Inherited methods of super class not shown in outline
Hello, is there a possibility to display the methods and variables from the super class in the outline of the inheriting class in AiE?
Hi Christian,
We had discussed this, when we implemented the outline and quick outline some years, ago. Finally, we sticked to the approach that is used by other plug-ins in Eclipse (like JDT).
There Outline View shows only the content of the current editor. This helps to keep the content of the view stable when you select an element for navigation (because you won't be able to switch the editor by selecting an element ).
Inherited members are usually part of other editors, unless you have redefined a method in your current class. Therefore, they are not shown in Outline View (unless they are redefinitions).
The filters like "Hide Non-Public Members of classes" can only hide elements of the current editor.
Inherited members can be shown in the Quick Outline, because the interaction pattern is different there: If you navigate to an element the pop-up is closed. Therefore, a content change of the Quick-Outline does not hurt.
Michael
Similar Messages
-
Is there any way to access an overridden method of super class?
class Animals
void makeNoice(){System.out.println("General noice");}
class Dog extends Animals
void makeNoice(){System.out.println("bark");}
};Is there any way to access the makeNoice() of Animals class from a Dog object
Dog dog = new Dog();
Animal animaldog = dog;
animaldog.makeNoice(); // will always calls Dog's makeNoice() ie the overriden method.
Is there a way to access the Animals makeNoice() method ? by using cast or super etc?
Or it is not possible at all?Rajeebs wrote:
Now another question coming in my mind.
Whether any way to access a method which belong to super class's super class without using any method of class B,
like super.super.fn() ??Isn't this just the same question again? And won't you again just "solve" it by writing some invokeSuperSuperMethod or other? This flawed design is quickly getting out of hand, isn't it? The question isn't "How can I invoke an arbitrarily deep superclass' method?" but more "Why do I need to invoke a method belonging to a concrete type at all?". If you need to do that, chances are you've misused inheritance.
To use your initial sample code, in what circumstance would you require that a Dog make anything other than a Dog noise? It makes no sense. Point is, you have an Animal abstraction, and can call makeNoise on any instance of any subclass, and it will make the appropriate noise. By trying to use trickery to force other noises, you're doing something unnatural, and you're also depending on actual specific concrete subclasses. If you're going to go to specific classes and ask them to make their noise, what use is the inheritance? What use it the polymorphism?
Are we heading into another "I've got a brilliant idea for a [useless language feature|http://forums.sun.com/thread.jspa?threadID=5423706&messageID=10905772#10905772], guys!" thread? -
Implementing UIApplicationDelegate protocol methods in NSObject class not working.
Hi Everyone,
I am new bee in iphone developement. I want to implement UIApplicationDelegate protocol methods in one of my NSObject class, how can i implement that help me please.
I have mentioned the sample code what acutal i want to impelment.
.h file
@interface SmaplClass : NSObject <UIApplicationDelegate>
.m file
- (void)applicationWillResignActive:(UIApplication *)application
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
-(void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
- (void)application:(UIApplication*)application didFailToRegisterForRemoteNotificationsWithError:(NSError*)error
Want to implement the above methods is NSObject class to be implemented or used, its not working. Help me can do it.
Please help me
Thanks,I complete the above discussion with saying that it is better to implement the notification handling methods in your app delegate. If there are good reasons to not to do so, you have to implement the methods in another class, instantiate the class, and call the methods from the actual UIApplicationDelegate protocol methods in the AppDelegate object. This way you can remove the actual notification handling code from AppDelegate class.
For example, suppose you implemented the methods in the class called Test. This is a sample code in the AppDelegate class:
@implementation AppDelegate
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
Test *t = [[Test alloc] init];
[t application: application didReceiveRemoteNotification: userInfo];
@end
Or you can create an association relationship between the AppDelegate and Test, so you do not have to create a new Test instance in each of the remote notification handling methods:
@interface AppDelegate {
Test *test;
@end
@implementation AppDelegate
+ (id)init {
if (self = [super init]) {
test = [[Test alloc] init];
return self;
- (void)dealloc {
[test release];
[super dealloc];
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
// No need to create a Test instance. You just forward the call from AppDelegate instance to test // instance
[test application: application didReceiveRemoteNotification: userInfo];
@end -
Overwriting inherited method of a class
Hi all,
http://help.sap.com/saphelp_erp2004/helpdata/en/65/d4463c9c9ffc3ae10000000a114084/frameset.htm
As given in the above link I inherited the class CL_BSP_CONTROLLER2. When I try to overwrite a method called DO_REQUEST I'm prompted for an access key.
Did I miss something?
Regards
NoufalYou have to click on the button called "<b>Redefine</b>" which is between "<b>Find Next</b>" and "<b>Undo</b>".
Regards
Raja -
Swf containing my classes not shown when runned on a server
Hi everyone,
I hope you can help me!
I am trying to show my swf on my localhost server, and everyting looks just great when adding a simple box in my main file.
However, the problem commes when creating the same box in a class and the call that class from the main file. Running it
locally from my machine everything looks as it should, however when trying to run the swf from my localhost server nothing is
beeing showed..soo what am I doing wrong here?
I really hope you can help me!!For the first approach you need to have the flv and the swf loaded to the server, and the two javascript files that the html page indicates...
If the swf file is in a different directory than the html page, then you may need to adjust the url you use to target the flv. It should be specified as if the swf file is in the same folder as the html page. So if the html page uses "images/pagepeak2-1.swf" to load the swf, then the swf would have to use "images/pagepeak2_3.flv" to load the flv if the flv is also in the images folder. The alternative would be to not change the coding and move the flv to the html page's folder. -
Error while calling a super class public method in the subclass constructor
Hi ,
I have code like this:
CLASS gacl_applog DEFINITION ABSTRACT.
PUBLIC SECTION.
METHODS:
create_new_a
IMPORTING pf_obj TYPE balobj_d
pf_subobj TYPE balsubobj
pf_extnumber TYPE string
EXPORTING pfx_log_hndl TYPE balloghndl
EXCEPTIONS error
ENDCLASS.
CLASS gacl_applog IMPLEMENTATION.
METHOD create_new_a.
DATA: ls_log TYPE bal_s_log.
Header aufsetzen
MOVE pf_extnumber TO ls_log-extnumber.
ls_log-object = pf_obj.
ls_log-subobject = pf_subobj.
ls_log-aluser = sy-uname.
ls_log-alprog = sy-repid.
ls_log-aldate = sy-datum.
ls_log-altime = sy-uzeit.
ls_log-aldate_del = ls_log-aldate + 1.
CALL FUNCTION 'BAL_LOG_CREATE'
EXPORTING
i_s_log = ls_log
IMPORTING
e_log_handle = pfx_log_hndl
EXCEPTIONS
OTHERS = 1.
IF ( sy-subrc NE 0 ).
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4
RAISING error.
ENDIF.
ENDMETHOD.
CLASS gcl_applog_temp DEFINITION INHERITING FROM gacl_applog.
PUBLIC SECTION.
DATA: log_hndl TYPE balloghndl READ-ONLY
, t_log_hndl TYPE bal_t_logh READ-ONLY
METHODS: constructor
IMPORTING pf_obj TYPE balobj_d
pf_subobj TYPE balsubobj
pf_extnumber TYPE string
EXCEPTIONS error
, msg_add REDEFINITION
, display REDEFINITION
ENDCLASS.
CLASS gcl_applog_temp IMPLEMENTATION.
METHOD constructor.
CALL METHOD create_new_a
EXPORTING pf_obj = pf_obj
pf_subobj = pf_subobj
pf_extnumber = pf_extnumber
IMPORTING pfx_log_hndl = log_hndl.
IF ( sy-subrc NE 0 ).
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4
RAISING error.
ENDIF.
ENDMETHOD.
A public method of Super class has been called from the constructor of the sub class. we are getting the syntax error :
' In the constructor method, you can only access instance attributes, instance methods, or "ME" after calling the constructor of the superclass '
Can you please suggest how to change the code with out affecting the functioanlity.
Thank you ,
Lakshmi.Hi,
Call that method by instance of Subclass. OR
SUPER-->method.
Read very useful document
Constructors
Constructors are special methods that cannot be called using CALL METHOD. Instead, they are called automatically by the system to set the starting state of a new object or class. There are two types of constructors - instance constructors and static constructors. Constructors are methods with a predefined name. To use them, you must declare them explicitly in the class.
The instance constructor of a class is the predefined instance method CONSTRUCTOR. You declare it in the public section as follows:
METHODS CONSTRUCTOR
IMPORTING.. [VALUE(]<ii>[)] TYPE type [OPTIONAL]..
EXCEPTIONS.. <ei>.
and implement it in the implementation section like any other method. The system calls the instance constructor once for each instance of the class, directly after the object has been created in the CREATE OBJECT statement. You can pass the input parameters of the instance constructor and handle its exceptions using the EXPORTING and EXCEPTIONS additions in the CREATE OBJECT statement.
The static constructor of a class is the predefined static method CLASS_CONSTRUCTOR. You declare it in the public section as follows:
CLASS-METHODS CLASS_CONSTRUCTOR.
and implement it in the implementation section like any other method. The static constructor has no parameters. The system calls the static constructor once for each class, before the class is accessed for the first time. The static constructor cannot therefore access the components of its own class.
Pls. reward if useful.... -
Overwriting a method of a super class in the subclass ???
Hi,
can somebody tell me whether it's possible to add a new implementation of a method in the sub class which is inherited from a super class?
I want to model my program in that way:
1. I define a super class with some implemented methods.
2. This class should be inherited in a sub class. One method should be used as it was implemented in the super class but another method should be overwritten in the subclass.
I know this concept from Java but I couldn't find a way how to do it in ABAP
Many thanks for any help!
Best regards,
Birgithi,
yeas you can do it,
Subclass can re-implement the inherited public and protected methods from superclass.Class C1 contains method METH1(public) and METH2(protected), both of which are modified and re-implemented in its subclass C2.also you can have ur own methods in subclass.Objects are created out of both classes and the method METH1 for both objects are called.
Output of the program demonstrates different behaviour for method METH1 of class C1 and C2.
This demonstrates the theme.
REPORT YSUBDEL.
CLASS C1 DEFINITION.
PUBLIC SECTION.
METHODS : METH1.
PROTECTED SECTION.
METHODS METH2.
ENDCLASS.
CLASS C1 IMPLEMENTATION .
METHOD : METH1.
WRITE:/5 'I am meth1 in class C1'.
CALL METHOD METH2.
ENDMETHOD.
METHOD : METH2.
WRITE:/5 ' I am meth2 in class C1 '.
ENDMETHOD.
ENDCLASS.
CLASS C2 DEFINITION INHERITING FROM C1.
PUBLIC SECTION.
METHODS : METH1 redefinition,
meth3.
PROTECTED SECTION.
METHODS : METH2 redefinition.
ENDCLASS.
CLASS C2 IMPLEMENTATION.
METHOD METH1.
WRITE:/5 'I am meth1 in class C2'.
call method meth2.
endmethod.
METHOD : METH2.
WRITE:/5 ' I am meth2 in class C2 '.
ENDMETHOD.
METHOD : METH3.
WRITE:/5 ' I am own method of class C2'.
ENDMETHOD.
endclass.
START-OF-SELECTION.
DATA : OREF1 TYPE REF TO C1 ,
OREF2 TYPE REF TO C2.
CREATE OBJECT : OREF1 , OREF2.
CALL METHOD : OREF1->METH1 ,
OREF2->METH1.
hope it helps,
regards -
Inheriting and the "super" keyword
I found a case where "super" is not working as I understand it should...
Can someone explain me the underlying theory that makes JAVA behave this way??
public class Base {
public void method1() {
System.out.println("method1 from \"Base\" class. About to call method2.");
method2();
public void method2() {
System.out.println("method2 from \"Base\" class. About to call method3.");
method3();
public void method3() {
System.out.println("method3 from \"Base\" class.");
public class Extension extends Base {
@Override
public void method1(){
System.out.println("method1 from \"Extension\" class. About to call super.method2.");
super.method2();
@Override
public void method2(){
System.out.println("method2 from \"Extension\" class. About to call method3.");
method3();
@Override
public void method3(){
System.out.println("method3 from \"Extension\" class.");
public class Main {
public static void main(String args[]) {
System.out.println("In \"The Java Programming Language,\n" +
"Fourth Edition By Ken Arnold, James Gosling, David Holmes\"\n"+
"chapter: 3.3: \"Inheriting and Redefining Members\""+
" says:");
System.out.println("Using super is the only case in which the type of\n" +
"the reference governs selection of the method implementation\n" +
"to be used. An invocation of super.method always uses the\n" +
"implementation of method the superclass defines (or\n" +
"inherits). It does not use any overriding implementation of\n" +
"that method further down the class hierarchy.\n");
System.out.println("But by running this code, i get:");
System.out.println("------------------------------------------");
Extension ext = new Extension();
ext.method1();
System.out.println("------------------------------------------");
System.out.println("\nWHY??? I was expecting:\n"+
"method1 from \"Extension\" class. About to call super.method2.\n" +
"method2 from \"Base\" class. About to call method3.\n" +
"method3 from \"Base\" class.");
THANKS!!IgnacioKriche wrote:
But I used "super", so this means to use the methods of the super class and I understand that a method called within another, is part of this last one. this is:
if inside method 'x', method 'y' is called, then 'y' is part of 'x' . Agree? And therefore since I am using super I'm saying use 'x' method from super class since 'y' is part of 'x' then super applies for 'y' as well so what is method from the extended class doing here? It's like we have a mix between the 'x' from super and 'y' from the extended. Something like super only applies for the first level not at a deeper level (a method called from another)No. Just because the base class method2() invokes method3() does NOT mean it will always invoke base's version of method3. If it did that, then polymorphism would definitely be broken.
You explicitly invoked super.method2(), so that told the compiler to explicitly use the base class version of that method. But then method2 in the base class invokes method3(). That ends up invoking the overridden version in the subclass, by design, because afterall the actual object whose methods are being executed is a subclass instance. If it didn't do that, then polymorphism would be broken for everyone else.
If you think you need the behavior you are looking for, you are just designing it wrong in the first place. -
Accessing Super Class of Super Class
Consider the following classes
Class A {
print() {
System.out.println("Class A Called");
Class B extends A {
print() {
System.out.println("Class B Called");
Class C extends B {
print() {
System.out.println("Class C Called");
How can I call the print method of class A while working in class C ? Please state all possible solutions.
Can it somehow be done using super ?RZP wrote:
Consider the following classes
Class A {
print() {
System.out.println("Class A Called");
Class B extends A {
print() {
System.out.println("Class B Called");
Class C extends B {
print() {
System.out.println("Class C Called");
How can I call the print method of class A while working in class C ? Please state all possible solutions.
Can it somehow be done using super ?Here is one possible solution.
I really don't understand the ramifications of reflection... and am not familiar with OOP design... but reflection seems to enable a programmer to avoid OOP design principals as well as type-checking. While I like reflection, most of my readings suggest to rarely use it.
public class Main {
public static void main(String[] args) {
try {
new C(789).print();
} catch(Exception e) { e.printStackTrace(); }
static class A {
protected A a;
protected int id;
public A(A a, Integer id) {
this.a = a;
this.id = id;
public A(int id) { this.id = id; }
public void print() {
System.out.println("Class A called... from a " + a.getClass().getCanonicalName() + " using the original instance with id = " + a.id);
static class B extends A {
public B(A a, Integer id) { super(a, id); }
public B(int id) { super(id); }
public void print() { System.out.println("Class B called..."); }
static class C extends B {
public C(A a, Integer id) { super(a, id); }
public C(int id) { super(id); }
public void print() {
try {
System.out.println("Class C called...");
Object obj = getClass().getSuperclass().getSuperclass().getConstructor(A.class, Integer.class).newInstance(this, -111);
obj.getClass().getMethod("print", null).invoke(obj, null);
} catch (Exception e) {
e.printStackTrace();
}Anyway, I think that enables one to invoke overridden methods in super classes, regardless of how "high-up" they are in the class heirarchy (without having to use a new object to do it). Use that idea in an interview at your own risk but just not in interviews for the same position I am trying to get...
Edited by: dpxqb on Apr 17, 2010 4:43 AM -
Hi,
I have created one class in SE24. This class will be used as a super class for other classes.
When subclasses are derived from this superclass, i want to make sure that some of the methods of superclasses are redefined by the subclasse compulsarily.
So i want to force the subclasses to redefine complusarily some of the methods of its super class.
Is this feasible. If so please let me know the corresponding approach.
Thanks in advance !
PramodHi,
Check this out this will help you.
Inheritance is the concept of passing the behavior of a class to another class.
1.You can use an existing class to derive a new class.
2.Derived class inherits the data and methods of a super class.
3.However they can overwrite the methods existing methods and also add new once.
4.Inheritance is to inherit the attributes and methods from a parent class.
Inheritance:
Inheritance is the process by which object of one class acquire the properties of another class.
Advantage of this property is reusability.
This means we can add additional features to an existing class with out modifying it.
Go to SE38.
Provide the program name.
Provide the properties.
Save it.
Provide the logic for inheritance.
*& Report ZLOCALCLASS_VARIABLES *
*&----------------------------------------------------*REPORT ZLOCALCLASS_VARIABLES.
*OOPS INHERITANCE
*SUPER CLASS FUNCTIONALITY
*DEFINE THE CLASS.
CLASS CL_LC DEFINITION.
PUBLIC SECTION.
DATA: A TYPE I,
B TYPE I,
C TYPE I.
METHODS: DISPLAY,
MM1.
CLASS-METHODS: MM2.
ENDCLASS.
*CLASS IMPLEMENTATION
CLASS CL_LC IMPLEMENTATION.
METHOD DISPLAY.
WRITE:/ 'THIS IS SUPER CLASS' COLOR 7.
ENDMETHOD.
METHOD MM1.
WRITE:/ 'THIS IS MM1 METHOD IN SUPER CLASS'.
ENDMETHOD.
METHOD MM2.
WRITE:/ 'THIS IS THE STATIC METHOD' COLOR 2.
WRITE:/ 'THIS IS MM2 METHOD IN SUPER CLASS' COLOR 2.
ENDMETHOD.
ENDCLASS.
*SUB CLASS FUNCTIONALITY
*CREATE THE CLASS.
*INHERITING THE SUPER CLASS.
CLASS CL_SUB DEFINITION INHERITING FROM CL_LC. "HOW WE CAN INHERIT
PUBLIC SECTION.
DATA: A1 TYPE I,
B1 TYPE I,
C1 TYPE I.
METHODS: DISPLAY REDEFINITION, "REDEFINE THE SUPER CLASS METHOD
SUB.
ENDCLASS.
*CLASS IMPLEMENTATION.
CLASS CL_SUB IMPLEMENTATION.
METHOD DISPLAY.
WRITE:/ 'THIS IS THE SUB CLASS OVERWRITE METHOD' COLOR 3.
ENDMETHOD.
METHOD SUB.
WRITE:/ 'THIS IS THE SUB CLASS METHOD' COLOR 3.
ENDMETHOD.
ENDCLASS.
*CREATE THE OBJECT FOR SUB CLASS.
DATA: OBJ TYPE REF TO CL_SUB.
START-OF-SELECTION.
CREATE OBJECT OBJ.
CALL METHOD OBJ->DISPLAY. "THIS IS SUB CLASS METHOD
CALL METHOD OBJ->SUB.
WRITE:/'THIS IS THE SUPER CLASS METHODS CALLED BY THE SUB CLASS OBJECT'COLOR 5.
SKIP 1.
CALL METHOD OBJ->MM1. "THIS IS SUPER CLASS METHOD
CALL METHOD OBJ->MM2.
*CREATE THE OBJECT FOR SUPER CLASS.
DATA: OBJ1 TYPE REF TO CL_LC.
START-OF-SELECTION.
CREATE OBJECT OBJ1.
SKIP 3.
WRITE:/ 'WE CAN CALL ONLY SUPER CLASS METHODS BY USING SUPER CLASS OBJECT' COLOR 5.
CALL METHOD OBJ1->DISPLAY. "THIS IS SUPER CLASS METHOD
CALL METHOD OBJ1->MM1.
CALL METHOD OBJ1->MM2.
This example will help you to solve your problem.
For more detailed information GOTO -> SAPTECHNICAL ->Tutorials -> Object Oriented Programming.
Regards Madhu.
Code Formatted by: Alvaro Tejada Galindo on Jan 7, 2009 12:13 PM -
Super class methods not shown when Model is generated
I have some EJB's that return a result class, that extend a common class.
eg:
public class Result extends AResult implements Serializable {
method getMethodA();
method getMethodB();
public abstract class AResult implements Serializable{
method getMethodC();
This EJB has been exposed using a web services and I am trying to construct a model based on this WS.
The in the moded, while doing the context mapping i cannot see the
getMethodC()
from the superclass.
However the code for the model seems to be correct i.e. the proxy classes generated have the correct structure.
Anyone encountered this before? Is this a bug?
Thanks,
Manik.thanku very much for the answer.
I am trying to execute the methods of another class using reflection. So I have to consider the inherited methods also. For that, I have to differentiate between standard classes & user-defined classes.Assume that u have one GUI screen where in once u select a class all its methods including inherited methods have to be displayed.
I can get the the superclass using the method getSuperClass(). But inorder to get the protected methods of superclass what is the method to be used ? If I use getMethods(), it returns only public methods, where as getDeclaredMethods() returns all the methods. Since I have to execute only public & protected methods, what is the best way to solve this ? -
Trying to use super class's methods from an anonymous inner class
Hi all,
I have one class with some methods, and a second class which inherits from the first. The second class contains a method which starts up a thread, which is an anonymous inner class. Inside this inner class, I want to call a method from my first class. How can I do this?
If I just call the method, it will use the second class's version of the method. However, if I use "super," it will try to find that method in the Thread class (it's own super class) and complain.
Any suggestions?
Code:
public class TopClass
public void doSomething(){
// do something
=============================
public class LowerClass extends TopClass
// overrides TopClass's doSomething.
public void doSomething(){
// do something
public void testThread(){
Thread t = new Thread(){
public void run(){
doSomething(); //fine
super.doSomething(); //WRONG: searches class Thread for doSomething...
t.start();
}Classes frequently call the un-overridden versions of methods from their superclasses. That's that the super keyword is for, if I'm not mistaken.You're not mistaken about the keyword, but you're not calling the superclass method from a subclass. Your anonymous inner class is not a subtype of TopLevel. It's a subtype of Thread.
Here it is no different, except that I happen to be in a thread at the time.It's vastly different, since you're attempting to call the method from an unrelated class; i.e., Thread.
I could also be in a button's action listener, for example. It seems natural to me that if I can do it in a method, I should be able to do it within an anonymous inner class which is inside a method.If you were in an button's action listener and needed to call a superclass' implementation of a method overridden in the button, I'd have the same questions about your design. It seems smelly to me.
~ -
How is super class's method called?
I'm having some doubt about Item 15 in Effective Java, "Design and document for inheritance or else prohibit it".
The author says if a class is intended to be inherited, then its constructor must not invoke any overridable methods. He gives the following example code. The result of running proves the author's word: The first line is null, and then the second line is a date.
My question is why Super's constructor calls Sub's version of m, but not its own? Can anyone give me some explanation?
import java.util.*;
class Super {
// Broken - constructor invokes overridable method
public Super() {
m();
public void m() {
public final class Sub extends Super {
private final Date date; // Blank final, set by constructor
Sub() {
date = new Date();
// Overrides Super.m, invoked by the constructor Super()
public void m() {
System.out.println(date);
public static void main(String[] args) {
Sub s = new Sub();
s.m();
}First up, it's handy (good practice?) to include
calls to super() in your constructors as an explicit
reminder as to the order that they'll be executed,
e.g.
Sub() {
super();
date = new Date();
}This makes it clear that the superclass's
constructor will be executed before date is
initialised.
Now to your question: a subclass and a superclass
form a single whole object; the subclass doesn't 'sit
on top' of the superclass, as it were. Because the
subclass, Sub, overrides the superclass's
implementation of method m, its implementation will
always be invoked. Only Sub.m can call its
super implementation (i.e. super.m()); So, for
example, even this would call Sub's implementation of
method m:Super a = new Sub();
a.m(); // will invoke Sub.m(), not Super.m()!
Thank everybody for all the replies.
Super a = new Sub();
a.m(); // will invoke Sub.m(), not Super.m()!This is easy to understand. although a is of type Spuer, it's an instance of Sub, so the runtime will decide to invoke Sub's implemention. This is right where Polymorphism comes.
So it can go a step further, when an instance is being constructed, an instance of Super never exists, and there is only one instance, it's a Sub instance. So, although the m method is invoked by the Super constructor, which version is invoked is chosen by the instance. -
How to get the methods of current class and its super class using reflection. The retrieved methods should be only the methods of user-defined classes but not methods of Java APIs such as Object or any other class provided in JDK.
For ex, If Class B is inheriting Class A, i need the methods which are declared only in A & B but not from the Object Class. Similarly, If class C is extending any JDK API such as Thread, I need only the methods declared in class C.thanku very much for the answer.
I am trying to execute the methods of another class using reflection. So I have to consider the inherited methods also. For that, I have to differentiate between standard classes & user-defined classes.Assume that u have one GUI screen where in once u select a class all its methods including inherited methods have to be displayed.
I can get the the superclass using the method getSuperClass(). But inorder to get the protected methods of superclass what is the method to be used ? If I use getMethods(), it returns only public methods, where as getDeclaredMethods() returns all the methods. Since I have to execute only public & protected methods, what is the best way to solve this ? -
Can we chagne Super class method parameters in Sub class
Hi,
I created a super class. In that class i created a method. That method is having 4 input parameters and 4 export parameters.
I created a sub class for that super class. I need to use only 2 input parameters in this class rather than 4 parameters. I want to delete 2 Input parameters in the sub class of the super class method. Is it possible.
If possible. can we give an simple code or pseudo code?
regards,
krishnaHi,
I think you can not.
Because, only public attributes can be inherited and they will remain public in the subclass.
for further detail check,
http://help.sap.com/saphelp_nw70/helpdata/en/1d/df5f57127111d3b9390000e8353423/content.htm
regards,
Anirban
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