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Java Guava | Booleans.concat() method with Examples
  • Last Updated : 30 Jan, 2019

The concat() method of Booleans Class in the Guava library is used to concatenate the values of many arrays into a single array. These boolean arrays to be concatenated are specified as parameters to this method.

For example: concat(new boolean[] {a, b}, new boolean[] {}, new boolean[] {c} returns the array {a, b, c}.

Syntax :

public static boolean[] concat(boolean[]... arrays)

Parameter: This method accepts arrays as parameter which is the boolean arrays to be concatenated by this method.

Return Value: This method returns a single boolean array which contains all the specified boolean array values in its original order.



Below programs illustrate the use of concat() method:

Example-1 :




// Java code to show implementation of
// Guava's Booleans.concat() method
  
import com.google.common.primitives.Booleans;
import java.util.Arrays;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
  
        // Creating 2 Boolean arrays
        boolean[] arr1 = { true, false, true };
        boolean[] arr2 = { false, false, false, true };
  
        // Using Booleans.concat() method to combine
        // elements from both arrays into a single array
        boolean[] res = Booleans.concat(arr1, arr2);
  
        // Displaying the single combined array
        System.out.println(Arrays.toString(res));
    }
}
Output:
[true, false, true, false, false, false, true]

Example-2 :




// Java code to show implementation of
// Guava's Booleans.concat() method
  
import com.google.common.primitives.Booleans;
import java.util.Arrays;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
        // Creating 4 boolean arrays
        boolean[] arr1 = { true, false, false };
        boolean[] arr2 = { true, true };
        boolean[] arr3 = { false, false, false };
        boolean[] arr4 = { false, true };
  
        // Using Booleans.concat() method to combine
        // elements from both arrays into a single array
        boolean[] res
            = Booleans.concat(arr1, arr2, arr3, arr4);
  
        // Displaying the single combined array
        System.out.println(Arrays.toString(res));
    }
}
Output:
[true, false, false, true, true, false, false, false, false, true]

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

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