Why cannnot derived class pointer point to a base class object?
Hi,
Pleaseeee... explain me why cannot the derived class pointer point to a base class object.
I know that Base class pointer can point to a derived class object.
Thanks & Regards,
Vig....
Example:
class Base
{ public: void foo(); } * pBase;
class Derived : public Base
{ public: void bar(); } * pDerived;
Now, what would happen if you assign pDerived = new Base() and then call pDerived->bar()?By forbidding such an assignment, compiler prevents you from writing error-prone code.
Similar Messages
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Flex/AS3 Best way to construct a derived class instance from an existing base class instance?
What is the best way to handle the instantiation of a derived class from an existing base class.
I have a base class which is being created via remote_object [RemoteClass alias] from the server. I have other specialized classes that are derived from this baseclass, but serialization with the server always happens with the base class. The base class has meta data that defines what the derived class is, for example
[RemoteClass (alias="com.myco...')]
public Class Base
public var derivedType:String;
public function Base()
public Class Derived extends Base
public "some other data"
public function Derived()
In my Cairgorm command which retrieves this object from ther server I want to do this:
public function result (event: Object):void
var baseInstance:Base = event.result;
if (baseInstance.derivedType = "derived")
var derivedInstance:Derived = new Derived( baseInstance );
What is the most efficient way of doing this? It appears to me that doing a deep-copy/clone and instantiation of the derived class is pretty inefficient as far as memory allocation and data movement via the copy.Thanks for the assistance. Let me try to clarify.
MY UI requires a number of composite classes. The individual components of the composite classes are being transfered to/from the server at different times depending upone which component has changed state. The construction of the composite classes from the base class happens in my clients business logic.
Composition happens in a derived class; but server syncronization happens using the base class. When I recieve the object from Blazeds through the remote object event, it is in the form of the base class. I then need to instantiate the derived class and copy the elements of the base class into it (for later composite construction). And likewise when sending the base class back to the server, I need to upcast the derived class to its base class. But in this case just a mere upcast does not work. I actually need to create a new base class and copy the attrbutes into it. I believe this is limitation of how remoting works on Flex/AS3.
My question is, what is the best way to turn my base class into it's derived class so further composite construction can take place. The way I am currently doing it is to create a load method on the base class, that takes the base class as on argument. The load function, copies all of the instance attribute references from the base class to the target class.
public Class Base
public function Base()
public function load(fromClass:Base)
{ // copy the references for all of the instance attributes from the fromClass to this class }
Then, after I recieve the base class from the server. I create a new derived class and pass the base class into the load function like this:
for (var i:int=0; i < event.result.length; i++) {
var derived:Derived = new Derived();
derived.load(event.result[i]);
The drawbacks of this approach is that it now requires 2 extra instance creations per object serialization. One on recieving the object from the server and one sending it to the server. I assume copying references are pretty efficient. But, there is probably some GC issues. The worst of it is in code maintenance. The load function now has to be manually maintained and kept in sync with the server class.
It would be interesting to hear how others have solved this problem. The server side is an existing application with around 2M LOC, so changing the code on the server is a non-starter.
Thanks for your help. -
Warning: Variable in inherited class hides private variable in base class?
Hello,
I've come across a simple case like this:
class A {
private:
int varA;
class B : public A {
B() {
int varA = 5; // does it hide A::varA ?!
};which is causing my Studio 11/12 compiler front ends to issue a warning like:
"..., line 8: Warning: varA hides A::varA."
when I try to compile with default settings.
I'm aware that this warning can be easily worked around, but I'm still wondering what the standard says about this?
Does B::varA really hide A::varA even though it is declared private?!
Looks like a small bug to me.
Can someone please try my example with the latest and greatest Studio compiler?
Thanks,
Jochen
Compiler details:
# /usr/sunstudio12.1/bin/version
Machine hardware: i86pc
OS version: 5.10
Processor type: i386
Hardware: i86pc
The following components are installed on your system:
Sun Studio 12 update 1
Sun Studio 12 update 1 C Compiler
Sun Studio 12 update 1 C++ Compiler
Sun Studio 12 update 1 Tools.h++ 7.1
Sun Studio 12 update 1 C++ Standard 64-bit Class Library
Sun Studio 12 update 1 Garbage Collector
Sun Studio 12 update 1 Debugging Tools (including dbx)
Sun Studio 12 update 1 IDE
Sun Studio 12 update 1 Performance Analyzer (including collect, ...)
Sun Studio 12 update 1 Performance Library
Sun Studio 12 update 1 Scalapack
Sun Studio 12 update 1 LockLint
Sun Studio 12 update 1 Building Software (including dmake)
Sun Studio 12 update 1 Documentation Set
version of "/usr/sunstudio12.1/bin/../prod/bin/../../bin/cc": Sun C 5.10 SunOS_i386 Patch 142363-03 2009/12/03
version of "/usr/sunstudio12.1/bin/../prod/bin/../../bin/CC": Sun C++ 5.10 SunOS_i386 128229-04 2009/11/25
version of "/usr/sunstudio12.1/bin/../prod/bin/../../bin/dbx": Sun DBX Debugger 7.7 SunOS_i386 2009/06/03
version of "/usr/sunstudio12.1/bin/../prod/bin/../../bin/analyzer": Sun Analyzer 7.7 SunOS_i386 2009/06/03
version of "/usr/sunstudio12.1/bin/../prod/bin/../../bin/dmake": Sun Distributed Make 7.9 SunOS_i386 2009/06/03jroemmler wrote:
Steve_Clamage wrote:
Accessibility versus visibility is part of the standard. [...]Ok, If that's the case, then the warning is caused by design and not by Studio C++.Yes, sort of.
>
I assume that other compilers do not complain because they do not strictly adhere to the standard and perform additional accessibility checks before complaining about a name clash...No. Hiding a name is legal, and your code example has well-defined behavior. There is no issue that a compiler is required to complain about. (That is, no language rule is violated.)
If name hiding results in an invalid program, the error is due to the effects of hiding the name, not the hiding itself. Having a warning about the name hiding would help you find the reason for the error in that case.
The C++ standard requires a "diagnostic message" for most violations of rules. Compilers generally treat these violations as fatal errors. The standard does not require or forbid any other kind of diagnostic message. That leaves compiler implementers free to emit, or omit, any warnings they think will best serve their customers.
Compilers vary in what sorts of warnings (non-fatal observations) they emit. Most compilers, including Studio C++, provide ways to control the kinds of warnings you see. Compilers that don't warn by default about name hiding might provide a warning if you ask for it. For example, Studio C++ offers these options to control warnings:
-w Do not emit any warnings
+w Emit additional warnings
+w2 Emit still more warnings about picky portability issues
-errtags Emit a tag with warnings for use with -erroff and -errwarn
-erroff=... Do not issue the listed warnings
-errwarn=... Treat the listed warnings as errors
-xwe Treat all warnings as errors
You can read more about these options in the C++ Users Guide. -
Error with instance variable and constructor of base class
I am getting the error on the following statement "protected Point apoint" of by base class. What is causing this problem? See my code:
package Shapes;
public abstract class Shapes
protected Point apoint; / ****error at this line****/
public void move(double xdelta, double ydelta)
apoint.x += xdelta;
apoint.y += ydelta;
public abstract void distance();
public abstract void show();
public String toString()
return "\nThe starting point is at coordinates ("+x+","+y+")";
package Shapes;
public class Lines extends Shapes
protected Point start;
protected Point end;
protected double x;
protected double y;
double delta;
public Lines( final Point apoint, final Point bpoint)
start.x = apoint.x;
start.y = apoint.y;
end.x = bpoint.x;
end.y = bpoint.y;
public Lines(double xstart, double ystart, double xend, double yend)
this.xstart = xstart;
this.ystart = ystart;
this.xend = xend;
this.yend = yend;
public Lines(double x, double y)
this.x = x;
this.y = y;
public void distance(final Lines start, final Lines end)
delta = abs(Math.sqrt (super.x - start.x) * (super.x - end.x) +
(super.y - start.y) * (super.y - end.y));
Lines move(Point start, double delta)
end.x += delta;
end.y += delta;
return new Point(end);
public Lines show()
g.drawLine( start.x, start.y, end.x, end.y);
public String toString()
return super.toString()+ "\n moved distance is("
+ start + ") : (" + end + ")"
+" \n to position(" + start + " ) : (" + end + ")";
package Shapes;
public class Rectangle extends Lines
double delta;
public Rectangle (Point top_lft_pt, Point bottom_rght_pt)
super(top_lft_pt, bottom_rght_pt);
public Rectangle(double x_top_lft, double y_top_lft, double x_bottom_rght, double y_bottom_rght)
super(x_top_lft, y_top_lft, x_bottom_rght, y_bottom_rght);
public Rectantgle is_it_diagonal()
if(top_lft.x > bottom_rght.x && bottom_rght.x < top_lft.x)
System.out.println("Point are Not Diagonal");
public void distance(double delta)
delta = abs(Math.sqrt (top_lft.x - bottom_rght.x) * (top_lft.x - botton_rght.x) +
(top_lft.y - bottom_rght.y) * (top_lft.y - bottom_rght.y));
public Rectangle move(final Point top_lft_pt, double delta)
bottom_rght.x += delta;
bottom_rght.y += delta;
return new Point(bottom_rght_pt);
public void get_top_rght_coords()
Point top_rght = new Point();
top_rght.x = bottom_rght.x;
top_rght.y = top_lft.y;
public void get_bottom_left_coords()
Point bottom_lft = new Point();
bottom_lft.x = top_lft.x;
bottom_lft.y = bottom_rght.y;
public Rectangle show()
g.drawLine(top_lft.x, top_lft.y, top_rght_x, top_rght_y);
g.drawLine(bottom_lft.x, bottom_lft.y, bottom_rght.x, bottom_rght.y);
g.drawLine(top_lft.x, top_lft.y, bottom_lft.x, bottom_lft.y);
g.drawLine(top_rght.x, top_rght.y, bottom_rght.x, bottom_rght.y);
package Shapes;
public class Circles extends Lines
protected double radius;
public double delta;
protected Point center;
public Circles(double x, double y, double radians)
super(x, y);
radius = radians;
public Circles(Point acenter)
center.x = acenter.x;
center.y = acenter.y;
public void distance()
delta = abs(Math.sqrt(super.x - x) * (super.x - x) + (super.y - y) * (super.y -y));
public Circles move(final Point Circles, double delta)
return new Point(Circles);
public void show()
g.drawOval(Circles.x, Circles.y, radius, radius);
package Shapes;
import java .math .*;
import java.util .Random ;
public class ShapesDriver
Shapes[] aShape = new Shapes[10];
static double range = 101.0;
static Random r1 = new Random();
public static void main(String [] args)
double[][] coords = new double[10][10];
double[] radians = new double [10];
Shapes anyShape = {
new Circles(radians),
new Lines(coords),
new Rectangle(coords)
Shapes aShape; /***error at this line***/
for(int i = 1; i <= coords.length; i++)
for(int j = 1; j <= coords.length; j++)
coords[i][j] = r1.nextDouble () * range;
radians[j] = r1.nextDouble () * range;
aShape[i] = anyShape[r1.nextInt(aShape.length)];
System.exit(1);Thanks for your help with this problem. Now I have another problem that I am having a hard time figuring out. My program is using inheritance and polymorphism. I trying to use only one version of methods in the superclass points which extends the shapes class which is the abstract superclass vs. repeating the implementation of the methods (move, show, etc.) in each of the subclasses. The error I am getting is this "declare the class abstract, or implement abstract member 'Point Shapes.move()'. As you see, move is declared abstract and of type point in the Shapes superclass and it's behavior is implemented in the subclass Points extending Shapes. The other subclasses, circle, rectangle and lines will invoke the move method from Points and return a new point object. Why I am I getting the error to declare or implement move when the implementation is in Point?
Below is code, please help?
import java .awt .Point ;
public class ShapesDriver
public static void main(String args[])
int count = 0;
int choice;
Point start = null;
Point end = null;
System.out .println(" 1 i am here");
start = new Point((int)(Math.random()* 10.0), (int)(Math.random()* 10.0));
end = new Point((int)(Math.random()* 10.0), (int)(Math.random()* 10.0));
System.out .println(" 2 i am here");
System.out.println (start);
System.out.println(end);
for(int i = 0; i <= count; i++)
System.out .println(" 3 i am here");
choice = (int)(4.0 * Math.random());
System.out .println(" 4 i am here");
System.out.println (choice);
switch(choice)
case 0: //Lines
System.out .println(" 5 i am here");
Lines apoint = new Lines((int)(Math.random()* 10.0), (int)(Math.random()* 10.0),
(int)(Math.random()* 10.0), (int)(Math.random()* 10.0));
Point coords = new Point((int)(Math.random()* 10.0),
(int)(Math.random()* 10.0));
new Point((int)(Math.random()* 10.0),
(int)(Math.random()* 10.0));
break;
case 1: //Circles
System.out .println(" 6 i am here");
Circles center = new Circles((double)(Math.random()* 10.0),
(double)(Math.random()* 10.0), (double)(Math.random()* 10.0),
(double)(Math.random()* 10.0),(double)(Math.random()* 10.0));
Circles centerpt = new Circles((int)(Math.random()* 10.0),
(int)(Math.random()* 10.0), (int)(Math.random()* 10.0),
(int)(Math.random()* 10.0), (double)(Math.random()* 10.0));
break;
case 2: //Rectangles
System.out .println(" 7 i am here");
Rectangle top_lft_pt = new Rectangle ((double)(Math.random()* 10.0),
(double)(Math.random()* 10.0), (double)(Math.random()* 10.0),
(double)(Math.random()* 10.0), (double)(Math.random()* 10.0),
(double)(Math.random()* 10.0));
Rectangle bottom_rgt_pt = new Rectangle ((double)(Math.random()* 10.0),
(double)(Math.random()* 10.0), (int)(Math.random()* 10.0),
(int)(Math.random()* 10.0), (int)(Math.random()* 10.0),
(int)(Math.random()* 10.0));
break;
default:
System.out .println(" 9 i am here");
System.out.println("\nInvalid shape choice =" + choice);
System.exit(0);
break;
try
System.in.read();
catch(java.io.IOException ioe)
import java .awt .Point ;
public abstract class Shapes
private String shape;
public Shapes(String ashape)
shape = new String(ashape);
public abstract Point move();
public double distance()
return 0.0;
public abstract void show();
public String toString()
return "\nThis shape is a" + shape;
import java .awt .Point ;
public class Rectangle extends Points
protected Point top_lft;
protected Point top_rgt;
protected Point bottom_lft;
protected double top_lft_x;
protected double top_lft_y;
protected double bottom_rgt_x;
protected double bottom_rgt_y;
protected Point bottom_rgt;
protected double delta = 0;
protected String shape = "Rectangle";
public Rectangle(double x, double y, double top_lft_x,
double top_lft_y, double bottom_rgt_x,
double bottom_rgt_y)
super(x, y);
top_lft_x = top_lft_x;
top_lft_y = top_lft_y;
bottom_rgt_x = bottom_rgt_x;
bottom_rgt_y = bottom_rgt_y;
public Rectangle( double x, double y, Point bottom_rgt, Point top_lft)
super(x, y);
bottom_rgt_x = bottom_rgt.x;
bottom_rgt_y = bottom_rgt.y;
top_lft_x = top_lft.x;
top_lft_y = top_lft.y;
public String toString()
return super.toString() + " coordinates top left= " + top_lft_x + "," + top_lft_y + "and bottom right" +
bottom_rgt_x + "," + bottom_rgt_y + ")";
public void is_it_diagonal()
if(top_lft_x < bottom_rgt_x && bottom_rgt_x > top_lft_x)
System.out.println("Points are Not Diagonal");
public double distance()
distance ();
return delta;
public Point move(Point top_lft)
move();
bottom_rgt_x += delta;
bottom_rgt_y += delta;
return top_lft;
public void get_other_coords()
top_rgt.x = bottom_rgt.x;
top_rgt.y = top_lft.y;
bottom_lft.x = top_lft.x;
bottom_lft.y = bottom_rgt.y;
public void show()
super.show();
System.out.println("new coords are :");
System.out .println ("(" + top_lft_x + "," + top_lft_y + ")");
System.out .println ("top right(" + top_rgt + ")");
System.out .println ("(" + bottom_rgt_x + "," + bottom_rgt_y + ")");
System.out .println ("bottom right(" + bottom_rgt + ")");
import java .awt .Point ;
public class Points extends Shapes
protected double delta = 0.0;
protected double x;
protected double y;
protected String ashape = "Points";
public Points( double x, double y)
super("Points");
x = x;
y = y;
public Points( Point start)
super("Points");
x = start.x;
y = start.y;
public String toString()
return super.toString() + "References coordinates(" + x + y + ")";
public double distance(double x1, double y1 )
return delta =(Math.sqrt(x - x1) * (x - x1) + (y - y1) *
(y - y1));
public Point move(Point pts)
pts.x += delta;
pts.y += delta;
return pts;
public void show()
System.out.println("This shape is a" + ashape + "(" +
"(" + x+ "," + y + ")");
import java .awt .Point ;
public class Lines extends Points
double delta = 0;
protected double x;
protected double y;
protected String ashape = "Lines";
public Lines( double x1, double y1, double x, double y)
super(x1,y1);
x = x;
y = y;
public Lines(Point start, Point end)
super(start);
x = end.x;
y = end.y;
public String toString(Point end)
return super.toString() + "line points = (" + x + "," + y +
"(" + end + ")";
public double distance()
distance ();
return delta;
public Point move(Point lines)
move ();
return lines;
public void show()
System.out.println("This shape is a" + ashape + "(" +
"(" + x + "," + y + ")");
import java .awt .Point ;
public class Circles extends Points
protected double radius;
protected double xcenter;
protected double ycenter;
protected String ashape = "Circle";
public Circles( double x, double y, double cx, double cy, double radians)
super(x, y);
xcenter = cx;
ycenter = cy;
radius = radians;
public Circles( Point acenter, Point ref, double radians)
super(ref);
xcenter = acenter.x;
ycenter = acenter.y;
radius = radians;
public String toString(Point ref)
return super.toString() + " reference points (" +
ref + ")" +
"center coordinates (" + xcenter + "," + ycenter + ")";
public double distance(Point ref)
return (Math.sqrt(ref.x - xcenter) * (ref.x - xcenter)
+ (ref.y - ycenter) *
(ref.y - ycenter));
public Point move(Point center)
move();
return center;
public void show()
System.out.println("This shape is a" + ashape + "(" +
"(" + xcenter + "," + ycenter + ")"); -
How to call a method of a base class if the base class is abstract...
This is my sample code>>>>
abstract class b {
public void display() {
System.out.println("I am in Base Class");
class test extends b {
public static void main(String[] args) {
test obj = new test();
obj.display();
public void display() {
System.out.println("I am in Derived Class");
I want to call base class version of display with derived class object.........is it possible....* headdesk *
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* headdesk *
Enough with the friggin' zombie threads already! -
Where to put methods in a abstract base class - subclasses system
Hi,
I’d like to ask a question on some basic design practice.
When there are methods which are common in some subclasses so I would like to “move them up” in the base abstract class, I would also like to make sure that the ADT concept of the base class itself is not broken. So I don’t want to have methods in the base class that are not general enough to be there. How to resolve this?
For example I create a base abstract class Vehicle. Then I create subclasses Plane and Tanker and realize that the startEnginge() method in them is the same and in order remove the duplicated code, I can put it in Vehicle. But later there may be Bicycle or Sled subclasses which don’t need startEngine().
In a broader sense, I would like to keep the Vehicle class as similar to the real word concept of vehicles as possible. And not evey vehicle have engine of course.
What is the solution?
Extending the class hierarchy by injecting another abstract class between the base and the subclasses? (e.g: VehicleWithEngine)
I suppose I can’t use Interfaces because I need to have the common implemenations as well.
Thanks for any comments in advance,
lemonboston
ps: I am a beginner and don't know the terminology, so if there are programming expression for the followings for example, I would be thankful if someone could help with this too:
- moving common methods up in the class hierarchy
- injecting a class in the hierarchy
- abstract base class - subclasses systemlemonboston wrote:
Hi,
I’d like to ask a question on some basic design practice.
When there are methods which are common in some subclasses so I would like to “move them up” in the base abstract class, I would also like to make sure that the ADT concept of the base class itself is not broken. So I don’t want to have methods in the base class that are not general enough to be there. How to resolve this?
You are talking about code.
Instead you need to talk about the design.
The base class represents conceptually a 'type' of something. That 'type' defines behavior. That behavior is what goes in the base class nothing else (in terms of design.)
If you have common functionality which does not fit into the definition (design) of the 'type' then you put it in another class and use (composition) that class in the sub class.
For example I create a base abstract class Vehicle. Then I create subclasses Plane and Tanker and realize that the startEnginge() method in them is the same and in order remove the duplicated code, I can put it in Vehicle. But later there may be Bicycle or Sled subclasses which don’t need startEngine(). No that is not how it works.
You have specific examples of some vehicles and then you need to manage those types generically. That is the first step.
Second step is then to determine what the exact 'type' is that you want to manage. And you use the requirements of the need to create the 'type'.
Then you look at the specific examples to determine how they will meet the needs of the type.
Thus if I have an application that must start the engines of all the vehicles in the city then I must have a vehicle class which has startEngine.
But if I have an application that manages vehicles as inventory (like a retail store) and then decide that because my examples both have engines that I might as well move it into the base class. In that case there is no 'need' for the application to manage starting vehicles. The fact that both have engines is irrelevant.
So looking back at your example you have stated functionality about your specific types but you have not stated anything about why your application needs to deal with that functionality generically.
Another way to think about it is that you do not put the shared functionality in the base because you can but rather because you must. -
Class override, how to create the child class and then the base class
I started to write a program for a smart DMM, the problem is every version of the DMM the company change the communication commend.
My idea is to write a child class for every DMM version and every SubVI of the child will override the base class SubVI.
My problem is, i want first to create one child class and after i will see every thing is work, start to create the base class. that way i will see if am thinking the right way.
My question is
How can i create a child class and then create the base class and configure the SubVi of the child class to be Override of the base class?
I tried to search in the property of the class but i didn't see nothing.
Thanks
Solved!
Go to Solution.This can be done and I've done it on occasion.
You simply create the base class with the dynamic dispatch methods you require (connector panes need to be identical to thos of the child class).
Then set the inheritance of the class to inherit from this base class. If your method is defined as a dynamic dispatch method in the parent, you'll most likely now have some errors (unless your child method was already DD in which case you might just be OK already).
To change the inheritance of a class, right-click the properties of the class in your project and select properties. I believe the ineritance tree is at the lower end of the properties. Click on the "change inheritance" (or something similar) to choose the class from which you now wish to inherit.
Say hello to my little friend.
RFC 2323 FHE-Compliant -
Determine LVOOP class name? - of a child class...
Hi,
I have a number of modules (classes) that inherit from a base class called "Module". I have these all in an array of type "Module", I would like to log some information from each of these modules, but I need to distinguish between each module.
Is there a way to determine the class name from the data wire?
I can use varient to flattened string, but I was just wondering if there was a built in property node/function for this?
Thanks,
Jonathan
Examples Attached:
Message Edited by malkier on 03-20-2009 12:39 PM
LV 8.2/8.5/8.6 - WinXP
Solved!
Go to Solution.
Attachments:
Use_Module_BD.png 4 KB
Modname_BD.png 4 KB
ArrayResults_FP.png 3 KBmalkier,
There is no build in function that does exactly what you are looking for, but you can use the 'Get LV Class Path' VI to return the *.lvclass path of a given object. Using this path, you can either parse out the name, or you can use VI server to get the name of the class, as shown in the attached image.
Chris M
Attachments:
GetClassName.png 4 KB -
BUG? Default Project Properties, Business Components: Base Classes
Is it just me, or is there a bug in the Default Project Properties Dialog when attemptiong to specify custom classes for the Business Component Base Classes.
I have extended EntityCache and can successfully specify it as a base class via the Project Properties dialog, but in Default Project Properties, I get an error stating: "The selected class is not a valid superclass. Either is does not implement the interface oracle.jbo.server.EntityCache or it has an invalid modifier".
FYI: My custom library has been added to the Default Project Properties->Libraries.
Any help?Does it work if you use the:
Tools | Preferences... | Business Components > Base Classes panel instead? -
I frequently create a lot of Library Symbols, export for Actionscript, letting Flash auto-generate the Class & extending a custom base-class in order to give them all custom functionality w/out having to create a Class for each, and/or without having to create a FactoryClass for instantiating X number of ClassObjects for each Symbol to be added to.
It's really fast for prototyping, and with this workflow I've only hit a few obstacles. Those are:
1 - If the Symbol has children you cannot give the children instance-names, else the compiler gives an error related to automatically declaring stage instances. Two workarounds for this are that you can uncheck automatically declare stage instances, and do it manually in your base-class. or you can avoid using instance-names, and use getChildAt().
2 - If the Symbol is a MovieClip, the timeline doesn't inherit the base-classes imports. I don't have a workaround for this.
My question is, are these limitations that could be addressed by Adobe's Flash team, or are they limitations that are unavoidable without altering the workflow?Vote for this idea at ideas.adobe.com Flash Professional: http://tinyurl.com/2bxew2x
Problem Description:
Using the Library to export Symbols for Actionscript hits a severe wall when Symbols use auto-generated classes + base-classes. Child instances are declared as their auto-generated class type instead of their base-class. The result is that you cannot create 2 Library Symbols with auto-generated classes which inherit from a user-defined base-class which have named child instances with auto-generated classes & a user-defined base-class.
Steps to Reproduce:
1. Create 2 Library Symbols, export for Actionscript with base-class "Character" which extends Sprite. Let Flash auto-generate Class names "Character1" & "Character2".
2. Create 2 more Library Symbols, export for Actionscript with base-class "Head" which extends Sprite. Let Flash auto-generate Class names "Character1Head" & "Character2Head".
3. Place an instance of Character1 on the stage, and give it a child instance of "Character1Head" named "head".
4. Place an instance of Character2 on the stage, and give it a child instance of "Character2Head" named "head".
5. Test Movie or Publish
Actual Result:
Warning: All instances named 'head' will be automatically declared as "Character1Head" in symbols that use "Character" as their base class. In symbols that are linked to user-defined base classes, instances with the same name must be of the same type.
Expected Result:
Flash should declare all instances named "head" as their base-class type "Head" when using auto-generated Classes. Save this workflow!!! -
Why am I receiving Null pointer Exception Error.
why am I receiving Null pointer Exception Error.
Hi I am developing a code for login screen. There is no syntex error as such ut I am receving the aove mentioned error. Can some one please help me ??
------------ Main.java------------------
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
public class Main implements ActionListener
Frame mainf;
MenuBar mb;
MenuItem List,admitform,inquiry,exit,helpn;
Menu newm,update,help;
Inquiry iq;
Admit ad;
// HosHelp hp;
Howuse hu;
Register reg;
Main()
mainf=new Frame(" Engg College V/S Mumbai University ");
mb=new MenuBar();
newm=new Menu(" New ");
update=new Menu(" Update ");
help=new Menu(" Help ");
List=new MenuItem("List");
admitform=new MenuItem("Admit");
inquiry=new MenuItem("Inquiry");
exit=new MenuItem("Exit");
helpn=new MenuItem("How to Use?");
newm.add(List);
newm.add(admitform);
newm.add(inquiry);
newm.add(exit);
help.add(helpn);
mb.add(newm);
mb.add(update);
mb.add(help);
mainf.setMenuBar(mb);
exit.addActionListener(this);
List.addActionListener(this);
inquiry.addActionListener(this);
admitform.addActionListener(this);
helpn.addActionListener(this);
mainf.setSize(400,300);
mainf.setVisible(true);
public void actionPerformed(ActionEvent ae)
if (ae.getSource()==List)
reg=new Register();
if(ae.getSource()==inquiry)
iq=new Inquiry();
if(ae.getSource()==admitform)
ad=new Admit();
if(ae.getSource()==helpn)
hu=new Howuse();
if(ae.getSource()==exit)
mainf.setVisible(false);
public static void main(String args[])
new Main();
-------------Register.java---------------------------
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
public class Register implements ActionListener//,ItemListener
Label id,name,login,pass,repass;
Button ok,newu,cancel,check;
Button vok,iok,lok,mok,sok; //buttons for dialog boxes
TextField idf,namef,loginf,passf,repassf;
Dialog valid,invlog,less,mismat,acucreat;
Frame regis;
Checkbox admin,limit;
CheckboxGroup type;
DBconnect db;
Register()
db=new DBconnect();
regis=new Frame("Registeration Form");
type=new CheckboxGroup();
admin=new Checkbox("Administrator",type,true);
limit=new Checkbox("Limited",type,false);
id=new Label("ID :");
name=new Label("Name :");
login=new Label("Login :");
pass=new Label("Password :");
repass=new Label("Retype :");
idf =new TextField(20); idf.setEnabled(false);
namef=new TextField(30); namef.setEnabled(false);
loginf=new TextField(30); loginf.setEnabled(false);
passf=new TextField(30); passf.setEnabled(false);
repassf=new TextField(30); repassf.setEnabled(false);
ok=new Button("OK"); ok.setEnabled(false);
newu=new Button("NEW");
cancel=new Button("Cancel");
check=new Button("Check Login"); check.setEnabled(false);
vok=new Button("OK");
iok=new Button("OK");
lok=new Button("OK");
mok=new Button("OK");
sok=new Button("OK");
valid=new Dialog(regis,"Login name is valid !");
invlog=new Dialog(regis,"Login name already exist!");
less=new Dialog(regis,"Password is less than six characters !");
mismat=new Dialog(regis,"password & retyped are not matching !");
acucreat=new Dialog(regis,"You have registered successfully !");
regis.setLayout(null);
// regis.setBackground(Color.orange);
valid.setLayout(new FlowLayout());
invlog.setLayout(new FlowLayout());
less.setLayout(new FlowLayout());
mismat.setLayout(new FlowLayout());
acucreat.setLayout(new FlowLayout());
id.setBounds(35,50,80,25); //(left,top,width,hight)
idf.setBounds(125,50,40,25);
name.setBounds(35,85,70,25);
namef.setBounds(125,85,150,25);
login.setBounds(35,120,80,25);
loginf.setBounds(125,120,80,25);
check.setBounds(215,120,85,25);
pass.setBounds(35,155,80,25);
passf.setBounds(125,155,80,25);
repass.setBounds(35,190,80,25);
repassf.setBounds(125,190,80,25);
admin.setBounds(35,225,100,25);
limit.setBounds(145,225,100,25);
ok.setBounds(45,265,70,25);
newu.setBounds(135,265,70,25);
cancel.setBounds(225,265,70,25);
passf.setEchoChar('*');
repassf.setEchoChar('*');
regis.add(id);
regis.add(idf);
regis.add(name);
regis.add(namef);
regis.add(login);
regis.add(loginf);
regis.add(check);
regis.add(pass);
regis.add(passf);
regis.add(repass);
regis.add(repassf);
regis.add(ok);
regis.add(newu);
regis.add(cancel);
regis.add(admin);
regis.add(limit);
valid.add(vok);
invlog.add(iok);
less.add(lok);
mismat.add(mok);
acucreat.add(sok);
ok.addActionListener(this);
newu.addActionListener(this);
check.addActionListener(this);
cancel.addActionListener(this);
// limit.addItemListener(this);
//admin.addItemListener(this);
vok.addActionListener(this);
iok.addActionListener(this);
lok.addActionListener(this);
mok.addActionListener(this);
sok.addActionListener(this);
regis.setLocation(250,150);
regis.setSize(310,300);
regis.setVisible(true);
public void actionPerformed(ActionEvent ae)
if(ae.getSource()==check)
try{
String s2=loginf.getText();
ResultSet rs=db.s.executeQuery("select* from List");
while(rs.next())
if(s2.equals(rs.getString(2).trim()))
// invlog.setBackground(Color.orange);
invlog.setLocation(250,150);
invlog.setSize(300,100);
cancel.setEnabled(false);
ok.setEnabled(false);
check.setEnabled(false);
invlog.setVisible(true);
break;
else
// valid.setBackground(Color.orange);
valid.setLocation(250,150);
valid.setSize(300,100);
cancel.setEnabled(false);
ok.setEnabled(false);
check.setEnabled(false);
valid.setVisible(true);
}catch(Exception e)
e.printStackTrace();
if(ae.getSource()==newu)
try{
ResultSet rs=db.s.executeQuery("select max(ID) from List");
while(rs.next())
String s1=rs.getString(1).trim();
int i=Integer.parseInt(s1);
i++;
String s2=""+i;
idf.setText(s2);
newu.setEnabled(false);
namef.setText(""); namef.setEnabled(true);
loginf.setText(""); loginf.setEnabled(true);
passf.setText(""); passf.setEnabled(true);
repassf.setText(""); repassf.setEnabled(true);
ok.setEnabled(true);
check.setEnabled(true);
}catch(Exception e)
e.printStackTrace();
if(ae.getSource()==ok)
try
String s1=idf.getText();
String s2=loginf.getText();
String s3=passf.getText();
String s4=repassf.getText();
int x=Integer.parseInt(s1);
int t;
if(type.getSelectedCheckbox()==admin)
t=1;
else
t=0;
ResultSet rs=db.s1.executeQuery("select* from List");
while(rs.next())
if(s2.equals(rs.getString(2).trim()))
invlog.setBackground(Color.orange);
invlog.setLocation(250,150);
invlog.setSize(300,100);
cancel.setEnabled(false);
ok.setEnabled(false);
check.setEnabled(false);
invlog.setVisible(true);
break;
else
if (s3.length()<6)
less.setBackground(Color.orange);
less.setLocation(250,150);
less.setSize(300,100);
ok.setEnabled(false);
cancel.setEnabled(false);
check.setEnabled(false);
less.setVisible(true);
else if(!(s3.equals(s4)))
mismat.setBackground(Color.orange);
mismat.setLocation(250,150);
mismat.setSize(300,100);
ok.setEnabled(false);
cancel.setEnabled(false);
check.setEnabled(false);
mismat.setVisible(true);
else
db.s1.execute("insert into User values("+x+",'"+s2+"','"+s3+"',"+t+")");
acucreat.setBackground(Color.orange);
acucreat.setLocation(250,150);
acucreat.setSize(300,100);
regis.setVisible(false);
acucreat.setVisible(true);
}//else
}//while
} //try
catch(Exception e1)
// e1.printStackTrace();
if (ae.getSource()==cancel)
regis.setVisible(false);
if (ae.getSource()==vok)
ok.setEnabled(true);
cancel.setEnabled(true);
check.setEnabled(true);
valid.setVisible(false);
if (ae.getSource()==iok)
ok.setEnabled(true);
cancel.setEnabled(true);
check.setEnabled(true);
invlog.setVisible(false);
if (ae.getSource()==lok)
less.setVisible(false);
cancel.setEnabled(true);
ok.setEnabled(true);
check.setEnabled(true);
if (ae.getSource()==mok)
mismat.setVisible(false);
cancel.setEnabled(true);
ok.setEnabled(true);
check.setEnabled(true);
if (ae.getSource()==sok)
acucreat.setVisible(false);
ok.setEnabled(false);
newu.setEnabled(true);
regis.setVisible(true);
public static void main(String args[])
new Register();
-----------DBConnect.java------------------------------------
import java.sql.*;
public class DBconnect
Statement s,s1;
Connection c;
public DBconnect()
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
c=DriverManager.getConnection("jdbc:odbc:Sonal");
s=c.createStatement();
s1=c.createStatement();
catch(Exception e)
e.printStackTrace();
----------Login.java----------------
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
public class Login implements ActionListener
Frame log;
Label login,pass;
TextField loginf,passf;
Button ok,cancel;
Dialog invalid;
Button iok;
Register reg;
DBconnect db;
Main m;
Login()
db=new DBconnect();
log=new Frame();
log.setLocation(250,210);
login=new Label("Login :");
pass=new Label("Password :");
loginf=new TextField(20);
passf=new TextField(20);
passf.setEchoChar('*');
ok=new Button("OK");
// newu=new Button("New User");
cancel=new Button("CANCEL");
iok=new Button(" OK ");
invalid=new Dialog(log,"Invalid User!");
//log.setBackground(Color.cyan);
//log.setForeground(Color.black);
log.setLayout(null);
// iok.setBackground(Color.gray);
invalid.setLayout(new FlowLayout());
login.setBounds(35,50,70,25); //(left,top,width,hight)
loginf.setBounds(105,50,100,25);
pass.setBounds(35,85,70,25);
passf.setBounds(105,85,70,25);
ok.setBounds(55,130,70,25);
// newu.setBounds(85,120,80,25);
cancel.setBounds(145,130,70,25);
log.add(login);
log.add(loginf);
log.add(pass);
log.add(passf);
log.add(ok);
// log.add(newu);
log.add(cancel);
invalid.add(iok);//,BorderLayout.CENTER);
ok.addActionListener(this);
// newu.addActionListener(this);
cancel.addActionListener(this);
iok.addActionListener(this);
log.setSize(300,170);
log.setVisible(true);
public void actionPerformed(ActionEvent a)
if(a.getSource()==ok)
try{
String l=loginf.getText();
String p=passf.getText();
ResultSet rs=db.s.executeQuery("select * from List");
while(rs.next())
if(l.equals(rs.getString(2).trim())&& p.equals(rs.getString(3).trim()))
String tp=rs.getString(4).trim();
int tp1=Integer.parseInt(tp);
log.setVisible(false);
if(tp1==1)
m=new Main();
// m.List.setEnabled(true);
else
m=new Main();
m.List.setEnabled(false);
break;
else
invalid.setBackground(Color.orange);
invalid.setSize(300,100);
invalid.setLocation(250,210);
cancel.setEnabled(false);
ok.setEnabled(false);
invalid.setVisible(true);
}catch(Exception e1)
e1.printStackTrace();
if (a.getSource()==cancel)
log.setVisible(false);
if (a.getSource()==iok)
invalid.setVisible(false);
loginf.setText("");
passf.setText("");
cancel.setEnabled(true);
ok.setEnabled(true);
public static void main(String[] args)
new Login();
-------------inquiry.java---------------------------------
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.Date;
import java.text.*;
import java.sql.*;
public class Inquiry implements ActionListener
Frame inqry;
Label name,addr;
TextField namef,addrf;
Button ok,cancel,dok;
Dialog invalid;
Frame result; //Result of the inquiry....
Label lrname,lraddr,lward,lrdate,lcdate;
TextField rname,raddr,ward,rdate,cdate;
Date d;
DateFormat df;
Button rok,rcancel;
Dialog success;
Button rdok;
DBconnect db;
Inquiry()
db=new DBconnect();
inqry=new Frame("Inquiry Form");
inqry.setLayout(null);
inqry.setBackground(Color.cyan);
name=new Label(" NAME ");
addr=new Label("ADDRESS");
namef=new TextField(20);
addrf=new TextField(20);
ok=new Button("OK");
cancel=new Button("CANCEL");
dok=new Button("OK");
invalid=new Dialog(inqry,"Invalid Name or Address !");
invalid.setSize(300,100);
invalid.setLocation(300,180);
invalid.setBackground(Color.orange);
invalid.setLayout(new FlowLayout());
result=new Frame(" INQUIRY RESULT "); //Result Window......
result.setLayout(null);
result.setBackground(Color.cyan);
lcdate=new Label(" DATE ");
lrname=new Label(" NAME ");
lraddr=new Label(" ADDRESS ");
lward=new Label(" WARD ");
lrdate=new Label(" ADMIT-DATE ");
cdate=new TextField(10);
rname=new TextField(20);
rname.setEnabled(false);
raddr=new TextField(20);
raddr.setEnabled(false);
ward=new TextField(20);
ward.setEnabled(false);
rdate=new TextField(10);
rdate.setEnabled(false);
cdate=new TextField(20);
d=new Date();
df=DateFormat.getDateInstance(DateFormat.MEDIUM,Locale.KOREA);
cdate.setText(df.format(d));
cdate.setEnabled(false);
rok=new Button(" OK ");
rcancel=new Button("CANCEL");
name.setBounds(40,50,50,25);
namef.setBounds(120,50,130,25);
addr.setBounds(40,100,60,25);
addrf.setBounds(120,100,80,25);
ok.setBounds(60,145,70,25);
cancel.setBounds(140,145,70,25);
lcdate.setBounds(200,50,60,25); //Result Window......
cdate.setBounds(270,50,80,25);
lrname.setBounds(35,85,70,25);
rname.setBounds(140,85,180,25);
lraddr.setBounds(35,120,80,25);
raddr.setBounds(140,120,100,25);
lward.setBounds(35,155,80,25);
ward.setBounds(140,155,100,25);
lrdate.setBounds(30,190,80,25);
rdate.setBounds(140,190,80,25);
rok.setBounds(70,240,70,25);
rcancel.setBounds(170,240,70,25);
inqry.add(name);
inqry.add(namef);
inqry.add(addr);
inqry.add(addrf);
inqry.add(ok);
inqry.add(cancel);
invalid.add(dok);
result.add(lcdate); //Result Window......
result.add(cdate);
result.add(lrname);
result.add(rname);
result.add(lraddr);
result.add(raddr);
result.add(lward);
result.add(ward);
result.add(lrdate);
result.add(rdate);
result.add(rok);
result.add(rcancel);
ok.addActionListener(this);
cancel.addActionListener(this);
dok.addActionListener(this);
rok.addActionListener(this); //Result Window......
rcancel.addActionListener(this);
inqry.setSize(280,180);
inqry.setLocation(300,180);
inqry.setVisible(true);
result.setSize(400,280); //Result Window......
result.setLocation(200,150);
result.setVisible(false);
public void actionPerformed(ActionEvent ae)
if(ae.getSource()==ok)
try
String nm=namef.getText();
String ad=addrf.getText();
inqry.setVisible(false);
ResultSet rs=db.s.executeQuery("select * from Billinformation");
while(rs.next())
String nm1=rs.getString(2).trim();
String ad1=rs.getString(3).trim();
int k=0;
if((nm1.equals(nm))&&(ad1.equals(ad)))
String adm=rs.getString(5).trim();
String wr=rs.getString(6).trim();
String bd=rs.getString(8).trim();
String wrb=wr+"-"+bd;
result.setVisible(true);
rname.setText(nm1);
raddr.setText(ad1);
ward.setText(wrb);
rdate.setText(adm);
k=1;
break;
}//if
else if(k==1)
invalid.setVisible(true);
}//while
}//try
catch(Exception e)
e.printStackTrace();
} //getsource ==ok
if(ae.getSource()==cancel)
inqry.setVisible(false);
if(ae.getSource()==rok) //Result Window......
namef.setText("");
addrf.setText("");
result.setVisible(false);
inqry.setVisible(true);
if(ae.getSource()==rcancel)
result.setVisible(false);
if(ae.getSource()==dok)
namef.setText("");
addrf.setText("");
invalid.setVisible(false);
inqry.setVisible(true);
public static void main(String args[])
new Inquiry();
PLease Help me !!
I need this urgently.can you explain what your program tries to do... and
at where it went wrong..Sir,
We are trying to make an project where we can make a person register in our data base & after which he/she can search for other user.
The logged in user can modify his/her own data but can view other ppl's data.
We are in a phase of registering the user & that's where we are stuck. The problem is that after the login screen when we hit register (OK- button) the data are not getting entered in the data base.
Can u please help me??
I am using "jdk1.3' - studnet's edition.
I am waiting for your reply.
Thanks in advance & yr interest. -
Hi,
I just set up a 3rd-gen Apple TV. W/ iTunes Match & Home Sharing, I'm able to play my songs or TV shows on my TV.
Then, I installed the Apple Remote app on my iPad. It points to my Apple TV but then can displays & plays only the songs, not the TV shows.
When I fire up iTunes on my PC, I can point the Remote app to my iTunes library on my PC, which includes both songs & TV shows. When I close or turn off the PC, then I lose the pointer.
Questions:
(1) Why can't I just point the Remote app to iCloud/iTunes Match - and access ALL my content (i.e., both songs & TV shows)? Why do I need to point to my local PC to access all content?
(2) Is it that iCloud/iTunes Match store only songs & not TV shows/other content? Is that why I need to point to a local machine to access TV shows?
Let me know -iTunes match is for music and music video only.
-
Flash Player use to execute the main class entry point before rendering. Now it does not
Adobe Flash Player use to execute the main class entry point before rendering the first frame. Now using the latest browsers and Flash Player 11.8 (11.8.800.94, or 11.8.800.97 for Chrome).
With one of our swf apps, there are visual display objects on the first frame of the timeline. When the main class constructor is executed, those display objects are set to visible = false. So previously those display objects were never displayed because the first frame did not render until after the main class code was ran.
Now when we browse to the our website, we find that those display objects are visible for a split moment of time (such as a quarter of a second).
It appears that this may be a bug. We are wondering this could be new behavior based on loading/unloading the swf to optimize CPU usage and that Flash Player is taking a snapshot of the internal state of the first frame and displaying the cached snapshot before it actually loads.
So...Chris (or other Adobe representative), is Flash Player supposed to be rendering the display before any code executes it runs the main class?Not that I'm aware of. If this is something that just started with 11.8, then we could be running into some sort of bug injection. Could you please open a new bug report on this over at bugbase.adobe.com? When adding the bug, please include sample code, application or URL so we can quickly test this out internally. If you'd like to keep this private, feel free to email the attachment to me directly ([email protected]).
Once added, please post back with the bug number and we'll investigate from there. -
why does a red exclamation point keep showing up next to my outgoing text?
It means you are trying to communicate with a person who the device cannot reach. Are you using a phone number or email to reach this person? Check your settings for iMessage and make sure that "Send as SMS" is ON.
-
Is it possible to print separate pages on the same sheet in preview. I would like to split a set of class power points to display Page 1 and 2 on the first page, page 3 and 4 on the second page etc.
Thanks in advance!Nevermind everyone!
I got it to work with Print Down/Across...silly me.
Thanks anyway!
-Arin
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