Problems on protected methods

Hi!
Im rhani, im new to java programming....i was trying to run this code from a book (below) :
import java.awt.*;
public class FrameExample extends Frame {
public static void main(String args[]){
FrameExample win = new FrameExample();
public FrameExample() {
super("FrameExample");
pack();
resize(400,400);
show();
public void paint(Graphics g) {
g.drawString("A Basic Window Program",100,100);
public boolean handleEvent(Event event) {
if(event.id==Event.WINDOW_DESTROY){
System.exit(0);
return true;
}else return false;
(Im using jdk1.3.1_12)
ahmm now it says that the method handleEvent is deprecated. Now then I tried to replaced it with :
protected void processEvent (AWTEvent e) {
if (e.getID == Event.WINDOW_DESTROY) {
System.exit(0);
no errors but i know my "if " condition is wrong....when i try to use e.id == WINDOW_DESTROY it says that im trying to access a protected method on that. Im just having difficulty in what really does a protected method does..or its limitations....and how would I be able to handle that the user is trying to close the frame/window. I would really do appreciate your help on this....I hope I had explained it clearly, ahm im not good in english...ahmm thank you very much!!!

thank you very much sir for the fast reply...ahm i dont know if Im using the right method...ahmm its just that the documentation here http://java.sun.com/j2se/1.3/docs/api/ says that it inherits a method from Class Component, then it says that I should use processEvent, ahm the processEvent there is declared protected void processEvent ( AWTEvent e). Then on e.getID() ahm it says that it returns an int value I just thought that its value is like WINDOW_DESTROY or something...thank you very much again sir for the help...

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Java access to protected methods

Hi,
I use a java toolkit, and want to access a class (Morphy) in it.
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http://nlp.stanford.edu/nlp/javadoc/wn/doc/danbikel/wordnet/Morphy.html
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The reason I ask involves a current project of mine. I have an inheritance hierarchy including an abstract Event base class with many concrete derived Events. I want to define many protected methods in the base Event class, which all my derived Events will use, in order to save me a lot of coding. I'm also trying to make my program reusable, and isolate the protocol changes to this Event hierarchy and a Packet hierarchy as well. For both these hierarchies, I want to implement interfaces that make sure that the programmer defines these necessary, protected methods. Yet I cannot declare protected methods in my interfaces!

> I have this same desire: to have protected
methods within interfaces.
Interfaces are not intended to (nor can they) provide
implementation.Yes, this is clear. Yet they "promise" an implementation. In the Java interface model, they only promise the public interface. I have yet to see why they cannot promise protected methods. I'm not really interested in code inheritance (reusing the code). I'm interested in what is called interface inheritance to achieve certain polymorphic goals.
>
> any design patterns that can be used to get
around this problem.
I'd suggest using composition rather than
inheritance. Let me know if I should explain
further.
Yes, I understand about composition (or delegation) as a way to "inherit" the functionality; however, I want to treat the subclasses polymorphically. I'm designing class library/frameworks that require a certain level of structure. The subclasses need to maintain the encapsulation provided by protected methods. I don't want external clients calling the protected methods, but the only way to achieve multiple (interface) inheritance is through Java's public interfaces, which then exposes the methods. I see no way around this problem. I'm not familar with the technical challenges of implementing multiple inheritance within compilers etc. At first glance, I don't see why allowing methods to be declared protected within the Java interface construct would cause serious technical problems.
~
P.S. Yes, this is an old thread...
Sorry, yes this is an old thread. I did some searching on this topic and this thread came up. Thanks for your reply.

Protected methods in abstract classes

Hello All
I have some problem which I cannot find a workaround for.
I have three classes:
package my.one;
public abstract class First {
protected void do();
protected void now();
package my.one;
public class NotWantToHave extends First {
protected First obj;
public NotWantToHave(First O) { obj = O; }
public void do() { obj.do(); }
public void now() { obj.now(); }
package my.two;
public class Second extends my.one.First {
protected void do() { System.out.println("Second does"); }
protected void now() { System.out.println("Second does now"); }
package my.three;
public class Three extends my.one.First {
protected my.one.First obj;
public Three(my.one.First O) { obj = O; }
protected void do() { System.out.println("Doing"); }
protected void now() { obj.now(); } // Not possible, see later text
Problem is, as one can read in http://java.sun.com/docs/books/tutorial/java/javaOO/accesscontrol.html , it says that you cannot access protected members and methods from classes if they are in a different package. However, since my class Three should not concern about the method now() but should use from some other class that implements (i.e. class Second), the question I have is how to do?
One way would be to implement a class that simply make a forward call to any protected method in the same package the abstract class is in like in class NotWantToHave and pass it to the constructor of class Third while this class was created with an instance of class Second. However, such a call would look very clumsy (new my.three.Third(new my.one.NotWantToHave(new my.two.Second()));). Furthermore, everyone could create an instance of class NotWantToHave and can invoke the methods defined as protected in class First, so the access restriction would be quite useless.
Does anyone has a good idea how to do?

Hi
One way I found is to have a nested, protected static final class in my super-class First and provide a protected static final method that returns a class where all methods of the super-class are made public and thus accessible from sub-classes at will. The only requirement is that a sub-class must invoke this method to encapsulate other implementations of the super-class and never publish the wrapper class instance. This will look as follows:
package my.one;
public abstract class First {
protected final static class Wrap extends First { // extend First to make sure not to forget any abstract method
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    public void do() { F.do(); }
    public void now() { F.now(); }
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} // end Wrap
protected final static First.Wrap wrap(First Obj) { return new First.Wrap(Obj); }
protected abstract void do();
protected abstract void now();
} // end First*******
package my.two;
public class Second extends my.one.First {
protected void do() { System.out.println("Second does"); }
protected void now() { System.out.println("Second does now"); }
} // end Second*******
package my.three;
public class Three extends my.one.First {
protected my.one.First.Wrap obj;
public Three(my.one.First O) { obj = my.one.First.wrap(O); }
protected void do() { System.out.println("Doing"); }
protected void now() { obj.now(); } // Not possible, see later text
} // end Third*******
In this way, I can access all methods in the abstract super class since the Wrap class makes them public while the methods are not accessible from outside the package to i.e. a GUI that uses the protocol.
However, it still looks clumsy and I would appreciate very much if someone knows a more clear solution.
And, please, do not tell me that I stand on my rope and wonder why I fall down. I hope I know what I am doing and of course, I know the specification (why else I should mention about the link to the specification and refer to it?). But I am quite sure that I am not the first person facing this problem and I hope someone out there could tell me about their solution.
My requirements are to access protected methods on sub-classes of a super-class that are not known yet (because they are developed in the far, far future ...) in other sub-classes of the same super-class without make those methods public to not inveigle their usage where they should not be used.
Thanks

Constructor question - dealing with protected methods

Hi all, I'm trying to run a protected method, got somewhere by making the class a subclass - but not too sure about where to put the constructor for a class I'm trying to use (IQRegister). Can anyone help and point me in the right direction as to what I did wrong?
public class Registration extends IQRegister {
//Create new instance of ConnectionBean
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InfoQueryBuilder iqb = new InfoQueryBuilder();
InfoQuery iq;
//IQRegisterBuilder iqRegb = new IQRegisterBuilder();
public Registration( IQRegisterBuilder iqRegb ) {
super( iqRegb );
//This constructor needs to go somewhere that will work>>>>>>>>>>>>>>
IQRegister iqReg = new IQRegister( iqRegb );
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String server = JOptionPane.showInputDialog( "Enter Server address" );
InetAddress inetaddress;
try {
conBean.connect( inetaddress = InetAddress.getByName( server ));
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Object aobj[] = {
"Cancel", "OK"
int i = JOptionPane.showOptionDialog(null, "Retry Server?", server +
": Not Responding", -1, 2, null, aobj, aobj[1]);
if( i == 1 )
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registrationProcess();
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location: class Registration
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^
1 error
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Made some changes to code but getting some varied error here:
Registration.java:31: <identifier> expected
iqReg = new IQRegister( iqRegb );
^
Registration.java:31: cannot resolve symbol
symbol : class iqReg
location: class Registration
iqReg = new IQRegister( iqRegb );
^
Registration.java:104: cannot resolve symbol
symbol : variable iqReg
location: class Registration
iqReg.getXMLNS();
^
3 errors
CODE:
public class Registration extends IQRegister {
//Create new instance of ConnectionBean
ConnectionBean conBean = new ConnectionBean();
InfoQueryBuilder iqb = new InfoQueryBuilder();
InfoQuery iq;
//IQRegisterBuilder iqRegb = new IQRegisterBuilder();
//This constructor problem here>>>>>>>>>>>>
iqReg = new IQRegister( iqRegb );
public Registration( IQRegisterBuilder iqRegb ) {
super( iqRegb );
.......same code..... as above....
Thank you so much for the guidance..

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Thanks,
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Sorry, you were correct... I was going between jdk1.4
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cool_kkin wrote:
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ALV - access to protected method

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James Hawthorne
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      when 'UPDA'. "From Tool bar
        perform refresh_disp.
        perform update_table.
      when 'EXIT'. "From Tool bar
        leave program.
    endcase.
endmethod.                    "user_command
endclass.                    "lcl_grid_event_receiver IMPLEMENTATION
program data
include <icon>.
define any old internal structure NOT in DDIC
types: begin of s_elements,
anyfield1(20) type c,
anyfield2(20) type c,
anyfield3(20) type c,
anyfield4(20) type c,
anyfield5(11) type n,
end of s_elements.
data: wa_element type s_elements,
wa_data type s_elements.
Note new RTTI functionality allows field detail retrieval
at runtime for dynamic tables.
data:
        grid1 type ref to zcltest,
        grid_handler type ref to lcl_grid_event_receiver,
        c_dec2 type s_elements-anyfield5,
        wa_it_fldcat type lvc_s_fcat,
        it_fldcat type lvc_t_fcat,
        lr_rtti_struc TYPE REF TO cl_abap_structdescr, "RTTI
        lt_comp TYPE cl_abap_structdescr=>component_table,"RTTI
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        struct_grid_lset type lvc_s_layo,
        l_valid type c,
        new_table type ref to data.
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data: zogt type table of struc,
        grid_container1 type ref to cl_gui_custom_container,
        g_event_receiver type ref to lcl_grid_event_receiver,
        ok_code like sy-ucomm,
        i4 type int4.
start-of-selection.
call screen 100.
module status_0100 output.
if grid_container1 is initial.
    create object grid_container1
    exporting
    container_name = 'CCONTAINER1'.
    assign grid_container1 to <g1>.
    create object grid1
     exporting i_parent = grid_container1.
we need reference to this instance so we can use
Methods etc of zcltest class and alv (superclass)
in our event receiver class.
     assign grid1 to <g2>.
    create object grid_handler.
    set handler:
    grid_handler->user_command for grid1,
    grid_handler->toolbar for grid1,
    grid_handler->handle_data_changed for grid1.
Get the Internal table structure
    lr_rtti_struc ?= cl_abap_structdescr=>describe_by_data( wa_data ).
Build field catalog just use basic data here
colour specific columns as well
    zogt[] = lr_rtti_struc->components.
      call method grid1->create_dynamic_fcat
      EXPORTING
        zogt      = zogt
      IMPORTING
        it_fldcat = it_fldcat.
Create dynamic internal table and assign to field symbol.
Use dynamic field catalog just built.
call method cl_alv_table_create=>create_dynamic_table
    EXPORTING
      it_fieldcatalog = it_fldcat
    IMPORTING
      ep_table        = new_table.
assign new_table->* to <dyn_table>.
    perform populate_dynamic_itab.
    perform init_grid.
    perform register_enter_event.
set off ready for input initially
    i4 = 0.
    call method grid1->set_ready_for_input
      EXPORTING
        i_ready_for_input = i4.
endif.
endmodule.                    "status_0100 OUTPUT
module user_command_0100 input.
*PAI not needed in OO ALV anymore as User Commands are handled as events
*in method user_command.
*we can also get control if the Data entered and the ENTER is pressed by
*raising an event.
Control then returns to method handle_data_changed.
endmodule.                    "user_command_0100 INPUT
form populate_dynamic_itab.
load up a line of the dynamic table
c_dec2 = c_dec2 + 11.
wa_element-anyfield1 = 'Tabbies'.
wa_element-anyfield2 = 'ger.shepards'.
wa_element-anyfield3 = 'White mice'.
wa_element-anyfield4 = 'Any old text'.
wa_element-anyfield5 = c_dec2.
append wa_element to <dyn_table>.
endform.                    "populate_dynamic_itab
form exit_program.
call method grid_container1->free.
call method cl_gui_cfw=>flush.
leave program.
endform.                    "exit_program
form refresh_disp.
call method grid1->refresh_table_display.
endform.                    "refresh_disp
form update_table.
The dynamic table here is the changed table read from the grid
after user has changed it
Data can be saved to DB or whatever.
loop at <dyn_table> into wa_element.
do what you want with the data here
endloop.
switch off edit mode again for next function
i4 = 0.
call method grid1->set_ready_for_input
    EXPORTING
      i_ready_for_input = i4.
endform.                    "update_table
form set_input.
i4 = 1.
call method grid1->set_ready_for_input
    EXPORTING
      i_ready_for_input = i4.
endform.                    "set_input
form switch_input.
if i4 = 1.
    i4 = 0.
else.
    i4 = 1.
endif.
call method grid1->set_ready_for_input
    EXPORTING
      i_ready_for_input = i4.
endform.                    "switch_input
form init_grid.
Enabling the grid to edit mode,
struct_grid_lset-edit = 'X'. "To enable editing in ALV
struct_grid_lset-grid_title = 'Jimbos Test'.
   call method grid1->set_table_for_first_display
    EXPORTING
      is_layout       = struct_grid_lset
    CHANGING
      it_outtab       = <dyn_table>
      it_fieldcatalog = it_fldcat.
endform.                    "init_grid
form register_enter_event.
call method grid1->register_edit_event
    EXPORTING
      i_event_id = cl_gui_alv_grid=>mc_evt_enter.
Instantiate the event or it won't work.
create object g_event_receiver.
set handler g_event_receiver->handle_data_changed for grid1.
endform.                    "register_enter_event

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========================================================
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package foo;
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Hi there, I'm trying to understand why I cant access a Protected Method from a library that I'm trying to use..
Some guidance would be great:
public class Registration {
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^
1 error
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