Longs Class | Guava | Java

Longs is a utility class for primitive type long. It provides Static utility methods pertaining to long primitives, that are not already found in either Long or Arrays.

Declaration :

@GwtCompatible(emulated=true)
public final class Longs
extends Object

Below table shows the Field summary for Guava Longs Class :




Some of the methods provided by Guava Longs Class are :

Exceptions :

  • min : IllegalArgumentException if array is empty.
  • max : IllegalArgumentException if array is empty.
  • fromByteArray : IllegalArgumentException if bytes has fewer than 8 elements.
  • ensureCapacity : IllegalArgumentException if minLength or padding is negative.
  • toArray : NullPointerException if collection or any of its elements is null.

Below table shows some other methods provided by Guava Longs Class :

Below given are some examples showing the implementation of methods of Guava Longs Class :
Example 1 :

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to show implementation
// of Guava Longs.asList() method
  
import com.google.common.primitives.Longs;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        long arr[] = { 3L, 4L, 5L, 6L, 7L };
  
        // Using Longs.asList() method which wraps
        // the primitive long array as List of
        // long Type
        List<Long> myList = Longs.asList(arr);
  
        // Displaying the elements
        System.out.println(myList);
    }
}

chevron_right


Output :

[3, 4, 5, 6, 7]

Example 2 :

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to show implementation
// of Guava Longs.toArray() method
  
import com.google.common.primitives.Longs;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        List<Long> myList = Arrays.asList(3L, 4L, 5L, 6L, 7L);
  
        // Using Longs.toArray() method which
        // converts a List of Longs to an
        // array of long
        long[] arr = Longs.toArray(myList);
  
        // Displaying the elements
        System.out.println(Arrays.toString(arr));
    }
}

chevron_right


Output :

[3, 4, 5, 6, 7]

Example 3 :

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to show implementation
// of Guava Longs.concat() method
  
import com.google.common.primitives.Longs;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        long[] arr1 = { 3L, 4L, 5L };
        long[] arr2 = { 6L, 7L };
  
        // Using Longs.concat() method which
        // combines arrays from specified
        // arrays into a single array
        long[] arr = Longs.concat(arr1, arr2);
  
        // Displaying the elements
        System.out.println(Arrays.toString(arr));
    }
}

chevron_right


Output :

[3, 4, 5, 6, 7]

Example 4 :

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to show implementation
// of Guava Longs.contains() method
  
import com.google.common.primitives.Longs;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        long[] arr = { 3L, 4L, 5L, 6L };
  
        // Using Longs.contains() method which
        // checks if element is present in array
        // or not
        System.out.println(Longs.contains(arr, 4L));
        System.out.println(Longs.contains(arr, 7L));
    }
}

chevron_right


output :

true
false

Example 5 :

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to show implementation
// of Guava Longs.min() method
  
import com.google.common.primitives.Longs;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        long[] arr = { 3L, 4L, 5L, 6L };
  
        // Using Longs.min() method
        System.out.println(Longs.min(arr));
    }
}

chevron_right


Output :

3

Example 6 :

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to show implementation
// of Guava Longs.max() method
  
import com.google.common.primitives.Longs;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        long[] arr = { 3L, 4L, 5L, 6L };
  
        // Using Longs.max() method
        System.out.println(Longs.max(arr));
    }
}

chevron_right


Output :

6


My Personal Notes arrow_drop_up

In love with a semicolon because sometimes i miss it so badly)

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.




Article Tags :
Practice Tags :


Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.