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 :
// 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);    }} |
Output :
[3, 4, 5, 6, 7]
Example 2 :
// 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));    }} |
Output :
[3, 4, 5, 6, 7]
Example 3 :
// 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));    }} |
Output :
[3, 4, 5, 6, 7]
Example 4 :
// 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));    }} |
output :
true false
Example 5 :
// 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));    }} |
Output :
3
Example 6 :
// 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));    }} |
Output :
6
[…] lastIndexOf() method of Longs Class in Guava library is used to find the last index of the given long value in a long array. This long […]