Array setByte() method in Java - GeeksforGeeks

28 Mar, 2022
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);        }    }}
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);        }    }}
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);        }    }}
Exception : java.lang.IllegalArgumentException: Argument is not an array
sumitgumber28
Java-Arrays
Java-Functions
Java-lang package
java-lang-reflect-package
java-reflection-array
Java
Java
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