Using Arrays from a different Class

Question

public class NewClass { 
    int[] anArray = {1,2,3,4};
}

public class NewerClass {     
    public static void main(String[] args){
        sendToMethod(NewClass.anArray);
    } 
}

Obviously how i've written it above doesn't work, i was wondering how (if possible) it could be done?

Basically i want to have a class of arrays (NewClass) and want to be able to use them with the methods from the NewerClass whilst in the main method of NewerClass.

Its not essential, I'm simply playing around with ideas.

Also you can have a look 'java encapsulation' 'java access modifiers' keywords from stackoverflow. — HRgiger
– HRgiger, Commented Nov 29, 2012 at 14:34

Rob Hruska · Accepted Answer · 2012-11-29 14:32:24Z

2

You could expose it via an accessor method:

public class NewClass {
    private int[] anArray = { 1, 2, 3, 4 };

    public int[] getAnArray() {
        return anArray;
    }
}

public class NewerClass {
    public static void main(String[] args) {
        NewClass myNewClass = new NewClass();
        sendToMethod(myNewClass.getAnArray());
    }
}

answered Nov 29, 2012 at 14:32

Rob Hruska

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4 Comments

binary101 Over a year ago

Whilst playing around, i used this: sendToMethod(NewClass.class.newInstance().anArray); and it seems to work? Your code looks nicer though...

Rob Hruska Over a year ago

The way you did it there would be a bit roundabout, and isn't much different from (new NewClass()).anArray.

durron597 Over a year ago

@qwertyRocker it's definitely better to do it the way @RobHruska describes, do not use NewClass.class.newInstance()

binary101 Over a year ago

Ok, thanks for your help :D I think i'm going to give them accessor methods, seems more sensible and easier to read.

jlordo · Accepted Answer · 2012-11-29 14:32:22Z

2

It would work if you had it like this:

public class NewClass {
    public static final int[] anArray = {1,2,3,4};
    // final is optional.
}

but I don't know what you are trying to achieve.

answered Nov 29, 2012 at 14:32

jlordo

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Comments

Peter Lawrey · Accepted Answer · 2012-11-29 14:32:54Z

1

You can do either

public class   NewClass { static int[] anArray = {1,2,3,4}; }

or

public class NewerClass { 
    public static void main(String[] args){  
        sendToMethod(new NewClass().anArray); 
    }
}

answered Nov 29, 2012 at 14:32

Peter Lawrey

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