Java Guava | Longs.concat() method with Examples
Last Updated :
31 Jan, 2019
The
concat() method of
Longs Class in the Guava library is used to concatenate the values of many arrays into a single array. These long arrays to be concatenated are specified as parameters to this method.
For example: concat(new long[] {1, 2}, new long[] {3, 4, 5}, new long[] {6, 7}
returns the array {1, 2, 3, 4, 5, 6, 7}.
Syntax:
public static long[] concat(long[]... arrays)
Parameter: This method accepts
arrays as parameter which is the long arrays to be concatenated by this method.
Return Value: This method returns a single long array which contains all the specified long array values in its original order.
Below programs illustrate the use of concat() method:
Example 1:
Java
// Java code to show implementation of
// Guava's Longs.concat() method
import com.google.common.primitives.Longs;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating 2 Long arrays
long[] arr1 = { 1, 2, 3, 4, 5 };
long[] arr2 = { 6, 2, 7, 0, 8 };
System.out.println("Long Array 1: "
+ Arrays.toString(arr1));
System.out.println("Long Array 2: "
+ Arrays.toString(arr2));
// Using Longs.concat() method to combine
// elements from both arrays
// into a single array
long[] res = Longs.concat(arr1, arr2);
// Displaying the single combined array
System.out.println("Combined Array: "
+ Arrays.toString(res));
}
}
Output:
Long Array 1: [1, 2, 3, 4, 5]
Long Array 2: [6, 2, 7, 0, 8]
Combined Array: [1, 2, 3, 4, 5, 6, 2, 7, 0, 8]
Example 2:
Java
// Java code to show implementation of
// Guava's Longs.concat() method
import com.google.common.primitives.Longs;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating 4 long arrays
long[] arr1 = { 1, 2, 3 };
long[] arr2 = { 4, 5 };
long[] arr3 = { 6, 7, 8 };
long[] arr4 = { 9, 0 };
System.out.println("Long Array 1: "
+ Arrays.toString(arr1));
System.out.println("Long Array 2: "
+ Arrays.toString(arr2));
System.out.println("Long Array 3: "
+ Arrays.toString(arr3));
System.out.println("Long Array 4: "
+ Arrays.toString(arr4));
// Using Longs.concat() method to combine
// elements from both arrays
// into a single array
long[] res
= Longs
.concat(arr1, arr2, arr3, arr4);
// Displaying the single combined array
System.out.println("Combined Array: "
+ Arrays.toString(res));
}
}
Output:
Long Array 1: [1, 2, 3]
Long Array 2: [4, 5]
Long Array 3: [6, 7, 8]
Long Array 4: [9, 0]
Combined Array: [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
Reference: https://google.github.io/guava/releases/21.0/api/docs/com/google/common/primitives/Longs.html#concat-long:A...-
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