Array setLong() method in Java
Last Updated :
10 Nov, 2022
The
java.lang.reflect.Array.setLong() is an inbuilt method in Java and is used to set a specified long value to a specified index of a given object array.
Syntax:
Array.setLong(Object []array, int index, long value)
Parameter:
- 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 long value that is to be set at the given index of the given array.
Return type: This is a void type method which doesn't returns any value. The update reflects upon the Object array passed as the argument.
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.setLong() method:
Program 1 :
Java
// Java code to demonstrate setLong() method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method
public static void main(String[] args)
{
// Declaring and defining long array
long b[] = { 1, 2, 3, 4 };
System.out.print("Before Set : ");
// printing the array
for (long x : b) {
System.out.print(x + " ");
}
long value = 10;
// setLong method of class Array
Array.setLong(b, 1, value);
System.out.print("\nAfter Set : ");
// printing array
for (Long x : b) {
System.out.print(x + " ");
}
}
}
Before Set : 1 2 3 4
After Set : 1 10 3 4
Program 2 : To demonstrate java.lang.NullPointerException
Java
// Java code to demonstrate setLong() method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method
public static void main(String[] args)
{
// Declaring and defining long array to null
long b[] = null;
try {
Array.setLong(b, 5, 10);
}
catch (Exception e) {
System.out.println("Exception : " + e);
}
}
}
Exception : java.lang.NullPointerException
Program 3 : To demonstrate java.lang.ArrayIndexOutOfBoundsException
Java
// Java code to demonstrate setLong() method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method
public static void main(String[] args)
{
// Declaring and defining long array
long b[] = { 1, 2, 3, 4 };
try {
Array.setLong(b, 5, 10);
}
catch (Exception e) {
System.out.println("Exception : " + e);
}
}
}
Exception : java.lang.ArrayIndexOutOfBoundsException
Program 4 : To demonstrate java.lang.IllegalArgumentException.
Java
// Java code to demonstrate setLong() method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method
public static void main(String[] args)
{
// Declaring and defining long variable
long b = 1;
try {
Array.setLong(b, 5, 10);
}
catch (Exception e) {
System.out.println("Exception : " + e);
}
}
}
Exception : java.lang.IllegalArgumentException: Argument is not an array