Week 3: Objects, files and exceptions/10. Array from list

Write the method

double[] newArray(ArrayList<Double> list)

which takes a list of floats as its parameter. 
The method creates and returns a floating point array with the same elements in the same order as the list.

Example method call:

public static void main(String[] args){
    ArrayList<Double> test = new ArrayList<>();
    test.add(1.0);
    test.add(3.0);
    test.add(2.75);

    double[] array = newArray(test);
    System.out.println("Array: " + Arrays.toString(array));
}

Program outputs:
Array: [1.0, 3.0, 2.75]



================


import java.util.Random;
import java.util.ArrayList;
import java.util.Arrays;

public class Test {
    public static void main(String[] args) {
        final Random random = new Random();
        
        
        double[] decimalValues = {0, 0.25, 0.5, 0.75};
        
        for (int testNumber = 1; testNumber <= 3; testNumber++) {
            System.out.println("Test " + testNumber);
            ArrayList<Double> list = new ArrayList<>();
            int size = random.nextInt(5) + 5;
            for (int i = 0; i < size; i++) {
                double element = random.nextInt(10) + decimalValues[random.nextInt(decimalValues.length)];
                list.add(element);
            }
            
            System.out.println("List: " + list);
            double[] array = newArray(list);
            System.out.println("Array: " + Arrays.toString(array));
            System.out.println("");
        }
    }



    // CONVERT LIST TO ARRAY
    public static double[] newArray(ArrayList<Double> list) {
        double[] array = new double[list.size()];
        // for (int num: list) {
        //     array[i] = num;
        // }

        // for list - need to get element using idx
        for (int i = 0; i < list.size(); i++) {
            array[i] = list.get(i);
        }
        return array;
    }


}







Test 1
List: [3.0, 6.25, 5.0, 4.75, 1.25, 8.75, 0.0, 7.0, 0.0]
Array: [3.0, 6.25, 5.0, 4.75, 1.25, 8.75, 0.0, 7.0, 0.0]

Test 2
List: [2.25, 9.75, 7.25, 2.25, 7.5, 5.25, 9.0, 8.75]
Array: [2.25, 9.75, 7.25, 2.25, 7.5, 5.25, 9.0, 8.75]

Test 3
List: [4.5, 5.75, 9.5, 5.0, 9.75]
Array: [4.5, 5.75, 9.5, 5.0, 9.75]