Java:: Converting ArrayList Primitive into Array of Number class? [duplicate]

Question

If let say i have;

ArrayList <Double> myV = new ArrayList <Double>();
myV.add(12.2); 
myV.add(3.2); 
myV.add(5.00); 

// this is error
Number[] youV = myV.toArray();

the below code is error when I compiled it. What should I do then to convert the ArrayList into Number of arrays type?

How to convert them into Number[] ? And lastly, is this code list safe for us to use, if I apply this code inside Android?

Answer 1

This code should do what you need.

Number[] result = new Number[myV.size()];
myV.toArray(result);

Answer 2

To answer your first question, You can convert them like this.

public static void main(String[] args) {

    ArrayList<Double> myV = new ArrayList<Double>();
    myV.add(12.2);
    myV.add(3.2);
    myV.add(5.00);
    Number[] target = new Number[myV.size()];
    myV.toArray(target);
    System.out.println(target[0]);
}