Java: Inner class inside an inner class

Question

Please excuse me if this question has been asked before. I have searched around the web and here at stack overflow.

Case:

I am stuck at my java project and the compiler won't compile my project when I try to use an inner class inside another.

Code:

public class outer  {
    public class middle {
        public class inner  {
            public int variable = "8";
        }
    }
}

Declaration:

I am trying to declare the classes like this:

outer outerObject = new outer();
outerObject.middle middleObject = outerObject.new middle();
outerObject.middleObject.inner innerObject = outerObject.middleObject.new inner();

Compilation results:

source\start.java:8: error: cannot find symbol
                      outerObject.middleObject.inner innerObject = outerObject
.middleObject.new inner();
^

Any reply would be much appreciated! Wether my intentions are impossible or if I am simply doing something wrong.

Have a nice day!

check this link http://stackoverflow.com/questions/70324/java-inner-class-and-static-nested-class?rq=1 — , Apr 22 '13 at 12:41

Tom Hawtin - tackline · Accepted Answer · 2013-04-22T12:53:49.233

4

The line

outerObject.middleObject.inner innerObject = outerObject.middleObject.new inner();

should be

outer.middle.inner innerObject = middleObject.new inner();

outerObject does not have a middleObject field. Unfortunately Java allows statics to be qualified with variable expressions, so you get some strange code actually compiling.

This would probably be clearer if you stuck with the Java naming conventions.

edited Apr 22 '13 at 12:53

answered Apr 22 '13 at 12:39

Tom Hawtin - tackline

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Thank you! This solved my problem! I think there should be a tutorial for this. There may be some already, but I could not find any. – Ole Kristian Møller-Hansen Apr 22 '13 at 12:48
@OleKristianMøller-Hansen Specifying the outer `new` for an inner class is such an obscure and pointless feature, that I don't really think it's tutorial territory. – Tom Hawtin - tackline Apr 22 '13 at 12:56
@OleKristianMøller-Hansen maybe mark this as the answer? – Novaterata Jun 02 '17 at 03:30

score 2 · Answer 2 · answered Apr 22 '13 at 12:40

2

Your code will never compile as:

public int variable = "8";

This line should be

public int variable = 8;

First change this line.

answered Apr 22 '13 at 12:40

Shreyos Adikari

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score 0 · Answer 3 · answered Apr 22 '13 at 12:43

use this

public class outer  {
    public class middle {
        public class inner  {
            public int variable = 8;
        }
    }
    public static void main(String[] a) {
        outer outerObject = new outer();
        middle middleObject = outerObject.new middle();
        middle.inner innerObject = middleObject.new inner();
    }
}

score 0 · Answer 4 · answered Apr 22 '13 at 12:49

Please try this :

    Outer outerObject = new Outer();
    Outer.middle middleObject = outerObject.new middle();
    Outer.middle.inner innerObject = middleObject.new inner();

Also you need to change:

 public int variable = "8";

to

 public String variable = "8";

Java: Inner class inside an inner class

4 Answers4