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 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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