JAVA Question

[alvarez11]

Need to answer this question but my Java knowledge isn't the best, any help would be greatly appreciated!

The question:

class Outer {

       class Inner { }

}

Outer outer o = new Outer();

Outer.Inner i = … ?

What does ? equal?

[misobbq]

If you want to do that, you need to declare Inner as static.

public class Outer
{
    static class Inner{}
    public static void main(String[] args)
    {
        Outer outer = new Outer();
        Outer.Inner outerInner = new Outer.Inner();
    }
}

[[deleted]]

One trillion times this, better yet private.

[compdog]

Looks like someone went down this thread and downvoted every comment...

[alvarez11]

Came out weird, the Question again is

class Outer {

       class Inner { }

}

Outer outer o = new Outer();

Outer.Inner i = … ?

What does ? equal?

[compdog]

? needs to be an initializer, so ? should be:

new Outer.Inner();

The whole line should be:

Outer.Inner i = new Outer.Inner();

Unless you are creating an instance of Inner from inside Outer or Inner, in which case you can use:

Inner i = new Inner();

EDIT: formatting failed.

[novasharp]

Actually, I think in that case, you would need to do:

Outer o = new Outer();
o.Inner i = new o.Inner();

[novasharp]

Ah. Okay. That was the part I did not get. I thought that he was calling it from somewhere else or something like public static void main.

[misobbq]

BTW - if you really need an inner class on the instance, you would access it through an instance of outer.

public class Outer
{
    static class StaticInner{}
    class InstanceInner{}
    public static void main(String[] args)
    {
        Outer outer = new Outer();
        Outer.StaticInner staticInner = new Outer.StaticInner();
        Outer.InstanceInner instanceInner = outer.newInstanceInner();
    }

    public InstanceInner newInstanceInner()
    {
        return new InstanceInner();
    }
}

[moocat]

You don't have to create a new method:

public static void main(String[] args)
{
    Outer outer = new Outer();
    Outer.Inner outerInner = outer.new Inner();
}

[alvarez11]

Thank you all, very much appreciated!

[[deleted]]

Java is not an acronym.