in the HashMap entries.

The syntax of the values() method is：

hashmap.values()

values() parameters

The values() method does not take any parameters.

values() returns values

• returns the hashmappingall valuescollection view

a collection view that displays all values of the hashmap as a collection. The view does not contain the actual values.

Note：The values() method returnsset collection view．This is because, unlike keys and entries, there may be duplicate values in a hashmap.

Example1：Java HashMap values()

import　java.util.HashMap;
class　Main　{
　　public　static　void　main(String[]　args)　{
　　　　//Create a HashMap
　　　　HashMap<String,　Integer>　prices　=　new　HashMap<>();
　　　　//Insert entries into HashMap
　　　　prices.put("Shoes",　200);
　　　　prices.put("Bag",　300);
　　　　prices.put("Pant",　150);
　　　　System.out.println("HashMap:　"　+　prices);
　　　　//returns a view of all values
　　　　System.out.println("Values:　"　+　prices.values());
　　}
}

Output Result

HashMap:　{Pant=150,　Bag=300,　Shoes=200}
Values:　[150,　300,　200]

In the above example, we created a hashmap named prices. Note the expression

prices.values()

Here, the values() method returns a view of all existing values in the hash map.

The values() method can also be used withfor-each loopused together to iterate over each value in the hashmap.

Example2：for-values() method in the each loop

import　java.util.HashMap;
class　Main　{
　　public　static　void　main(String[]　args)　{
　　　　//Create a HashMap
　　　　HashMap<String,　Integer>　numbers　=　new　HashMap<>();
　　　　numbers.put("One",　1);
　　　　numbers.put("Two",　2);
　　　　numbers.put("Three",　3);
　　　　System.out.println("HashMap:　"　+　numbers);
　　　　//Access all values of HashMap
　　　　System.out.print("Values:　");
　　　　//　values() returns a view of all values
　　　　//　for-The each loop accesses each value from the view
　　　　for (int value : numbers.values()) {}}
　　　　　　//Print each value
　　　　　　System.out.print(value　+　", ");
　　　　}
　　}
}

Output Result

HashMap: {One=1, Two=2, Three=3}
Values:　1,　2,　3,

In the above example, we created a hash map named numbers. Note this line,

Integer value: numbers.values()

Here, the values() method returnsall valuesofView. The variable value accesses each value from the view.

NoteThe value of HashMap is of Integer type. Therefore, we use an int variable to access the value.

Recommended Reading

• HashMap keySet() - Return a set view of all keys

• HashMap entrySet() - Return a view of the set of all entries (map)

Java HashMap Methods