Array setByte() method in Java

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:

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

// 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("Before 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 + " ");
        }
    }
}

Program 2: To demonstrate java.lang.NullPointerException 

Java

// 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

// 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

// 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