declaring field variables

Hi,
I would like to declare a static final class instance, and set one of its field variables in the same line (all outside of a method). Ideally, it'd look something like this:

Code :

---

public class MyClass {
      public static final MyClass myInstance = new MyClass() { field = value };
// declaration of field & constructor for MyClass
}

---

but that doesn't work. Is this possible / does anyone have any ideas?

Put an extra pair of {}s around the assignment statement.

Alright, I was able to declare the instance, but I wasn't able to edit the fields unless I made the instance non-static. Any solution to that? I'd like to be able to call

Code :

---

MyClass.myInstance

---

in other programs.
Thanks

Please post the full text of the error message and the code that caused it.

If I have this as the declaration:

Code :

---

public final MyClass myInstance = new MyClass() {{ field = value }};

---

I get this error:

File: /.../MyOtherClass.java [line: 128]
Error: non-static variable myInstance cannot be referenced from a static context

At Line 128:

function(MyClass.myInstance);

Or, if I declare myInstance like this:

Code :

---

public static final MyClass myInstance = new MyClass() {{ field = value }};

---

I get this this error:

File: /.../MyClass.java [line: 11]
Error: non-static variable field cannot be referenced from a static context

(where line 11 is the declaration of myInstance)

Please post a small, complete program that I can compile and get these errors from.

Two lines of code can't be compiled to get the errors.

Code :

---

public class MyClass {
  private int field;
 
  public final MyClass myInstance = new MyClass()      {{ field = 3; }};
 
}

---

Code :

---

public class MyOtherProgram {
 
  public void function(MyClass mc) {
 
  }
 
  public void start() {
    function(MyClass.myInstance);
  }
 
 
  public static void main() {
    MyOtherProgram mop = new MyOtherProgram();
    mop.start();
  }
 
}

---

The start function is there so that we don't get any errors due to the fact that main is a static function, and also to better emulate the actual, complicated programs I'm trying to write.

That code compiles with no errors.

Where is the problem?

I get this error:

1 error found:
File: /.../MyOtherProgram.java [line: 8]
Error: non-static variable myInstance cannot be referenced from a static context

Whoops, I used the old version of MyClass with a static final class instance.
The following is the way to reference static variables in a class:

Code :

---

MyClass.myInstance

---

myInstance is not a static variable. You need a reference to an instance of the class.

Code :

---

aRefToClass.myInstance

---

Every instance of the MyClass class will have a myInstance variable.

What are you trying to do?

I would like it to be a static variable. If I do this:

Code :

---

public class MyClass {
  private int field;
 
  public static final MyClass myInstance = new MyClass() {{ field = 3; }};
 
}

---

I get this error instead:

1 error found:
File: /.../MyClass.java [line: 4]
Error: non-static variable field cannot be referenced from a static context

If you remove the private for field, it compiles???