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Bytes Class | Guava | Java
  • Last Updated : 20 Nov, 2019

Bytes is a utility class for primitive type byte. It provides Static utility methods pertaining to byte primitives, that are not already found in either Byte or Arrays and interpret bytes as neither signed nor unsigned. The methods which specifically treat bytes as signed or unsigned are found in SignedBytes and UnsignedBytes.

Declaration :

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

Below table shows the methods provided by Guava Bytes Class :

Exceptions :



  • ensureCapacity : IllegalArgumentException if minLength or padding is negative.
  • toArray : NullPointerException if collection or any of its elements is null.

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




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

Output :

[3, 4, 5, 6, 7]

Example 2 :




// Java code to show implementation
// of Guava Bytes.indexOf() method
  
import com.google.common.primitives.Bytes;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        byte[] arr = { 3, 4, 5, 6, 7 };
  
        // Displaying the index for
        // first occurrence of given target
        System.out.println(Bytes.indexOf(arr, (byte)5));
    }
}

Output :

2

Example 3 :




// Java code to show implementation
// of Guava Bytes.concat() method
  
import com.google.common.primitives.Bytes;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        byte[] arr1 = { 3, 4, 5 };
        byte[] arr2 = { 6, 7 };
  
        // Using Bytes.concat() method which
        // combines arrays from specified
        // arrays into a single array
        byte[] arr = Bytes.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 Bytes.contains() method
  
import com.google.common.primitives.Bytes;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        byte[] arr = { 3, 4, 5, 6, 7 };
  
        // Using Bytes.contains() method which
        // checks if element is present in array
        // or not
        System.out.println(Bytes.contains(arr, (byte)8));
        System.out.println(Bytes.contains(arr, (byte)7));
    }
}

output :

false
true

Example 5 :




// Java code to show implementation
// of Guava Bytes.lastIndexOf() method
  
import com.google.common.primitives.Bytes;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        byte[] arr = { 3, 4, 5, 6, 7, 5, 5 };
  
        // Using Bytes.lastIndexOf() method
        // to get last occurrence of given target
        System.out.println(Bytes.lastIndexOf(arr, (byte)5));
    }
}

Output :

6

Example 6 :




// Java code to show implementation
// of Guava Bytes.lastIndexOf() method
  
import com.google.common.primitives.Bytes;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        byte[] arr = { 3, 4, 5, 6, 7, 5, 5 };
  
        // Using Bytes.lastIndexOf() method
        // to get last occurrence of given target
        // here target i.e, 9 is not present in
        // array arr, so -1 will be returned
        System.out.println(Bytes.lastIndexOf(arr, (byte)9));
    }
}

Output :

-1

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