Array of a Class

Hi, I'm triying to fill an array of class "Months"

All I'm triying to fill is something like this: "array[position].atribute"
Every Month must have name and days; :-s

I get java.lang.NullPointerException , I don't understand why, I tryed using getter and setter but I don't fix it, I don't understand what's wrong, I don't get any compilation errors.

Thank you.

Code java:

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import java.util.Scanner;
 
public class Arrays {
	public static void main(String[] args) {
		Scanner keyboard = new Scanner(System.in);
		Months [] array = new Months[12];
 
		for(int i=0; i<array.length; i++){
			System.out.println("Introduzca el nombre del mes:\t"+(i+1));
			array[1].name = keyboard.nextLine();
			System.out.println("Introduzca los días que tiene el mes:\t");
			array[i].days = keyboard.nextInt();
		}
		keyboard.close();
		for(int i=0; i<array.length; i++){
			System.out.println(array[0].name);
			System.out.println(array[0].days);
		}
	}
}
class Months {
	String name;
	int days;
}

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Quote:

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I get java.lang.NullPointerException

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Please copy the full text of the error message and post it here. It has information about where the error happened.

Where does the code put any Months objects into the array? The array has been defined but no Months objects have been put into it so all its slots have null values.

Exception in thread "main" java.lang.NullPointerException
at Ejercicio03.main(Ejercicio03.java:26)

The name of the class is really Ejercicio03 and there is more lines but I simplified because if i fix to add a name i will know to add more attributes tt

Our posts might have crossed.

Where does the code put any Months objects into the array? The array has been defined but no Months objects have been put into it so all its slots have null values.

Sorry for my noob question, but, are you telling me that I need to instance 12 objects and full my array with these 12 objects? like this:

Code java:

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Months m = new Months();
Months[] array = new Months[12];
 
for(int i=0;i<array.length;i++)
	array[i]=m;

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But how could I loop for do 12 objects with different attributes each??

Inside the loop create a new instance with the different attributes before adding it to the array.

Your loop adds a reference to the same (one) instance of the object to all the slots of the array.

Thank you very much, now I understand it better, I did this:

Code java:

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Meses [] array = new Meses[2];
 
for(int i=0;i<array.length;i++)
	array[i]= new Meses();

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I still had problems, but the problem is now solved, I'm just blind :P I was filling the months fine, but all positions of array show me the First position.
If you check the code I always showing array[0] (12 times -.-)

Now works great.

Thank you again.