Array getLong() Method in Java

Last Updated : 23 Jul, 2020

The java.lang.reflect.Array.getLong() is an inbuilt method in Java and is used to return an element at the given index from a specified Array as a long.

Syntax:

Array.getLong(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 long.

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 class:

Program 1:

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 }; 
  
        // Traversing the array 
        for (int i = 0; i < 5; i++) { 
  
            // Array.getLong method 
            long x = Array.getLong(a, i); 
  
            // Printing the values 
            System.out.print(x + " "); 
        } 
    } 
} 

Output:

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.getLong method 
            long x = Array.getLong(a, 6); 
  
            System.out.println(x); 
        } 
        catch (Exception e) { 
            // throws Exception 
            System.out.println("Exception : " + e); 
        } 
    } 
} 

Output:

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.getLong method 
            long x = Array.getLong(a, 6); 
  
            System.out.println(x); 
        } 
        catch (Exception e) { 
            // throws Exception 
            System.out.println("Exception : " + e); 
        } 
    } 
} 

Output:

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.getLong method 
            long x = Array.getLong(y, 6); 
  
            System.out.println(x); 
        } 
        catch (Exception e) { 
            // Throws exception 
            System.out.println("Exception : " + e); 
        } 
    } 
} 

Output:

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

Array getInt() Method in Java

ShivamKD

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