Java Guava | Doubles.join() method with Examples

The join() method of Doubles Class in the Guava library is used to combine or join all the given double values separated by a separator. These double 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 double values.

For example: join(“-“, 1L, 2L, 3L) returns the string “1-2-3”.

Syntax:

public static String join(String separator, double… array)

Parameters: This method accepts two mandatory parameters:

• separator: which is the doubleacter that occurs in between the joined double values.
• array: which is an array of double values that are to be joined.

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

Below programs illustrate the use of this method:

Example 1:

// Java code to show implementation of
// Guava's Doubles.join() method

import com.google.common.primitives.Doubles;
import java.util.Arrays;

class GFG {

    // Driver's code
    public static void main(String[] args)
    {

        // Creating a double array
        double[] arr = { 2.3, 4.2, 6.2, 8.6, 10.5 };

        // Using Doubles.join() method to get a
        // string containing the elements of array
        // separated by a separator
        System.out.println(Doubles.join("#", arr));
    }
}

Output:

2.3#4.2#6.2#8.6#10.5

Example 2:

// Java code to show implementation of
// Guava's Doubles.join() method

import com.google.common.primitives.Doubles;
import java.util.Arrays;

class GFG {

    // Driver's code
    public static void main(String[] args)
    {

        // Creating a double array
        double[] arr = { 3.2, 5.4, 7.6, 9.1, 11.2 };

        // Using Doubles.join() method to get a
        // string containing the elements of array
        // separated by a separator
        System.out.println(Doubles.join("*", arr));
    }
}

Output:

3.2*5.4*7.6*9.1*11.199999809265137

Reference: https://google.github.io/guava/releases/19.0/api/docs/com/google/common/primitives/Doubles.html#join(java.lang.String, %20double…)