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Java Guava | Doubles.concat() method with Examples

Last Updated : 11 Jul, 2025
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:
Output:
[1.2, 2.3, 3.5, 4.4, 5.1, 6.2, 2.1, 7.2, 0.4, 8.7]
Example 2:
Output:
[1.2, 2.3, 3.4, 4.5, 5.6, 6.4, 7.6, 8.7, 9.7, 0.8]
Reference: https://guava.dev/releases/19.0/api/docs/com/google/common/primitives/Doubles.html#concat(double%5B%5D...)
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