Array setByte() method in Java

Last Updated : 30 Nov, 2018

The java.lang.reflect.Array.setByte() is an inbuilt method in Java and is used to set a specified byte value to a specified index of a given object array.

Syntax:

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Array.setByte(Object []array, int index, byte value)

Parameter: This method takes 3 parameters:

array: This is an array of type Object which is to be updated.
index: This is the index of the array which is to be updated.
value: This is the byte value that is to be set at the given index of the given array.

Exception: 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 Array.setByte() method:

Program 1:

// Java code to demonstrate
// setByte() method of Array class
  
import java.lang.reflect.Array;
public class GfG {
    // main method
    public static void main(String[] args)
    {
  
        // Declaring and defining Byte array
        byte b[] = { 1, 2, 3, 4 };
  
        System.out.print("Befor Set : ");
  
        // printing the array
        for (byte x : b) {
            System.out.print(x + " ");
        }
        byte value = 10;
  
        // set method of class Array
        Array.setByte(b, 1, value);
  
        System.out.print("\nAfter Set : ");
  
        // printing array
        for (byte x : b) {
            System.out.print(x + " ");
        }
    }
}

Output:

Befor Set : 1 2 3 4 
After Set : 1 10 3 4

Program 2: To demonstrate java.lang.NullPointerException

// Java code to demonstrate
// setByte() method of Array class
  
import java.lang.reflect.Array;
public class GfG {
    // main method
    public static void main(String[] args)
    {
  
        // Declaring and defining Byte array to null
        byte b[] = null;
  
        try {
            byte s = 10;
            Array.setByte(b, 5, s);
        }
        catch (Exception e) {
            System.out.println("Exception : " + e);
        }
    }
}

Output:

Exception : java.lang.NullPointerException

Program 3: To demonstrate java.lang.ArrayIndexOutOfBoundsException

// Java code to demonstrate
// setByte() method of Array class
  
import java.lang.reflect.Array;
public class GfG {
    // main method
    public static void main(String[] args)
    {
  
        // Declaring and defining Byte array
        byte b[] = { 1, 2, 3, 4 };
  
        try {
            byte s = 10;
            Array.setByte(b, 5, s);
        }
        catch (Exception e) {
            System.out.println("Exception : " + e);
        }
    }
}

Output:

Exception : java.lang.ArrayIndexOutOfBoundsException

Program 4: To demonstrate java.lang.IllegalArgumentException

// Java code to demonstrate
// setByte() method of Array class
  
import java.lang.reflect.Array;
public class GfG {
    // main method
    public static void main(String[] args)
    {
  
        // Declaring and defining Byte variable
        byte b = 1;
  
        try {
            byte s = 10;
            Array.setByte(b, 5, s);
        }
        catch (Exception e) {
            System.out.println("Exception : " + e);
        }
    }
}

Output:

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

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Array setByte() method in Java