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Doubles Class | Guava | Java
  • Last Updated : 29 May, 2018

Doubles is a utility class for primitive type double. It provides Static utility methods pertaining to double primitives, that are not already found in either Double or Arrays.

Declaration :

@GwtCompatible(emulated=true)
public final class Doubles
extends Object

Below table shows the Field summary for Guava Doubles Class :


Some of the methods provided by Guava Doubles Class are :

Exceptions :

  • min : IllegalArgumentException if array is empty.
  • max : IllegalArgumentException if array is empty.
  • ensureCapacity : IllegalArgumentException if minLength or padding is negative.
  • toArray : NullPointerException if collection or any of its elements is null.

Below table shows some other methods provided by Guava Doubles Class :

Below given are some examples showing the implementation of Guava Doubles Class methods :
Example 1 :






// Java code to show implementation
// of Guava Doubles.asList() method
  
import com.google.common.primitives.Doubles;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        double arr[] = { 2.6, 4.6, 1.2, 2.4, 1.5 };
  
        // Using Doubles.asList() method which
        // converts array of primitives to array of objects
        List<Double> myList = Doubles.asList(arr);
  
        // Displaying the elements
        System.out.println(myList);
    }
}

Output :

[2.6, 4.6, 1.2, 2.4, 1.5]

Example 2 :




// Java code to show implementation
// of Guava Doubles.toArray() method
  
import com.google.common.primitives.Doubles;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        List<Double> myList = Arrays.asList(2.6, 4.6, 1.2, 2.4, 1.5);
  
        // Using Doubles.toArray() method which
        // converts a List of Doubles to an
        // array of double
        double[] arr = Doubles.toArray(myList);
  
        // Displaying the elements
        System.out.println(Arrays.toString(arr));
    }
}

Output :

[2.6, 4.6, 1.2, 2.4, 1.5]

Example 3 :




// Java code to show implementation
// of Guava Doubles.concat() method
  
import com.google.common.primitives.Doubles;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        double[] arr1 = { 2.6, 4.6, 1.2 };
        double[] arr2 = { 2.4, 1.5 };
  
        // Using Doubles.concat() method which
        // combines arrays from specified
        // arrays into a single array
        double[] arr = Doubles.concat(arr1, arr2);
  
        // Displaying the elements
        System.out.println(Arrays.toString(arr));
    }
}

Output :

[2.6, 4.6, 1.2, 2.4, 1.5]

Example 4 :




// Java code to show implementation
// of Guava Doubles.contains() method
  
import com.google.common.primitives.Doubles;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        double[] arr = { 2.6, 4.6, 1.2, 2.4, 1.5 };
  
        // Using Doubles.contains() method which
        // checks if element is present in array
        // or not
        System.out.println(Doubles.contains(arr, 2.5));
        System.out.println(Doubles.contains(arr, 1.5));
    }
}

output :

false
true

Example 5 :




// Java code to show implementation
// of Guava Doubles.min() method
  
import com.google.common.primitives.Doubles;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        double[] arr = { 2.6, 4.6, 1.2, 2.4, 1.5 };
  
        // Using Doubles.min() method
        System.out.println(Doubles.min(arr));
    }
}

Output :

1.2

Example 6 :




// Java code to show implementation
// of Guava Doubles.max() method
  
import com.google.common.primitives.Doubles;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        double[] arr = { 2.6, 4.6, 1.2, 2.4, 1.5 };
  
        // Using Doubles.max() method
        System.out.println(Doubles.max(arr));
    }
}

Output :

4.6

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