Java Guava | Doubles.asList() method with Examples

Last Updated : 01 Feb, 2019

The Doubles.asList() method of Guava’s Doubles Class accepts a double array as a parameter and returns a list which has the fixed size. The returned list is backed by the double array which is passed as the argument. It means the changes made in the array passed as parameter will be reflected back in the list returned by the method and vice-versa.

Syntax:

public static List<Double> asList(double… backingArray)

Parameter: The method accepts a mandatory parameter backingArray which is a double array that is used to back the list.

Return Value: The method Doubles.asList() returns a fixed-size list which is backed by the array passed as the argument to the method. In other words, the method returns the list view of the array.

Below examples illustrate the implementation of above method:

Example 1:

// Java code to show implementation of 
// Guava's Doubles.asList() method 
  
import com.google.common.primitives.Doubles; 
import java.util.List; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating a Double array 
        double arr[] = { 1.2, 2.3, 3.4, 4.5, 5.6 }; 
  
        // Using Doubles.asList() method to wrap 
        // the specified primitive Double array 
        // as a List of the Double type 
        List<Double> myList = Doubles.asList(arr); 
  
        // Displaying the elements in List 
        System.out.println(myList); 
    } 
} 

Output:

[1.2, 2.3, 3.4, 4.5, 5.6]

Example 2:

// Java code to show implementation of 
// Guava's Doubles.asList() method 
  
import com.google.common.primitives.Doubles; 
import java.util.List; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating a Double array 
        double arr[] = { 3.2, 5.5, 7.6 }; 
  
        // Using Doubles.asList() method to wrap 
        // the specified primitive Double array 
        // as a List of the Double type 
        List<Double> myList = Doubles.asList(arr); 
  
        // Displaying the elements in List 
        System.out.println(myList); 
    } 
} 