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Array getByte() Method in Java

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The java.lang.reflect.Array.getByte() is an inbuilt method in Java and is used to return the element present at the given index from the specified Array as a Byte.
Syntax
 

Array.getByte(Object []array, int index)

Parameters : This method accepts two mandatory parameters: 
 

  • array: The object array whose index is to be returned.
  • index: The particular index of the given array. The element at ‘index’ in the given array is returned.

Return Value: This method returns the element of the array as byte.
Exceptions: This method throws following exceptions: 
 

  • NullPointerException – when the array is null.
  • IllegalArgumentException – when the given object array is not an Array.
  • ArrayIndexOutOfBoundsException – if the given index is not in the range of the size of the array.

Below programs illustrate the get() method of Array:
Program 1: 
 

Java




import java.lang.reflect.Array;
 
public class GfG {
    // main method
    public static void main(String[] args)
    {
        // Declaring and defining a byte array
        byte a[] = { 1, 2, 3, 4, 5 };
 
        // Traversing the array
        for (int i = 0; i < 5; i++) {
 
            // Array.getByte method
            byte x = Array.getByte(a, i);
 
            // Printing the values
            System.out.print(x + " ");
        }
    }
}


Output: 

1 2 3 4 5

 

Program 2: To demonstrate ArrayIndexOutOfBoundsException.
 

Java




import java.lang.reflect.Array;
 
public class GfG {
    // main method
    public static void main(String[] args)
    {
        // Declaring and defining an int array
        int a[] = { 1, 2, 3, 4, 5 };
 
        try {
            // invalid index
            // Array.getByte method
            byte x = Array.getByte(a, 6);
 
            System.out.println(x);
        }
        catch (Exception e) {
            // throws Exception
            System.out.println("Exception : " + e);
        }
    }
}


Output: 

Exception : java.lang.ArrayIndexOutOfBoundsException

 

Program 3: To demonstrate NullPointerException.
 

Java




import java.lang.reflect.Array;
 
public class GfG {
    // main method
    public static void main(String[] args)
    {
        // Declaring an int array
        int a[];
 
        // array to null
        a = null;
 
        try {
            // null Object array
            // Array.getByte method
            byte x = Array.getByte(a, 6);
 
            System.out.println(x);
        }
        catch (Exception e) {
            // throws Exception
            System.out.println("Exception : " + e);
        }
    }
}


Output: 

Exception : java.lang.NullPointerException

 

Program 4: To demonstrate IllegalArgumentException.
 

Java




import java.lang.reflect.Array;
 
public class GfG {
    // main method
    public static void main(String[] args)
    {
        // int (Not an array)
        int y = 0;
 
        try {
            // illegalArgument
            // Array.getByte method
            byte x = Array.getByte(y, 6);
 
            System.out.println(x);
        }
        catch (Exception e) {
            // Throws exception
            System.out.println("Exception : " + e);
        }
    }
}


Output: 

Exception : java.lang.IllegalArgumentException: Argument is not an array

 



Last Updated : 22 Jun, 2021
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