trouble with making a simple construct for an array of double type

Here is my partial code:

public class Variable {


private double[] array;

public Variable(){
array[0] = 0.0;
}

public String toString(){
return array.toString();
}

public static void main(String[] args) {
Variable Var1 = new Variable();
System.out.println(Var1);
}

And I want to get the following output to simply be:
[0.0]

but for some reason there is still error. What am I doing wrong?

Quote:

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for some reason there is still error

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Please copy and paste here the full text of the error messages.

it just keeps prompting me to go to Debug mode, and does not provide a way to correct it, but i know that the error lies in
"public Variable(){
array[0] = 0.0;
}"
b/c that's where the debug first starts

Try to compile the program to get a compiler error message. Copy and paste the full text of the compiler error message here.
It's hard to suggest a fix without knowing what the problem is.

Please Edit your post and wrap your code with
[code=java]
<YOUR CODE HERE>
[/code]
to get highlighting and preserve formatting.

well, i compiled the code many times, and there were no error messages while compiling; only while running.
While running, however, it says that their is a NullPointerException on

Code java:

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<array[0] = 0.0>

---

Quote:

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NullPointerException

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Where do you assign a value to the array variable? It will have a null value if it is not assigned a value.

Here is the code again. Does this make it easier to figure out?

Code java:

---

public class Variable {
 
 
private double[] array;
 
public Variable(){
array[0] = 0.0;
}
 
public String toString(){
return array.toString();
}
 
public static void main(String[] args) {
Variable Var1 = new Variable();
System.out.println(Var1);
}

---

Where does the code assign a value to array? You need to add code that assigns a value to array.
Take a look at the tutorial:
http://docs.oracle.com/javase/tutori...ts/arrays.html

ohhhhhhhhhhhhhhhhhhhhh I see what I did. i know it was a noob mistake, but thanks!!

--- Update ---

Now how would you be able to convert an array into a string?

Please give an example of an array and the String you want to create from it.
The String class has methods that can help you.