Implement method inside abstract class?

hello everyone:
I have a question regarding implementation of method inside a abstract class. The abstract class has a static method to swamp two numbers.
The problem ask if there is any output from the program; if no output explain why?
This is a quiz question I took from a java class. I tried the best to recollect the code sample from my memory.
if the code segment doesn't make sense, could you list several cases that meet the purpose of the question. I appreciate your help!
code sample
public abstract class SwampNumber
   int a = 4;
   int b = 2;
   System.out.println(a);
   System.out.println(b);
   swamp(a, b);
   public static void swamp(int a, int b)
     int temp = a;
         a = b;
         b = a;
     System.out.println(a);
     System.out.println(b);

It won't compile.
You can't instantiate an abstract class before you know anything.
//somewhere in main
SwampNumber myNum = new SwampNumber();
//Syntax ErrorQuote DrClap
This error commonly occurs when you have code that >>is not inside a method.
The only statements that can appear outside methods >>in a Java class are >>declarations.Message was edited by:
lethalwire

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Java needs to find your functions in the DLL or SO. But the names are "mangled" if you declare the function inside a class - even declaring the function "static" does not help. For instance, using the Microsoft C++ compiler:
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Hi,
What is the purpose of Static methods inside a class?
I want the answers apart from "A static method does not require instance of class(to access) and it can directly be accessed by the class name itself"
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Unlike attributes, a separate copy of instance attributes will be created for each instance of a class where as only one copy of static attributes will be created for all instances.
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Hi Sharma,
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Take a look at this wiki pages.
[https://wiki.sdn.sap.com/wiki/x/o5k]
[https://wiki.sdn.sap.com/wiki/x/ZtM]
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I really need abstract static methods in abstract class

Hello all.. I have a problem,
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Or can someone else explain me how to do this without abstract static methods:
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static Y getY() { return YofC; }
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A.getX();I know this wont compile. How should i do it to implement the same?

Damn i posted this in the wrong thread.. anyways.
Yes offcourse i understand abstract and static
But i have a problem where the only solution is to use them both.
I think it is theoretically possible ot implement a JVM with support for abstract static methods.
In fact it is a design decision to not support abstract static methods.. thats why i am asking this question.. how could you implemented this otherwise?
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Dynamically invoke methods of abstract class?

Hi,
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(a) invoke the methods that are already implemented in ClassB;
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Ok, the program is quite long, as it does other things as well, so I'll just put in the relevant bits.
What I have is a JTree that displays classes selected by the user from a JFileChooser, and their methods.
// I declare a variable called executeMethod
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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"); }
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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:
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protected abstract void do();
protected abstract void now();
} // end First*******
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public class Second extends my.one.First {
protected void do() { System.out.println("Second does"); }
protected void now() { System.out.println("Second does now"); }
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package my.three;
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} // 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

Can i call non -abstract method in abstract class into a derived class?

Hi all,
Is it possible in java to call a non-abstract method in a abstact class from a class derived from it or this is not possible in java.
The following example will explain this Ques. in detail.
abstract class A
void amethod()
System.out.println(" I am in Base Class");
public class B extends A
void amethod()
System.out.println(" I am in Derived Class");
public static void main (String args[])
// How i code this part to call a method amathod() which will print "I am in Base Class
}

Ok, if you want to call a non-static method from a
static method, then you have to provide an object. In
this case it does not matter whether the method is in
an abstract base class or whatever. You simply cannot
(in any object oriented language, including C++ and
JAVA) call a nonstatic method without providing an
object, on which you will call the method.
To my solution with reflection: It also only works,
if you have an object. And: if you use
getDeclaredMethod, then invoke should not call B's
method, but A's. if you would use getMethod, then the
Method object returned would reflect to B's method.
The process of resolving overloaded methods is
performed during the getMethod call, not during the
invoke (at least AFAIK, please tell me, if I'm wrong).You are wrong....
class A {
    public void dummy() {
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class B extends A {
     public void dummy() {
          System.out.println("Dymmy in B");
     public static void main(String[] args) throws Exception {
          A tmp = new B();
          Class clazz = A.class;
          Method method = clazz.getDeclaredMethod("dummy", null);
          method.invoke(tmp, null);
}Prints:
Dymmy in B
/Kaj

CRM 7.0 implement method from MVC class

Hello, folks. I will prefix my question with the fact that I am a relative dinosaur in the development arena, still focused primarily procedural coding practices. Although this still serves me well, it also means that I know little about OO development. I have had some training and can make use of such common tools as OO ALV. However, I know next to nothing about MVC (model view controller) programming, WEB Dynpro for ABAP, etc. I am currently assigned to a CRM project (I am also new to CRM) and have a particular requirement that I cannot seem to address with any sort of procedural-based solution (i.e. function module).
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Hi there,
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Cheers
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Using common methods with abstract classes

hello everyone, i wanted to know if it is bad practice (i imagine it is) to place methods which will be used by multiple classes (computational methods) in an abstract class and mark them as static. When i do this they are always project wide utility classes which dont need an instantiation. When using any of these methods which are common to a project i can then just use..
Type result = ClassName.DoStaticMethod(...);Thanks for any input,
Dori
Edited by: Sir_Dori on Dec 8, 2008 2:01 AM

Depends on what the methods are meant to do, but I wouldn't make the class abstract. I would instead declare it to be final and have a private constructor.
Kaj
Ps. Take a look at the java.lang.Match class.

Implementing methods in a class

I have a class called Employee that uses getters and seters and methods from another project. I brought the code from the methods into the Employee class to run them in my class. It is supose to calculate an employee's monthly income plus commission and a seniority bonus based on years. When I compile the class I get errors. I was wondering if you java experts can look and see what my problem is. Here is the code and errors, thanks...
public class Employee
     private String firstName, lastName,
          address, city, state,zipCode;
     private short seniority = 0;
     private double baseSalary = 500;
     private Company company;
     //constructor
     public Employee(String fn, String ln, String a, String c, String s,
          String zc, short newSeniority, double newBs, Company newCompany){
          firstName = fn;
          lastName = ln;
          address = a;
          city = c;
          state = s;
          zipCode = zc;
          seniority = newSeniority;
          baseSalary = newBs;
          company = newCompany;
     public Employee(){
          firstName = "";
          lastName = "";
          address = "";
          city = "";
          state = "";
          zipCode = "";
     public double computeCommision(double weeklyPay) {
          double thisCommission;
       if(weeklyPay < baseSalary)
              thisCommission = 0.00;
       else if(weeklyPay < 1000.00)
          thisCommission = weeklyPay * .05;
       else if(weeklyPay < 5000.00)
          thisCommission = weeklyPay * .08;
       else if(weeklyPay >= 5000.00)
          thisCommission = weeklyPay * .10 + 400;
       else thisCommission = 0.00;
       return thisCommission;
     public double bonus(double weeklyPay, int yearsWorked) {
          short seniority;
        double thisCommission = computeCommission(weeklyPay);
        if (yearsWorked >= 2) // No bonus for less than two years
             seniority = (weeklyPay * yearsWorked)/100;
        return seniority;
     public double payroll() {
          double payroll = 0.0, pay, commission, bonus, years;
        System.out.println("\nPlease enter the years you have worked for this company:");
        int response = MyInput.readInt();
        for (int i = 0; i < 4; i++)
        System.out.println("\nPlease enter you salary for week " + (i+1) + ": ");
        pay = MyInput.readDouble();
        commission = computeCommission(pay);
        bonus = bonus((commission + pay), response);
        payroll = payroll + pay + commission + bonus;
        return payroll;
     public String getFirstName() { return firstName; }
     public void setFirstName(String fn) { firstName = fn; }
     public String getLastName() { return lastName; }
     public void setLastName(String ln) { lastName = ln; }
     public String getAddress() { return address; }
     public void setAddress(String a) { address = a; }
     public String getCity() { return city; }
     public void setCity(String c) { city = c; }
     public String getState() { return state; }
     public void setState(String s)     { state = s; }
     public String getZipCode()     { return zipCode; }
     public void setZipCode(String zc) { zipCode = zc; }
     public short getSeniority() { return seniority; }
     public void setSeniority(short newSeniority) { seniority = newSeniority; }
     public double getBaseSalary() { return baseSalary; }
     public void setBaseSalary(double newBs) { baseSalary = newBs; }
     public Company getCompany() { return company; } //getter method for company in company class
     public void setBank(Company newCompany) { company = newCompany; }
}   and the errors are :
C:\cis163\Project5_1\src\Employee.java:59: cannot resolve symbol
symbol : method computeCommission (double)
location: class Employee
double thisCommission = computeCommission(weeklyPay);
^
C:\cis163\Project5_1\src\Employee.java:62: possible loss of precision
found : double
required: short
seniority = (weeklyPay * yearsWorked)/100;
^
C:\cis163\Project5_1\src\Employee.java:70: cannot resolve symbol
symbol : variable MyInput
location: class Employee
int response = MyInput.readInt();
^
C:\cis163\Project5_1\src\Employee.java:75: cannot resolve symbol
symbol : variable MyInput
location: class Employee
pay = MyInput.readDouble();
^
C:\cis163\Project5_1\src\Employee.java:76: cannot resolve symbol
symbol : method computeCommission (double)
location: class Employee
commission = computeCommission(pay);
^
5 errors

ok, sorry. I wasnt clear on what you were saying. MyInput.java is in the same folder when I compiled it. I changed my code around a little, changed some variables so it was easier for me to understand. I am still getting several errors after I wrote code for the Project which I called project5. Not sure where I am going wrong but I will post my classes and main to see if anyone can help me out.
//Company class
public class Company
    private String companyName;
     private String companyAddress;
     private String companyCity;
     private String companyState;
     private String companyZip ;
     //Constructor method
     public Company(String cn, String ca, String cc, String cs, String cz) {
          companyName = cn;
          companyAddress = ca;
          companyCity = cc;
          companyState = cs;
          companyZip = cz;
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         companyName = "";
         companyAddress = "";
         companyCity = "";
         companyState = "";
         companyZip = "";
     public String getName() { return companyName; }
    public void setName(String cn) { companyName = cn; }
     public String getAddress() { return companyAddress; }
    public void setAddress(String ca){ companyAddress = ca; }
    public String getCity() { return companyCity; }
    public void setCity(String cc) { companyCity = cc; }
    public String getState() { return companyState; }
    public void setState(String cs) { companyState = cs; }
    public String getZip()     { return companyZip; }
    public void setZip(String cz) { companyZip = cz; }
//Employee class
public class Employee
     private String employeeFName, employeeLName,employeeAddress,
          employeeCity, employeeState, employeeZip;
     private short seniority = 0;
     private double baseSalary = 500;
     private Company company;
     //constructor
     public Employee(String efn, String eln, String ea, String ec, String es,
          String ez, short newSeniority, double newBs, Company newCompany){
          employeeFName = efn;
          employeeLName = eln;
          employeeAddress = ea;
          employeeCity = ec;
          employeeState = es;
          employeeZip = ez;
          seniority = newSeniority;
          baseSalary = newBs;
          company = newCompany;
     public Employee(){
          employeeFName = "";
          employeeLName = "";
          employeeAddress = "";
          employeeCity = "";
          employeeState = "";
          employeeZip = "";
     public double computeCommission(double weeklyPay) {
          double thisCommission;
       if(weeklyPay < baseSalary)
              thisCommission = 0.00;
       else if(weeklyPay < 1000.00)
          thisCommission = weeklyPay * .05;
       else if(weeklyPay < 5000.00)
          thisCommission = weeklyPay * .08;
       else if(weeklyPay >= 5000.00)
          thisCommission = weeklyPay * .10 + 400;
       else thisCommission = 0.00;
       return thisCommission;
     public double bonus(double weeklyPay, int yearsWorked) {
          short seniority;
        double thisCommission = computeCommission(weeklyPay);
        if (yearsWorked >= 2) // No bonus for less than two years
             seniority = (short) ((weeklyPay * yearsWorked)/100);
        return seniority;
     public double payroll() {
          double payroll = 0.0, pay, commission, bonus, years;
        System.out.println("\nPlease enter the years you have worked for this company:");
        int response = MyInput.readInt();
        for (int i = 0; i < 4; i++)
        System.out.println("\nPlease enter you salary for week " + (i+1) + ": ");
        pay = MyInput.readDouble();
        commission = computeCommission(pay);
        bonus = bonus((commission + pay), response);
        payroll = payroll + pay + commission + bonus;
        return payroll;
     public String getFirstName() { return employeeFName; }
     public void setFirstName(String efn) { employeeFName = efn; }
     public String getLastName() { return employeeLName; }
     public void setLastName(String eln) { employeeLName = eln; }
     public String getAddress() { return employeeAddress; }
     public void setAddress(String ea) { employeeAddress = ea; }
     public String getCity() { return employeeCity; }
     public void setCity(String ec) { employeeCity = ec; }
     public String getState() { return employeeState; }
     public void setState(String es)     { employeeState = es; }
     public String getZipCode()     { return employeeZip; }
     public void setZipCode(String ez) { employeeZip = ez; }
     public short getSeniority() { return seniority; }
     public void setSeniority(short newSeniority) { seniority = newSeniority; }
     public double getBaseSalary() { return baseSalary; }
     public void setBaseSalary(double newBs) { baseSalary = newBs; }
     public Company getCompany() { return company; } //getter method for company in company class
     public void setBank(Company newCompany) { company = newCompany; }
public class Project5 { //Beginning of class Project5
public static void main (String args[]) { //Beginning of main
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        String companyName = "";
        String companyAddress = "";
        String companyCity = "";
        String companyState = "";
        String companyZip = "";
        // Creates a new Company object called aCompany
        Company aCompany = new Company( companyName, companyAddress,
             companyCity, companyState, companyZip );
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        // and sets fields for the Company object.
        System.out.println( "***Company Information***" );
        System.out.println( "Please enter information about company:");
        System.out.println();
        System.out.print( "Company name: " );
        companyName = MyInput.readString();
        aCompany.setName( companyName );
        System.out.print( "Company address: " );
        companyAddress = MyInput.readString();
        aCompany.setAddress( companyAddress );
        System.out.print( "Company city: " );
        companyCity = MyInput.readString();
        aCompany.setCity( companyCity );
        System.out.print( "Company state: " );
        companyState = MyInput.readString();
        aCompany.setState( companyState );
        System.out.print( "Company zip: " );
        companyZip = MyInput.readString();
        aCompany.setZip( companyZip );
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        String employeeLName = "";
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        System.out.println( "Please enter information about an employee:");
        System.out.println();
        System.out.print( "Employee first name: " );
        employeeFName = MyInput.readString();
        anEmployee.setFirstName( employeeFName );
        System.out.print( "Employee last name: " );
        employeeLName = MyInput.readString();
        anEmployee.setLastName( employeeLName );
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        employeeAddress = MyInput.readString();
        anEmployee.setAddress( employeeAddress );
        System.out.print( "Employee city: " );
        employeeCity = MyInput.readString();
        anEmployee.setCity( employeeCity );
        System.out.print( "Employee state: " );
        employeeState = MyInput.readString();
        anEmployee.setState( employeeState );
        System.out.print( "Employee zip: " );
        employeeZip = MyInput.readString();
        anEmployee.setZip( employeeZip );
        System.out.print( "How many years the employee has been with the company? : " );
        seniority = (short)MyInput.readInt();
        anEmployee.setSeniority( seniority );
        System.out.println();
        // Displays company information
        System.out.println( "*** Company Information Summary ***" );
        System.out.println( "Company name:    " + aCompany.getName());
        System.out.println( "Company address: " + aCompany.getAddress() );
        System.out.println( "Company city:    " + aCompany.getCity() );
        System.out.println( "Company state:   " + aCompany.getState() );
        System.out.println( "Company zip:     " + aCompany.getZip() );
        System.out.println();
        // Displays employee information
        System.out.println( "*** Employee Information Summary ***");
        System.out.println( "Employee firstName: " + anEmployee.getFirstName() );
        System.out.println( "Employee lastName:   " + anEmployee.getLastName() );
        System.out.println( "Employee seniority: " + anEmployee.getSeniority() );
        System.out.println( "Employee baseSalary: $" + anEmployee.getBaseSalary() );
        System.out.println( "Employee address:    " + anEmployee.getAddress() );
        System.out.println( "Employee city:       " + anEmployee.getCity() );
        System.out.println( "Employee state:      " + anEmployee.getState() );
        System.out.println( "Employee zip:        " + anEmployee.getZip() );
        // We retrieve the company name from anEmployee object.
        System.out.println( "Company name the employee works for: "
             + anEmployee.getCompany().getName() );
        // Calls payroll() to calculate one month salary
        System.out.println();
        System.out.println( "*** Calculate monthly pay *** " );
        double oneMonthSalary = anEmployee.payroll(); // Calls payroll()
        DecimalFormat myDecimalFormat = new DecimalFormat( "0.00" );
// Instantiate DecimalFormat object
        // Format one month salary and display to console
        System.out.println();
        System.out.println( "One month salary is: $" + myDecimalFormat.format(oneMonthSalary) );
        System.out.println();
}sorry, its alot. I'm getting 18 errors, which are:
C:\cis163\Project5_1\src\Project5.java:24: cannot resolve symbol
symbol : variable MyInput
location: class Project5
companyName = MyInput.readString();
^
C:\cis163\Project5_1\src\Project5.java:28: cannot resolve symbol
symbol : variable MyInput
location: class Project5
companyAddress = MyInput.readString();
^
C:\cis163\Project5_1\src\Project5.java:32: cannot resolve symbol
symbol : variable MyInput
location: class Project5
companyCity = MyInput.readString();
^
C:\cis163\Project5_1\src\Project5.java:36: cannot resolve symbol
symbol : variable MyInput
location: class Project5
companyState = MyInput.readString();
^
C:\cis163\Project5_1\src\Project5.java:40: cannot resolve symbol
symbol : variable MyInput
location: class Project5
companyZip = MyInput.readString();
^
C:\cis163\Project5_1\src\Project5.java:56: cannot resolve symbol
symbol : constructor Employee (java.lang.String,java.lang.String,short,java.lang.String,java.lang.String,java.lang.String,java.lang.String,Company)
location: class Employee
Employee anEmployee = new Employee( employeeFName,employeeLName, seniority,
^
C:\cis163\Project5_1\src\Project5.java:66: cannot resolve symbol
symbol : variable MyInput
location: class Project5
employeeFName = MyInput.readString();
^
C:\cis163\Project5_1\src\Project5.java:70: cannot resolve symbol
symbol : variable MyInput
location: class Project5
employeeLName = MyInput.readString();
^
C:\cis163\Project5_1\src\Project5.java:74: cannot resolve symbol
symbol : variable MyInput
location: class Project5
employeeAddress = MyInput.readString();
^
C:\cis163\Project5_1\src\Project5.java:78: cannot resolve symbol
symbol : variable MyInput
location: class Project5
employeeCity = MyInput.readString();
^
C:\cis163\Project5_1\src\Project5.java:82: cannot resolve symbol
symbol : variable MyInput
location: class Project5
employeeState = MyInput.readString();
^
C:\cis163\Project5_1\src\Project5.java:86: cannot resolve symbol
symbol : variable MyInput
location: class Project5
employeeZip = MyInput.readString();
^
C:\cis163\Project5_1\src\Project5.java:87: cannot resolve symbol
symbol : method setZip (java.lang.String)
location: class Employee
anEmployee.setZip( employeeZip );
^
C:\cis163\Project5_1\src\Project5.java:90: cannot resolve symbol
symbol : variable MyInput
location: class Project5
seniority = (short)MyInput.readInt();
^
C:\cis163\Project5_1\src\Project5.java:114: cannot resolve symbol
symbol : method getZip ()
location: class Employee
System.out.println( "Employee zip: " + anEmployee.getZip() );
^
C:\cis163\Project5_1\src\Project5.java:127: cannot resolve symbol
symbol : method payroll ()
location: class Employee
double oneMonthSalary = anEmployee.payroll(); // Calls payroll()
^
C:\cis163\Project5_1\src\Project5.java:129: cannot resolve symbol
symbol : class DecimalFormat
location: class Project5
DecimalFormat myDecimalFormat = new DecimalFormat( "0.00" );
^
C:\cis163\Project5_1\src\Project5.java:129: cannot resolve symbol
symbol : class DecimalFormat
location: class Project5
DecimalFormat myDecimalFormat = new DecimalFormat( "0.00" );
^
18 errors

Problem implementing Methods in a class

Hi,
I am trying to change this code :
import java.util.Scanner;
public class Test {
public static void main(String[]args) {
Scanner stdin = new Scanner(System.in);
System.out.print("Number: ");
double n = stdin.nextDouble();
System.out.println(n + " * " + n + " = " + n*n);
So that instead of everytime that I get in I have to create an a new state,
I want to create it an object that could be access for every class
and I did this but is not running:
import java.util.Scanner;
public class Miguel {
public static void main(String[]args) {
public double calc(double n)
Scanner stdin = new Scanner(System.in);
System.out.print("Number: ");
double n = stdin.nextDouble();
System.out.println(n + " * " + n + " = " + n*n);
return n
System.out.println(calc());
}

and I did this but is not running:Not only that, it's not compiling. You can't declare methods within methods, as you have done by attempting to declare calc() inside of main().
When you post code, please post it between [code] and [/code] tags (you can just use the "code" button on the message posting screen). It makes your code much easier to read by preserving the original spacing, adding syntax highliting, and it prevents accidental markup from array indices like [i].

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I developed a custom class that contained a private method. I removed this method because it was no longer needed. When moving the changes from the development to test client, it failed on import. For some reason, there was still some dependency on the method that was deleted.
I went back to transaction SE24 and regenerated all the sections. When this was done, it regenerated the class definition and the various sections. I moved a transport that contained these changes and it still failed. The import log has a reference to an include that is failing, but I still see no mention of the method that was deleted.
To continue going forward, I added the method back so that it resolved syntax error during import.
I am suspecting that there is some issue with ABAP support pack being used on the development system. Have other people experienced the same issue. I don't have the habit of deleting that many methods once it is created, but would like to understand the above problem and see what should be the corrective action.
Feedback/comments would be appreciated.
Regards,
Vince Castello

As mentioned in my original post, I did re-generate all the sections using SE24, but the import still failed where the dependency to deleted method still remained.
I am planning to create a customer message and will post results when they become available.
Regards,
Vince Castello

Implementation method SEARCH_FOR_NEXT_PROCESSOR of Class PT_GEN_REQ

Hi All,
we are trying to implement BADI u201CFind next processoru201D of the implementation PT_GEN_REQ and we would like to filter the next processor according to the absence/attendance type which is not one of parameters of the method SEARCH_FOR_NEXT_PROCESSOR.
Is there a way to do so?
Thanks in advace for your help,
Amedeo

Hi Harald,
to check the user defined entries, I suggest you implement it in the START_WF method. There's a method call:
    CALL METHOD lc_step->agent_append
      EXPORTING
        agent          = l_agent
      EXCEPTIONS
        already_exists = 1
        locked         = 2
        OTHERS         = 3.
which adds the agents to the recipient list. The validation could be put before this I think.
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Mikko

Non-abstract methods in a Abstract class

Abstract Class can contain Non-abstract methods.
and Abstract Classes are not instantiable as well
So,
What is the purpose of Non-abstract methods in a Abstract class.
since we can't create objects and use it
so these non-abstract methods are only available to subclasses.
(if the subclass is not marked as abstract)
is that the advantage that has.(availability in subclass)
??

For example, the AbstractCollection class (in
java.util) provides an implementation for many of the
methods defined in the Collection interface.
Subclasses only have to implement a few more methods
to fulfill the Collection contract. Subclasses may
also choose to override the AbstractCollection
functionality if - for example - they know how to
provide an optimized implementation based on
characteristics of the actual subclass.Another example is the abstract class MouseAdapter that implements MouseListener, MouseWheelListener, MouseMotionListener, and that you can use instead of these interfaces when you want to react to one or two types of events only.
Quoting the javadocs: "If you implement the MouseListener, MouseMotionListener interface, you have to define all of the methods in it. This abstract class defines null methods for them all, so you can only have to define methods for events you care about."

Implement method inside abstract class?

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