dont let me create simple class

hi everyone , this is the code ( hole class , just for testing) :
Testit is the name of the class with the main method
Testit1 is sub-class.

The problem - in the line "Testit1 st1=new Testit1(66);" there is the following error -

Quote:

---

No enclosing instance of type Testit is accessible. Must qualify the allocation with an
enclosing instance of type Testit (e.g. x.new A() where x is an instance of Testit).

---

How to fix it? I dont quite understand even what the problem is

Code:

---

public class Testit {

        public class Testit1
        {
                public int a1;
                public boolean b1;
                public Testit1(int a)
                {
                        this.a1=a;
                        b1=false;
                }       
        };
                public static void main(String[] args) {
               
                int b=1;
                Testit1 st1=new Testit1(66);
                if (st1==null)
                        System.out.println("sorry, Testit1 is null");
                else
                        System.out.println("Testit1 exist and the int is "+st1.a1);

        }
               

}

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First of all, Testit1 is not a subclass, it's an inner class. What did you start out to do, make a subclass or make an inner class?

db

Quote:

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Testit1 is not a subclass, it's an inner class.

---

You right - my mistake

Any way, as you can see - it is not a real program. just for me to understand the how classes and arguments and references flow in methods.

so why

Quote:

---

Testit1 st1=new Testit1(66);

---

does not complie?

by the way - Testit1 in my code is inner class, makes sense.

so what is sub-class?

A subclass is one that extends a class.

Code:

---

class SuperClass {}

class SubClass extends SuperClass {}

---

Here's a good learning resource:
Lesson: Classes and Objects (The Java™ Tutorials > Learning the Java Language)

db

And, if you're prepared to devote time to understanding inner classes and enclosing instances:
Classes

Considering the present stage of your learning Java (as I perceive it) you might want to just read through that page and come back to it later. You could bookmark this:
The Java Language Specification, Third Edition - TOC

db