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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:

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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



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