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:
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 + " " );
}
}
} |
1 2 3 4 5
Program 2: To demonstrate ArrayIndexOutOfBoundsException.
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);
}
}
} |
Exception : java.lang.ArrayIndexOutOfBoundsException
Program 3: To demonstrate NullPointerException.
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);
}
}
} |
Exception : java.lang.NullPointerException
Program 4: To demonstrate IllegalArgumentException.
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);
}
}
} |
Exception : java.lang.IllegalArgumentException: Argument is not an array