Java Guava | Doubles.join() method with Examples

Last Updated : 31 Jan, 2019

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)); 
    } 
} 