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Guava - Bytes Class
Bytes is a utility class for primitive type byte.
Class Declaration
Following is the declaration for com.google.common.primitives.Bytes class −
@GwtCompatible public final class Bytes extends Object
Methods
Sr.No | Method & Description |
---|---|
1 |
static List<Byte> asList(byte... backingArray) Returns a fixed-size list backed by the specified array, similar to Arrays.asList(Object[]). |
2 |
static byte[] concat(byte[]... arrays) Returns the values from each provided array combined into a single array. |
3 |
static boolean contains(byte[] array, byte target) Returns true if the target is present as an element anywhere in array. |
4 |
static byte[] ensureCapacity(byte[] array, int minLength, int padding) Returns an array containing the same values as the array, but guaranteed to be of a specified minimum length. |
5 |
static int hashCode(byte value) Returns a hash code for value; equal to the result of invoking ((Byte) value).hashCode(). |
6 |
static int indexOf(byte[] array, byte target) Returns the index of the first appearance of the value target in array. |
7 |
static int indexOf(byte[] array, byte[] target) Returns the start position of the first occurrence of the specified target within the array, or -1 if there is no such occurrence. |
8 |
static int lastIndexOf(byte[] array, byte target) Returns the index of the last appearance of the value target in array. |
9 |
static byte[] toArray(Collection<? extends Number> collection) Returns an array containing each value of collection, converted to a byte value in the manner of Number.byteValue(). |
Methods Inherited
This class inherits methods from the following class −
- java.lang.Object
Example of Bytes Class
Create the following java program using any editor of your choice in say C:/> Guava.
GuavaTester.java
import java.util.List; import com.google.common.primitives.Bytes; public class GuavaTester { public static void main(String args[]) { GuavaTester tester = new GuavaTester(); tester.testBytes(); } private void testBytes() { byte[] byteArray = {1,2,3,4,5,5,7,9,9}; //convert array of primitives to array of objects List<Byte> objectArray = Bytes.asList(byteArray); System.out.println(objectArray.toString()); //convert array of objects to array of primitives byteArray = Bytes.toArray(objectArray); System.out.print("[ "); for(int i = 0; i< byteArray.length ; i++) { System.out.print(byteArray[i] + " "); } System.out.println("]"); byte data = 5; //check if element is present in the list of primitives or not System.out.println("5 is in list? " + Bytes.contains(byteArray, data)); //Returns the index System.out.println("Index of 5: " + Bytes.indexOf(byteArray,data)); //Returns the last index maximum System.out.println("Last index of 5: " + Bytes.lastIndexOf(byteArray,data)); } }
Verify the Result
Compile the class using javac compiler as follows −
C:\Guava>javac GuavaTester.java
Now run the GuavaTester to see the result.
C:\Guava>java GuavaTester
See the result.
[1, 2, 3, 4, 5, 5, 7, 9, 9] [ 1 2 3 4 5 5 7 9 9 ] 5 is in list? true Index of 5: 4 Last index of 5: 5