Array setLong() method in Java

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 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("Befor 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 + " "); 
        } 
    } 
} 

Output

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

Program 2 : To demonstrate java.lang.NullPointerException

// 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); 
        } 
    } 
} 

Output

Exception : java.lang.NullPointerException

Program 3 : To demonstrate java.lang.ArrayIndexOutOfBoundsException

// 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); 
        } 
    } 
} 

Output

Exception : java.lang.ArrayIndexOutOfBoundsException

Program 4 : To demonstrate java.lang.IllegalArgumentException.

// 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); 
        } 
    } 
} 

Output

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

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