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:

Java

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.

Java

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.

Java

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.

Java

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 getByte() Method in Java

ShivamKD

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