The concat() method of Doubles Class in the Guava library is used to concatenate the values of many arrays into a single array. These double arrays to be concatenated are specified as parameters to this method.
For example: concat(new double[] {a, b}, new double[] {}, new double[] {c}
returns the array {a, b, c}.
Syntax:
public static double[] concat(double[]... arrays)
Parameter: This method accepts arrays as parameter which is the double arrays to be concatenated by this method.
Return Value: This method returns a single double array which contains all the specified double array values in its original order.
Below programs illustrate the use of concat() method:
Example 1:
// Java code to show implementation of// Guava's Doubles.concat() method  import com.google.common.primitives.Doubles;import java.util.Arrays;  class GFG {      // Driver's code    public static void main(String[] args)    {        // Creating 2 Double arrays        double[] arr1 = { 1.2, 2.3, 3.5, 4.4, 5.1 };        double[] arr2 = { 6.2, 2.1, 7.2, 0.4, 8.7 };          // Using Doubles.concat() method to combine        // elements from both arrays into a single array        double[] res = Doubles.concat(arr1, arr2);          // Displaying the single combined array        System.out.println(Arrays.toString(res));    }} |
Output:
[1.2, 2.3, 3.5, 4.4, 5.1, 6.2, 2.1, 7.2, 0.4, 8.7]
Example 2:
// Java code to show implementation of// Guava's Doubles.concat() method  import com.google.common.primitives.Doubles;import java.util.Arrays;  class GFG {      // Driver's code    public static void main(String[] args)    {        // Creating 4 Double arrays        double[] arr1 = { 1.2, 2.3, 3.4 };        double[] arr2 = { 4.5, 5.6 };        double[] arr3 = { 6.4, 7.6, 8.7 };        double[] arr4 = { 9.7, 0.8 };          // Using Doubles.concat() method to combine        // elements from both arrays into a single array        double[] res            = Doubles.concat(arr1, arr2, arr3, arr4);          // Displaying the single combined array        System.out.println(Arrays.toString(res));    }} |
Output:
[1.2, 2.3, 3.4, 4.5, 5.6, 6.4, 7.6, 8.7, 9.7, 0.8]
