Java Guava | Booleans.toArray() method with Examples

The toArray() method of Booleans Class in the Guava library is used to convert the boolean values, passed as the parameter to this method, into a Boolean Array. These boolean values are passed as a Collection to this method. This method returns a Boolean array.

Syntax:

public static boolean[] toArray(Collection<Boolean> collection)

Parameters: This method accepts a mandatory parameter collection which is the collection of boolean values to be converted in to a Boolean array.

Return Value: This method returns a boolean array containing the same values as a collection, in the same order.

Exceptions: This method throws NullPointerException if the passed collection or any of its elements is null.

Below programs illustrate the use of toArray() method:

Example 1:

// Java code to show implementation of 
// Guava's Booleans.toArray() method 

import com.google.common.primitives.Booleans; 

import java.util.Arrays; 

import java.util.List; 

class GFG { 

    // Driver's code 

    public static void main(String[] args) 

    { 

        // Creating a List of Boolean 

        List<Boolean> myList 

            = Arrays.asList(false, true, 

                            false, false); 

        // Using Booleans.toArray() method to convert 

        // a List or Set of Boolean to an array 

        // of Boolean 

        boolean[] arr = Booleans.toArray(myList); 

        // Displaying an array containing each 

        // value of collection, 

        // converted to a boolean value 

        System.out.println(Arrays.toString(arr)); 

    } 
}

Output:

[false, true, false, false]

Example 2:

// Java code to show implementation of 
// Guava's Booleans.toArray() method 

import com.google.common.primitives.Booleans; 

import java.util.Arrays; 

import java.util.List; 

class GFG { 

    // Driver's code 

    public static void main(String[] args) 

    { 

        // Creating a List of Boolean 

        List<Boolean> myList 

            = Arrays.asList(true, true, false); 

        // Using Booleans.toArray() method to convert 

        // a List or Set of Boolean to an array 

        // of Boolean 

        boolean[] arr = Booleans.toArray(myList); 

        // Displaying an array containing each 

        // value of collection, 

        // converted to a boolean value 

        System.out.println(Arrays.toString(arr)); 

    } 
}