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Java Guava | Booleans.indexOf(boolean[] array, boolean[] target) method with Examples

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  • Last Updated : 20 Nov, 2019
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Booleans.indexOf(boolean[] array, boolean[] target) method of Guava’s Booleans Class accepts two parameters array and target. If the target exists within the array, the method returns the start position of its first occurrence. If the target does not exist within the array, the method returns -1.

Syntax:

public static int indexOf(boolean[] array,
                          boolean[] target)

Parameters: The method accepts two parameters :

  • array: An array to search for the sequence target.
  • target: An array to search for as a sub-sequence of array.

Return Value: The method returns:

  • Start position of first occurrence of the target, if the target exists in the array.
  • -1 if the target does not exist in the array.

Exceptions: The method does not throw any exception.

Below examples illustrate the implementation of above method :

Example 1:




// Java code to show implementation of
// Guava's Booleans.indexOf(boolean[] array,
// boolean[] target) 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,
                          false, true };
  
        boolean[] target = { false, false };
  
        // Using indexOf(boolean[] array, boolean[] target)
        // method to get the start position of the first
        // occurrence of the specified target within array,
        // or -1 if there is no such occurrence.
        int index = Booleans.indexOf(arr, target);
  
        if (index != -1) {
            System.out.println("Target is present at index "
                               + index);
        }
        else {
            System.out.println("Target is not present "
                               + "in the array");
        }
    }
}

Example 2 :




// Java code to show implementation of
// Guava's Booleans.indexOf(boolean[] array,
// boolean[] target) 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,
                          false, true };
  
        boolean[] target = { false, false, false };
  
        // Using indexOf(boolean[] array, boolean[] target)
        // method to get the start position of the first
        // occurrence of the specified target within array,
        // or -1 if there is no such occurrence.
        int index = Booleans.indexOf(arr, target);
  
        if (index != -1) {
            System.out.println("Target is present at index "
                               + index);
        }
        else {
            System.out.println("Target is not present "
                               + "in the array");
        }
    }
}

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


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