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

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));
    }
}
Output:
false*false*true*false

Reference: https://google.github.io/guava/releases/20.0/api/docs/com/google/common/primitives/Booleans.html#join-java.lang.String-boolean…-

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