Question

JAVA

Write a static method that takes an array of a generic type as its only argument.

The method should display the array and return the number of elements in the array.

Test the method in main with at least three arrays of objects.

SAMPLE OUTPUT

Here is an Integer array 12 21 7 16 8 13

That array held 6 elements

Here is a String array

one two three four

That array held 4 elements

Here is a Double array

1.1 2.2 3.3 4.4 5.5

That array held 5 elements

Answer 1

//Java code

public class GenericArrayDemo {
    public static void main(String[] args)
    {
        Integer arr[] = {12,21,7,16,8,13};
        System.out.print("Here is an Integer array ");
        int size;
        size = displayArray(arr);
        System.out.println("That array held "+size+" elements");
        //==================================
        String arr1[] = {"one","two","three","four"};
        System.out.print("Here is an String array ");
        size = displayArray(arr1);
        System.out.println("That array held "+size+" elements");
        //=====================================
        Double arr2[] = {1.1,2.2,3.3,4.4,5.5};
        System.out.print("Here is an String array ");
        size = displayArray(arr2);
        System.out.println("That array held "+size+" elements");
    }

    /**
     *  takes an array of a generic type as its only argument.
     * @param array
     * @param <T>
     * @return
     */
    private static<T> int displayArray(T[] array )
    {

        for (int i = 0; i < array.length; i++) {
            System.out.print(array[i]+" ");
        }
        System.out.println();
        return array.length;
    }
}

//Output

//If you need any help regarding this solution ............. please leave a comment .......... thanks