New in classes

Question

Hi
array primitive data types are crated like:
Scores= new double[10];

If we create my class and definition as array
Must this create each individual in for like?

For(int i=0; myclass.length; i++)
Myclass[i]=new myclass();

Answer 1

First, your example is not complete. Array creation involves two steps: declaration and initialization.

Declaration: you specify the type and the variable name
double[] scores;

Initialization: you specify the size of the array
scores = new double[10];

At this point, the values of a primitive array are also initialized as 0 (or in this case, 0.0 because it is double type)
And of course you can combine declare+init in a single step:
double[] scores = new double[10];

When you use classes, it is exactly the same, only the initial values of each element is null. Then, you can use a for loop to create a new instance at each array element.

Person[] people = new Person[10];

Answer 2

Hadi

Yes like this

https://code.sololearn.com/cDP6JcbNyMWU/?ref=app

Answer 3

Hi Tibor
so in primitive data is not necessary to create a new instance at each array element?
why?

Answer 4

Primitives are not objects in Java. You cannot instantiate them. They are just values. They don't have any methods. And they cannot be null - so the default value of a primitive type is 0.

Answer 5

Nice!

Answer 6

Thanks for sharing such a helpful instruction