Java Guava | Booleans.join() method with Examples

The join() method of Booleans Class in the Guava library is used to combine or join all the given boolean values separated by a separator. These boolean values are passed a parameter to this method. This method also takes the separator as the parameter. This method returns a String which is the result of join operation on the specified boolean values.

For example: join(“-“, false, true, false) returns the string “false-true-false”.

Syntax:

public static String join(String separator,
                          boolean... array)

Parameters: This method accepts two mandatory parameters:

separator: which is the character that occurs in between the joined boolean values
array: which is an array of boolean values that are to be joined.

Return Value: This method returns a string containing all the given boolean values separated by separator.

Below programs illustrate the use of this method:

Example-1 :

// Java code to show implementation of 
// Guava's Booleans.join() 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, false, true, 

                          false, true }; 

        // Using Booleans.join() method to get a 

        // string containing the elements of array 

        // separated by a separator 

        System.out.println(Booleans.join("#", arr)); 

    } 
}

Output:

true#false#true#false#true

Example 2 :

// Java code to show implementation of 
// Guava's Booleans.join() 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, false, 

                          true, false }; 

        // Using Booleans.join() method to get a 

        // string containing the elements of array 

        // separated by a separator 

        System.out.println(Booleans.join("*", arr)); 

    } 
}