Why I get this error? "Non-static method change() cannot be referenced from a static context". And after I changed this metod to be static, why it gives something like this ->[I@4554617c ?

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package arraysınmethods;


public class ArraysInMethods {

    
    public static void main(String[] args) {
        int bucky[] = {3,4,5,6,7};
        change(bucky);
        for(int x:bucky)
            System.out.println(x);
    }
    public void change(int arr[]){
        for(int counter=0;counter<arr.length;counter++){
            arr[counter]+=5;
            System.out.println(arr);
        }
    }
}

What I have tried:

Why i get this error?"non-static method change() cannot be referenced from a static context".
And output is:
[I@4554617c
[I@4554617c
[I@4554617c
[I@4554617c
[I@4554617c
8
9
10
11
12

And after i changed this metod to be static,why it gives something like this ->[I@4554617c ?

Posted 7-Jul-17 1:16am

Member 12702056

Updated 7-Jul-17 1:51am

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Prifti Constantine 7-Jul-17 7:29am

Thats because on the prin youre printing out the ARRAY and probably thats the refference location of the array. In order to prin out the value of the array you also have to specify the Index of the array in order to get the value that is stored inside. System.out.println(arr[index]);

Member 12702056 7-Jul-17 7:58am

Thanks a lot,i got it :)

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OriginalGriff · Accepted Answer · 2017-07-07T01:51:00

Non-static objects - i.e. anything declared without the static keyword - are part of the "body" of a class, and only exist within an instance of that class: each time you create an new instance, you create a new version of each of the non-static objects within it.

It's like a car: when you buy a new car, it comes with it's own glove box - and you don;t expect all the stuff from your last car to magically appear within it!
The old car is one instance of the class Car, the new car is a second: and they each have separate non-static glove boxes. To access the right box, you have to spcify which instance of a Car you are looking in:

C#

Car myNewCar = new Car();
myNewCar.Glovebox.Items.ListToConsole();
Car myOldCar = myGarage.GetCar("the red one");
myNewCar.Glovebox.Items.AddRange(myOldCar.Glovebox.Items);

For static objects, you don't use an instance, you use teh class name:

C#

Console.WriteLine("A car has {0} wheels", Car.GetWheelsCount());

If you are in a static method, you can't access instance objects, because there is no instance specified for a static method - they work without any instance at all.

In your example, main is a static method - as it has to be - but change is not - it's an instance method, and requires an intance of the class to work.
Change it to this:

public static void change(int arr[]){
    for(int counter=0;counter<arr.length;counter++){
        arr[counter]+=5;
        System.out.println(arr);
    }
}

And it'll work.