Booleans is a utility class for primitive type Boolean. It provides Static utility methods pertaining to boolean primitives, that are not already found in either Boolean or Arrays.
Declaration :
@GwtCompatible(emulated=true) public final class Booleans extends Object
Below given are some methods provided by Guava Booleans Class : 
Exceptions :
- ensureCapacity : IllegalArgumentException if minLength or padding is negative.
- toArray : NullPointerException if collection or any of its elements is null.
Following table shows some other methods provided by Guava Booleans Class :
Below given are some examples showing the implementation of Guava Booleans Class methods :
Example 1 :
Java
// Java code to show implementation// of Guava Booleans.asList() methodimport com.google.common.primitives.Booleans;import java.util.*;class GFG { // Driver method public static void main(String[] args) { boolean arr[] = { true, false, true, false, true }; // Using Booleans.asList() method which // converts array of primitives to array of objects List<Boolean> myList = Booleans.asList(arr); // Displaying the elements System.out.println(myList); }} |
Output :
[true, false, true, false, true]
Example 2 :
Java
// Java code to show implementation// of Guava Booleans.toArray() methodimport com.google.common.primitives.Booleans;import java.util.*;class GFG { // Driver method public static void main(String[] args) { List<Boolean> myList = Arrays.asList(true, false, true, false, true); // Using Booleans.toArray() method which // converts a List of Booleans to an // array of boolean boolean[] arr = Booleans.toArray(myList); // Displaying the elements System.out.println(Arrays.toString(arr)); }} |
Output :
[true, false, true, false, true]
Example 3 :
Java
// Java code to show implementation// of Guava Booleans.concat() methodimport com.google.common.primitives.Booleans;import java.util.*;class GFG { // Driver method public static void main(String[] args) { boolean[] arr1 = { true, false, true }; boolean[] arr2 = { false, true }; // Using Booleans.concat() method which // combines arrays from specified // arrays into a single array boolean[] arr = Booleans.concat(arr1, arr2); // Displaying the elements System.out.println(Arrays.toString(arr)); }} |
Output :
[true, false, true, false, true]
Example 4 :
Java
// Java code to show implementation// of Guava Booleans.contains() methodimport com.google.common.primitives.Booleans;class GFG { // Driver method public static void main(String[] args) { boolean[] arr = { true, false, true, false, true }; // Using Booleans.contains() method which // checks if element is present in array // or not System.out.println(Booleans.contains(arr, true)); System.out.println(Booleans.contains(arr, false)); }} |
output :
true true
Example 5 :
Java
// Java code to show implementation// of Guava Booleans.compare() methodimport com.google.common.primitives.Booleans;class GFG { // Driver method public static void main(String[] args) { // To compare true vs true System.out.println(Booleans.compare(true, true)); }} |
Output :
0
Example 6 :
Java
// Java code to show implementation// of Guava Booleans.indexOf() methodimport com.google.common.primitives.Booleans;class GFG { // Driver method public static void main(String[] args) { boolean[] arr = { true, false, true, false, true }; // To print index of first occurrence of false System.out.println(Booleans.indexOf(arr, false)); }} |
Output :
1
