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Java Guava | Booleans.contains() method with Examples

  • Last Updated : 30 Jan, 2019

The contains() method of Booleans Class in Guava library is used to check if a specified value is present in the specified array of boolean values. The boolean value to be searched and the boolean array in which it is to be searched, are both taken as a parameter.

Syntax :

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public static boolean contains(boolean[] array,
                               boolean target)

Parameters: This method accepts two mandatory parameters:

  • array: which is an array of boolean values in which the target value is to be searched.
  • target: which is the boolean value to be searched for presence in the array.

Return Value: This method returns a boolean value stating whether the target boolean value ispresent in the specified boolean array. It returns True if the target value is present in the array. Else it returns false.



Below programs illustrate the use of contains() method:

Example-1 :




// Java code to show implementation of
// Guava's Booleans.contains() method
  
import com.google.common.primitives.Booleans;
import java.util.Arrays;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
  
        // Creating a Boolean array
        boolean[] arr = { false, true, false,
                          true, true };
  
        boolean target = true;
  
        // Using Booleans.contains() method to search
        // for an element in the array. The method
        // returns true if element is found, else
        // returns false
        if (Booleans.contains(arr, target))
            System.out.println("Target is present "
                               + "in the array");
        else
            System.out.println("Target is not "
                               + "present in the array");
    }
}
Output:
Target is present in the array

Example – 2 :




// Java code to show implementation of
// Guava's Booleans.contains() method
  
import com.google.common.primitives.Booleans;
import java.util.Arrays;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
  
        // Creating a Boolean array
        boolean[] arr = { true, true, true,
                          true, true };
  
        boolean target = false;
  
        // Using Booleans.contains() method to search
        // for an element in the array. The method
        // returns true if element is found, else
        // returns false
        if (Booleans.contains(arr, target))
            System.out.println("Target is present "
                               + "in the array");
        else
            System.out.println("Target is not present "
                               + "in the array");
    }
}
Output:
Target is not present in the array

Reference: https://google.github.io/guava/releases/20.0/api/docs/com/google/common/primitives/Booleans.html#contains-boolean:A-boolean-




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