HashMap getOrDefault(key, defaultValue) method in Java with Examples

The getOrDefault(Object key, V defaultValue) method of Map interface, implemented by HashMap class is used to get the value mapped with specified key. If no value is mapped with the provided key then the default value is returned.

Syntax:

default V getOrDefault(Object key, V defaultValue)

Parameters: This method accepts two parameters:



  • key: which is the key of the element whose value has to be obtained.
  • defaultValue: which is the default value that has to be returned, if no value is mapped with the specified key.

Return Value: This method returns value mapped with the specified key, otherwise default value is returned.

Program 1:

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// Java program to demonstrate
// getOrDefault(Object key, V defaultValue) method
  
import java.util.*;
  
public class GFG {
  
    // Main method
    public static void main(String[] args)
    {
  
        // Create a HashMap and add some values
        HashMap<String, Integer> map
            = new HashMap<>();
        map.put("a", 100);
        map.put("b", 200);
        map.put("c", 300);
        map.put("d", 400);
  
        // print map details
        System.out.println("HashMap: "
                           + map.toString());
  
        // provide key whose value has to be obtained
        // and default value for the key. Store the
        // return value in k
        int k = map.getOrDefault("b", 500);
  
        // print the value of k returned by
        // getOrDefault(Object key, V defaultValue) method
        System.out.println("Returned Value: " + k);
    }
}

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Output:

HashMap: {a=100, b=200, c=300, d=400}
Returned Value: 200

Program 2:

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// Java program to demonstrate
// getOrDefault(Object key, V defaultValue) method
  
import java.util.*;
  
public class GFG {
  
    // Main method
    public static void main(String[] args)
    {
  
        // Create a HashMap and add some values
        HashMap<String, Integer> map
            = new HashMap<>();
        map.put("a", 100);
        map.put("b", 200);
        map.put("c", 300);
        map.put("d", 400);
  
        // print map details
        System.out.println("HashMap: "
                           + map.toString());
  
        // provide key whose value has to be obtained
        // and default value for the key. Store the
        // return value in k
        int k = map.getOrDefault("y", 500);
  
        // print the value of k returned by
        // getOrDefault(Object key, V defaultValue) method
        System.out.println("Returned Value: " + k);
    }
}

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Output:

HashMap: {a=100, b=200, c=300, d=400}
Returned Value: 500

References: https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html#getOrDefault-java.lang.Object-V-



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