Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind Java HashMap getOrDefault() Method?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Fill blank
Complete the missing token from the example code.
___ java.util.HashMap;3Order
Put the learning moves in the order that makes the concept easiest to apply.
The getOrDefault() method returns the value of the entry in the map which has a specified key.
Definition and Usage
Java HashMap getOrDefault() Method
❮ HashMap Methods
Example
import java.util.HashMap;
public class Main {
public static void main(String[] args) {
HashMap<String, String> capitalCities = new HashMap<String, String>();
capitalCities.put("England", "London");
capitalCities.put("Germany", "Berlin");
capitalCities.put("Norway", "Oslo");
capitalCities.put("USA", "Washington DC");
System.out.println(capitalCities.getOrDefault("England", "Unknown"));
System.out.println(capitalCities.getOrDefault("Canada", "Unknown"));
}
}Definition and Usage
The getOrDefault() method returns the value of the entry in the map which has a specified key. If the entry does not exist then the value of the second parameter is returned.
Syntax
public V getOrDefault(Object
key , V
def )V refers to the data type of the values of the map.
Parameter Values
| Parameter | Description |
|---|---|
| key | Required. Specifies the key of the entry to get the value from. |
| def | Required. Specifies the default value to return if an entry is not found. |
Technical Details
| Returns: | The value of the entry with the specified key or the value of the def argument if an entry with that key does not exist. |
|---|