Booleans is a utility class for primitive type Boolean.
Class Declaration
Following is the declaration for com.google.common.primitives.Booleans class −
@GwtCompatible(emulated = true)
public final class Booleans
extends Object
Methods
| Sr.No | Method & Description |
|---|---|
| 1 | static List<Boolean> asList(boolean… backingArray)Returns a fixed-size list backed by the specified array, similar to Arrays.asList(Object[]). |
| 2 | static int compare(boolean a, boolean b)Compares the two specified boolean values in the standard way (false is considered less than true). |
| 3 | static boolean[] concat(boolean[]… arrays)Returns the values from each provided array combined into a single array. |
| 4 | static boolean contains(boolean[] array, boolean target)Returns true if target is present as an element anywhere in array. |
| 5 | static int countTrue(boolean… values)Returns the number of values that are true. |
| 6 | static boolean[] ensureCapacity(boolean[] array, int minLength, int padding)Returns an array containing the same values as array, but guaranteed to be of a specified minimum length. |
| 7 | static int hashCode(boolean value)Returns a hash code for value; equal to the result of invoking ((Boolean) value).hashCode(). |
| 8 | static int indexOf(boolean[] array, boolean target)Returns the index of the first appearance of the value target in array. |
| 9 | static int indexOf(boolean[] array, boolean[] target)Returns the start position of the first occurrence of the specified target within array, or -1 if there is no such occurrence. |
| 10 | static String join(String separator, boolean… array)Returns a string containing the supplied boolean values separated by separator. |
| 11 | static int lastIndexOf(boolean[] array, boolean target)Returns the index of the last appearance of the value target in array. |
| 12 | static Comparator<boolean[]> lexicographicalComparator()Returns a comparator that compares two boolean arrays lexicographically. |
| 13 | static boolean[] toArray(Collection<Boolean> collection)Copies a collection of Boolean instances into a new array of primitive boolean values. |
Methods Inherited
This class inherits methods from the following class −
- java.lang.Object
Example of Booleans Class
Create the following java program using any editor of your choice in say C:/> Guava
GuavaTester.java
import java.util.List;
import com.google.common.primitives.Booleans;
public class GuavaTester {
public static void main(String args[]) {
GuavaTester tester = new GuavaTester();
tester.testBooleans();
}
private void testBooleans() {
boolean[] booleanArray = {true,true,false,true,true,false,false};
//convert array of primitives to array of objects
List<Boolean> objectArray = Booleans.asList(booleanArray);
System.out.println(objectArray.toString());
//convert array of objects to array of primitives
booleanArray = Booleans.toArray(objectArray);
System.out.print("[ ");
for(int i = 0; i< booleanArray.length ; i++) {
System.out.print(booleanArray[i] + " ");
}
System.out.println("]");
//check if element is present in the list of primitives or not
System.out.println("true is in list? " + Booleans.contains(booleanArray, true));
//return the first index of element
System.out.println("true position in list " + Booleans.indexOf(booleanArray, true));
//Returns the count of true values
System.out.println("true occured: " + Booleans.countTrue());
//Returns the comparisons
System.out.println("false Vs true: " + Booleans.compare(false, true));
System.out.println("false Vs false: " + Booleans.compare(false, false));
System.out.println("true Vs false: " + Booleans.compare(true, false));
System.out.println("true Vs true: " + Booleans.compare(true, true));
}
}
Verify the Result
Compile the class using javac compiler as follows −
C:\Guava>javac GuavaTester.java
Now run the GuavaTester to see the result.
C:\Guava>java GuavaTester
See the result.
[true, true, false, true, true, false, false] [ true true false true true false false ] true is in list? true true position in list 0 true occured: 0 false Vs true: -1 false Vs false: 0 true Vs false: 1 true Vs true: 0
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