The **`values()` method** of the `HashMap` class in Java returns a [Collection](https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html) view of the values present in a `HashMap` instance.

The process is illustrated below:

To use the `values()` method, you will need to import the `HashMap` class into the program, as shown below:

```Java
import java.util.HashMap;
```

The prototype of the `values()` method is shown below:

```Java
public Collection<V> values()
```

# Parameters

The `values()` method does not take any parameters.

# Return value

The `values()` method returns a `Collection` view of the values present in a `HashMap` instance.

If there are duplicate values in the `HashMap`, they are all returned as part of the view.

# Example

The code below shows how the `values()` method works in Java:

import java.util.HashMap;

class Main {
  public static void main(String[] args)
  {
    // initializing HashMap
    HashMap<String, Integer> vehicles = new HashMap<>();

    // populating HashMap
    vehicles.put("Car", 1);
    vehicles.put("Bus", 2);
    vehicles.put("Truck", 3);
    vehicles.put("Bike", 1);

    // view all values in the HashMap
    System.out.println("The HashMap contains the following values: " + vehicles.values());
  }
}

# Explanation

First, a `HashMap` object `vehicles` is initialized.

Next, *key-value* pairs are inserted into the `HashMap`. The value $1$ is used for two entries: "Car" and "Bike". All other entries have unique values.

The `values` method in line $16$ proceeds to return a `Collection` view of all the values in the `HashMap`. The `HashMap` contains a duplicate for the value $1$, so the view contains two occurrences of the value $1$.



What is the values() method of the HashMap class in Java?

The values() method in Java's HashMap returns a Collection view of the present values, including duplicates.