Java HashMap values() Method

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Description

The Java HashMap values() method is used to return a Collection view of the values contained in this map.

Declaration

Following is the declaration for java.util.HashMap.values() method.

public Collection<V> values()

Parameters

NA

Return Value

The method call returns a collection view of the values contained in this map.

Exception

NA

Getting collection view of values of HashMap of Integer, Integer Pair Example

The following example shows the usage of Java HashMap values() method to get a Collection of values of a Map. We've created a Map object of Integer,Integer pair. Then few entries are added, map is printed. Using values() method, collection is retrieved and printed.

package com.tutorialspoint;

import java.util.HashMap;

public class HashMapDemo {
   public static void main(String args[]) {
      
      // create hash map
      HashMap<Integer,Integer> newmap = new HashMap<>();

      // populate hash map
      newmap.put(1, 1);
      newmap.put(2, 2);
      newmap.put(3, 3); 

      System.out.println("Initial map elements: " + newmap);

      System.out.println("Collection view: " + newmap.values());
   }
}

Output

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

Initial map elements: {1=1, 2=2, 3=3}
Collection view: [1, 2, 3]

Getting collection view of values of HashMap of Integer, String Pair Example

The following example shows the usage of Java HashMap values() method to get a Collection of values of a Map. We've created a Map object of Integer,String pair. Then few entries are added, map is printed. Using values() method, collection is retrieved and printed.

package com.tutorialspoint;

import java.util.HashMap;

public class HashMapDemo {
   public static void main(String args[]) {
      
      // create hash map
      HashMap<Integer,String> newmap = new HashMap<>();

      // populate hash map
      newmap.put(1, "tutorials");
      newmap.put(2, "point");
      newmap.put(3, "is best"); 

      System.out.println("Initial map elements: " + newmap);

      System.out.println("Collection view: " + newmap.values());
   }
}

Output

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

Initial map elements: {1=tutorials, 2=point, 3=is best}
Collection view: [tutorials, point, is best]

Getting collection view of values of HashMap of Integer, Student Pair Example

The following example shows the usage of Java HashMap values() method to get a Collection of values of a Map. We've created a Map object of Integer,Student pair. Then few entries are added, map is printed. Using values() method, collection is retrieved and printed.

package com.tutorialspoint;

import java.util.HashMap;

public class HashMapDemo {
   public static void main(String args[]) {
      
      // create hash map
      HashMap<Integer,Student> newmap = new HashMap<>();

      // populate hash map
      newmap.put(1, new Student(1, "Julie"));
      newmap.put(2, new Student(2, "Robert"));
      newmap.put(3, new Student(3, "Adam"));

      System.out.println("Initial map elements: " + newmap);

      System.out.println("Collection view: " + newmap.values());
   }
}
class Student {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
}

Output

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

Initial map elements: {1=[ 1, Julie ], 2=[ 2, Robert ], 3=[ 3, Adam ]}
Collection view: [[ 1, Julie ], [ 2, Robert ], [ 3, Adam ]]