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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}.

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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 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 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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