Array getByte() Method in Java

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:

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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 + " ");
        }
    }
}

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Output:


1 2 3 4 5





Program 2: To demostrate ArrayIndexOutOfBoundsException.











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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); 


        } 


    } 


} 



















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Output:


Exception : java.lang.ArrayIndexOutOfBoundsException





Program 3: To demonstrate NullPointerException.











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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); 


        } 


    } 


} 



















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Output:


Exception : java.lang.NullPointerException





Program 4: To demonstrate IllegalArgumentException.











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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); 


        } 


    } 


} 



















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Output:


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






          
          
          
          

            

    

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