Creating class & methods

Hello all,
How to create a class..
Please send me the sample steps.

hi,
We can create class by using these simple steps.
class has declaration step, in this we can define call componets like
methods, attributes,evnts..
*local class creation
CLASS <class> DEFINITION.
METHOD <meth>. "for defining methods.
ENDMETHOD.
ENDCLASS.
class has implementation section, in this section we can provide implementations to all the definitions which are declared in class declaration section.
CLASS <class> IMPLEMENTATION.
ENDCLASS.
simple example;
CLASS C_COUNTER DEFINITION.
PUBLIC SECTION. " here declare public components
 METHODS: SET_COUNTER IMPORTING VALUE(SET_VALUE) TYPE I,
 INCREMENT_COUNTER,
 GET_COUNTER EXPORTING VALUE(GET_VALUE) TYPE I.
PRIVATE SECTION. "here declare local components
 DATA COUNT TYPE I.
ENDCLASS.
CLASS C_COUNTER IMPLEMENTATION.
METHOD SET_COUNTER. " method implemetation
 COUNT = SET_VALUE.
ENDMETHOD.
METHOD INCREMENT_COUNTER.
 ADD 1 TO COUNT.
ENDMETHOD.
METHOD GET_COUNTER.
 GET_VALUE = COUNT.
ENDMETHOD.
ENDCLASS.
Follow these steps to declare object to class.
data: obj type ref to <name of the class>. "here refarence variable is created
 CREATE OBJECT obj. "here object is created
*global class creation
we can create global class in CLASS BUILDER, for that one we work with SE24.
follow this link for class builder.
http://help.sap.com/saphelp_nw2004s/helpdata/en/ee/e440a670a111d1b44c0000e8a52bed/content.htm
follow this link for knowing types of classes and types of class components.
http://www.erpgenie.com/abap/OO/syntax.htm
http://help.sap.com/saphelp_nw04/helpdata/en/b3/f4b1406fecef0fe10000000a1550b0/content.htm
regards,
Ashokreddy.

Similar Messages

Class methods

Hi,
When you create class methods they usually fall into 2 types accessors and mutators. This is fine if your methods are accessing data within the class or modifiying data within the class. So my question is this what do you call methods that do not access or modify the class?
For example:
private void myMethod()
System.out.println("What type of method is this?");
Many Thanks

To my mind, a "class method" is one associated with the class as opposed to an instance. So a method that's not a class method is an instance method. A class method is declared with the "static" modifier, then.
I get the impression though that that's not what you're asking at all.
I'd call the method in your example "an instance method that doesn't change state and is called for its side effects."

Help with creating a method within a class

I need help creating another method within the same class.
Here is part of my progam, and could anyone help me convert the switch statement into a seperate
method within the same class?
import javax.swing.JOptionPane;
public class Yahtzee
 public static void main (String[] args)
 String numStr, playerStr, str, tobenamed;
 int num, times = 13, roll, x, y, maxRoll = 3, z = 0, t;
 int firstDie, secondDie, thirdDie, fourthDie, fifthDie, maxDie = 5, reroll;
 int rerolling = 0, categoryChoice, score, nextDie1, nextDie2, nextDie3, nextDie4;
 Die die1, die2, die3, die4, die5;
 do
 numStr = JOptionPane.showInputDialog ("Enter the number of player: ");
 num = Integer.parseInt(numStr);
 while (num < 1 || num > 6); //end of do loop
 String [] player = new String[num];
 // boolean //finsih later to make category choice only once.
 for (x = 0; x < num; x++)
 playerStr = JOptionPane.showInputDialog ("Name of Player" + (x + 1) + " :");
 player[x] = playerStr;
 } //end of for loop
 die1 = new Die();
 die2 = new Die();
 die3 = new Die();
 die4 = new Die();
 die5 = new Die();
 int scoring [][] = new int [num][13];//scoring aray
 int[] numDie = new int[maxDie];
 String[][] usedCategory = new String [num][times];
 for (x=0; x < 13; x++)
 for (y = 0; y < num; y++)
 usedCategory[y][x] = " ";
 for (int choices = 0; choices < times; choices++)
 //player turns for loop.
 for (x = 0; x < num; x++)
 //rolls the die;
 for (y = 0; y < maxDie; y++)
 numDie[y] = die1.roll();
 numStr = JOptionPane.showInputDialog (player[x] + "\n~~~~~~~~~~~~~~~~~~~~~~~"
 + "\nDie1: " + numDie[0]
 + "\nDie2: " + numDie[1]
 + "\nDie3: " + numDie[2]
 + "\nDie4: " + numDie[3]
 + "\nDie5: " + numDie[4]
 + "\nWhich dice do you want to reroll");
 reroll = numStr.length();
 if (reroll == 0)
 t = maxRoll;
 else{
 //reroll
 for(t = 0; t < maxRoll; t++ )
 for (y = 0; y < reroll; y++)
 rerolling = numStr.charAt(y);
 //create another mwthod later.
 switch (rerolling)
 case '1':
 numDie[0] = die1.roll();
 break;
 case '2':
 numDie[1] = die1.roll();
 break;
 case '3':
 numDie[2] = die1.roll();
 break;
 case '4':
 numDie[3] = die1.roll();
 break;
 case '5':
 numDie[4] = die1.roll();
 break;
 default:
 t = maxRoll;//to be changed
 } //end of switch class
 }//end of reroll for loop
 JOptionPane.showMessegeDialog (player[x] + "\n~~~~~~~~~~~~~~~~~~~~~~~"
 + "\nDie1: " + numDie[0]
 + "\nDie2: " + numDie[1]
 + "\nDie3: " + numDie[2]
 + "\nDie4: " + numDie[3]
 + "\nDie5: " + numDie[4]
 + "\nWhich dice do you want to reroll"
 switch (rerolling)
 case '1':
 numDie[0] = die1.roll();
 break;
 case '2':
 numDie[1] = die1.roll();
 break;
 case '3':
 numDie[2] = die1.roll();
 break;
 case '4':
 numDie[3] = die1.roll();
 break;
 case '5':
 numDie[4] = die1.roll();
 break;
 default:
 t = maxRoll; //not really anything yet, or is it?
 } //end of rerolling switch class
 //categorychoice = Integer.parseInt(category);
 }//end of t for loop
 }//end of player for loop.

samuraiexe wrote:
well, i should have said it is a yahtzee program, and i ask the user what they want to reroll and whatever number they press, the switch will activate the case and the array that it will reroll.
HOw would i pass it as an argument?You put it in the argument list. Modifying your original code a bit:
public static void switchReroll (int[] dice, int position) {
 switch (position) {
 case '1':
 dice[0] = die1.roll()
 break;
 case '2':
 dice[1] = die1.roll();
 break;
 case '3':
 dice[2] = die1.roll();
 break;
 case '4':
 dice[3] = die1.roll();
 break;
 case '5':
 dice[4] = die1.roll();
 break;
 default:
 t = maxRoll;//to be changed
 } //end of switch
}which you could then call as this:
switchReroll(numDie, reroll);Note that your code still isn't done; the above won't compile. This is just an example of how you could pass the stuff as an argument (and note how the values have different names in the main method than in the switchReroll method -- this works, but also note that it's the same array of ints in both).
By the way -- you really don't need a switch statement for this. You can do the same thing with a couple lines of code, which would lessen the advantage for a separate method. But I'd suggest continuing down this path, and then you could change the implementation of the method later.

Case Management - Create a Case using FM or Class-Method

Hi all,
I am involved in a Case Management project now.
I have a requeirment where I have to create a Case using a Function Module or a Method of a class.
Does anybody knowhow to do this?
Thanks and kind regards,
Guillermo

Hi,
Can you try the following BAPI - BAPI_CRMCASE_CREATE from the Function Group - CRM_CMG_BAPI. I guess this will at least give you some idea as to how to proceed. Also, have a look at the Function Module documentation which will give you an idea of the sample code.
You can also have a look at the following Class Method - cl_crm_cmg_manager=>create_case. I found this in CL_CRM_CMG_IL which is the SAP CRM 6.0 Genil Component Class.
I hope this will help.
Thanks and Regards,
Samantak.
Edited by: Samantak Chatterjee on Oct 26, 2010 4:03 PM

How to keep track of all the classes/methods/properties created in a long script

Hi,
I'm curious to know what method people use to keep track of all the classes, methods, and properties you've created when writing a longer script.
For quick scripts, this isn't a problem. But for long scripts it can get quite difficult to keep track of all the objects one has created, and all their methods and properties, and overloaded constructors, etc.
ESTK is great, and it's the IDE I use for InDesign scripting, if only because of it's powerful debugging options.
But it doesn't provide any way of keeping track of this stuff. No proper Intellisense as in Visual Studio.
I'd be interested to hear how people solve this issue.

Hi Ariel,
Not sure it is relevant to your question but I have an old snippet that collects and displays ExtendScript references using $.list(). This may help to track some object relationships.
// WARNING: this is just a WIP -- Not tested in all platforms and versions
$.scanRefs = function scanRefs(/*0|1*/showAll)
 var s = $.list(),
 p = (!showAll) && s.indexOf('[toplevel]'),
 a = ((!showAll) ? s.substr(0,10+p) : s).split(/[\r\n]+/),
 n = a.length,
 // --- Address:1 L:2 Rf:3 Pp:4 Type:5 Name:6
 re = /^([0-9a-z]{8}) (.) +(\d+) +(\d+) (.{10}) (.{1,17})/,
 reTrim = / +$/,
 i, t, k, m,
 refBy, type, name, tag, rest, rfCount, props, j,
 o = {},
 TYPES = {'Function':"FCT", 'Object':"OBJ", 'Array':"ARR", 'RegExp':"REG"};
 for( i=2, refBy=0 ; i < n ; ++i )
 s=a[i];
 while( s && m=s.match(re) )
 k = '&'+m[1].toUpperCase();
 rfCount = parseInt(m[4],10);
 rest = s.substr(m[0].length);
 type = m[5].replace(reTrim,'');
 name = m[6].replace(reTrim,'');
 if( 0x5B==rest.charCodeAt(0) )
 p = rest.indexOf(']');
 tag = rest.substr(0,1+p);
 rest = rest.substr(1+p);
 else
 tag = '';
 if( 0x20==rest.charCodeAt(0) )
 rest=rest.substr(1);
 if( p=!(rest.indexOf("referenced by:")) )
 rest = rest.substr(14);
 o[k] || (o[k] = {
 locked: +('L'==m[2]),
 rfCount: parseInt(m[3],10),
 ppCount: rfCount,
 type: TYPES[type]||type,
 name: name,
 tag: tag,
 from: [],
 order: -1,
 if( 0 < refBy )
 if( p || !rest ){ throw "Unable to parse references." }
 props = rest.split(' ');
 refBy -= (j=props.length);
 while( j-- ) t.from.push([k,props[j]]);
 (props.length=0)||(props=null);
 rest = '';
 else
 refBy = rfCount;
 if( p != !!refBy )
 if( p ){ throw "Unable to parse references."; }
 refBy = 0;
 (t = o[k]).order = n - i;
 (m.length=0)||(m=null);
 s = rest;
 a.length=i=0;
 for( k in o )
 if( !o.hasOwnProperty(k) ) continue;
 a[i++] = k;
 a.sort( function(x,y){return o[x].order-o[y].order;} );
 //a.sort( function(x,y){return parseInt(x.substr(1),16)-parseInt(y.substr(1),16);} );
 var u,
 pngLock = "\x89PNG\r\n\x1A\n\x00\x00\x00\rIHDR\x00\x00\x00\x0E\x00\x00\x00\x0E\b\x06\x00\x00\x00\x1FH-\xD1\x00\x00\x00\tpHYs\x00\x00\x0B\x13\x00\x00\x0B\x13\x01\x00\x9A\x9C\x18\x00\x00\x01VIDAT(\xCF\xA5\x91\xB1j\xC2P\x14\x86\x93\xD6\x94\x98\xA4\xB5\xA5\x85\x0E-R\xAF\xA5\xB8\xF4\x1D\xAA\xEF\x10_B\x9C\xDD\x0B]\xA4o`C\xE9$B\x1C\xCD\x10\x10C6\x05q\td\xA9%\x83d2\x83O\xF0\xF7\xDCp#i\xB5\x1D\xDA\xC0\xC7\xB97\xE7|\xF7\xDC\xCB\x91\x00H\x7FA\xFA\xB7\x98\xFF\xAA\xD5\xEA\x0B\x855\xC1\x13k\xDA\xBF\xEA\x9A\xA6\x9C\x18\xC6\xC1\xB6\xE8\xBBHE\x16\x85w\xC6\xD8\xE3\x91\xA2\xDCQ|\xA2\xFD\x07\xC57\xADXT\x8B\xAAz\xB8#\x8A\x13\xD7\xBC\xD8\xD0\xB4kC\xD7\x19q\xCB*\x95g\xFA\x9FP\xD7\x0B\x8A\n!oE.\xB5Z-\xEC\xA3\xD9l\xA2\xFEP\x07\x1D\xC8;\x18D!/\x16x\x91\xEF\xFBX.\x97\xD8l6H\x92$]O\xA7S\x8CF#\x887\x9F\x13j^T\xB9\xD8\xE9t0\x99L\x10\xC71V\xAB\x15\x82 \xC0\xD0\x1E\xA2\xDDng\xE2\x15q\x9C\x175.:\x8E\x83\xC5b\x81(\x8A \xCB2\xE6\xF39\\\u00D7E\xBF\xDF\xCF\xC4\x1B\xE24/\x1A\\\u00ECv\xBB\xF0<\x0Fa\x18\xA2\xD1h`<\x1E\xC3\xB2,\x98\xA6\x99\x89\x8C8\xDB\x11\x07\x83AzU\xDEu6\x9B\xA5\xA2m\xDB\xE8\xF5z?\x8B4\xC3,\xF9\x1B_E1\x9F\x12Q&j\xC4\xFD\x1Ej\"_\xCA\x8B\x051\xA3K\x91d{(\x8B\xBC\xFE\t\xC1TI!\xE3L\x03\x7F\x00\x00\x00\x00IEND\xAEB`\x82",
 pngNop = "\x89PNG\r\n\x1A\n\x00\x00\x00\rIHDR\x00\x00\x00\x0E\x00\x00\x00\x0E\b\x03\x00\x00\x00(\x96\xDD\xE3\x00\x00\x00\x03PLTE\x00\x00\x00\xA7z=\xDA\x00\x00\x00\x01tRNS\x00@\xE6\xD8f\x00\x00\x00\x15IDATx\xDA\xDD\xC1\x01\x01\x00\x00\x00\x80\x90\xFE\xAF\xF6#\xDA\x01\x00\xD2\x00\x01\xCC \x10\x14\x00\x00\x00\x00IEND\xAEB`\x82",
 w = new Window('dialog', " ExtendScript Memory"),
 p1 = w.add('panel', u, "References"),
 lRefs = p1.add('listbox', u, "",
 numberOfColumns: 4,
 showHeaders: true,
 columnTitles: ["Address", "Type", "Name", "Refs"],
 columnWidths: [90,60,120,36],
 g = w.add('group'),
 pFrom = g.add('panel', u, "From"),
 lFrom = pFrom.add('listbox', u, "",
 numberOfColumns: 4,
 showHeaders: true,
 columnTitles: ["Address", "Type", "Name", "Property"],
 columnWidths: [90,60,120, 120],
 pTo = g.add('panel', u, "To"),
 lTo = pTo.add('listbox', u, "",
 numberOfColumns: 4,
 showHeaders: true,
 columnTitles: ["Property", "Address", "Type", "Name"],
 columnWidths: [120,90,60, 120],
 g.orientation = 'column';
 w.orientation = 'row';
 w.alignChildren = ['left','top'];
 lRefs.maximumSize = lRefs.minimumSize = [330,450];
 lFrom.maximumSize = lFrom.minimumSize = [420,120];
 lTo.maximumSize = lTo.minimumSize = [420,220];
 lRefs.onChange = function()
 lFrom.removeAll();
 lTo.removeAll();
 lFrom.parent.text = "From";
 lTo.parent.text = "To";
 if( !this.selection ) return;
 var key = '&'+this.selection.text,
 t = o[key],
 from = t.from,
 i = from.length,
 k;
 lFrom.parent.text = "["+key.substr(1)+"] is reachable from " + t.ppCount + (1<t.ppCount ? " properties" : " property");
 if( t.ppCount && !i )
 with( lFrom.add('item', '--------') )
 image = pngNop;
 subItems[0].text = '';
 subItems[1].text = '<UNKNOWN REFERRER>';
 subItems[2].text = '';
 while( i-- )
 k = from[i][0];
 t = o[k];
 with( lFrom.add('item', k.substr(1)) )
 image = t.locked ? pngLock : pngNop;
 subItems[0].text = t.type;
 subItems[1].text = t.name + ' ' + t.tag;
 subItems[2].text = from[i][1];
 for( k in o )
 if( !o.hasOwnProperty(k) ) continue;
 t = o[k];
 from = o[k].from;
 i = from.length;
 while( i-- )
 if( from[i][0]!=key ) continue;
 with( lTo.add('item', from[i][1]) )
 image = pngNop;
 subItems[0].text = k.substr(1);
 subItems[1].text = t.type;
 subItems[2].text = t.name + ' ' + t.tag;
 lTo.parent.text = "["+key.substr(1)+"]'s properties had access to " + lTo.items.length + " addr.";
 from = t = null;
 for( i=0, n=a.length ; i < n ; ++i )
 t = o[k=a[i]];
 with( lRefs.add('item', k.substr(1)) )
 image = t.locked ? pngLock : pngNop;
 subItems[0].text = t.type;
 subItems[1].text = t.name + ' ' + t.tag;
 subItems[2].text = t.ppCount + '/' + t.rfCount;
 w.show ();
// TEST
var t;
var f = function MyFunc()
 (function MyInnerFunc(){})();
$.scanRefs(1);
@+
Marc

In webdynpro ,Passing field symbols as values to class methods

Hi
Please tell me the ways of accessing database in webdynpro abap(not directly). I am calling Class method for accessing database. As currently I am directly accessing database in my webdynpro application. I have created a class and method for the same.
In my method I want to use select statement which will return table with values to webdynpro application. So for select statement(Calling Method) I need to use my field symbol values as where in clause .
Could anyone please help with example code?
Thanks,
Ujjwal

data: in_line type ref to data.
CREATE DATA in_line LIKE LINE OF <dyn_tab>.
ASSIGN in_line->* TO <dyn_wa>.
You can create a data reference and assign it to a field symbol and change the values. direclty passing field symbols is not possible.
Abhi

IN R12 -- HOW TO CREATE RECEIPT METHOD IN RECEIVABLES

IN R12 --> HOW TO CREATE RECEIPT METHOD IN RECEIVABLES
SET UP
RECEIPTS-------> RECEIPT CLASSES
I CREATED NEW RECEIPT CLASS AND NEW RECEIPT METHOD
WHEN CREATING NEW RECEIPT METHOD
BANK ACCOUNTS---------->
I AM ABLE TO SELECT THE DETAILS FOR THE FOLLOWING
1. OPERATING UNIT
2. BANK NAME
3. BRANCH NAME
4. EFFECTIVE DATES
5. CASH ACCOUNT
6. UNAPPLIED RECEIPTS
7. UNIDENTIFIED RECEIPTS
8. ON ACCOUNT RECEIPTS
BUT WHEN COMES TO THE
UNEARNED DISCOUNTS AND
EARNED DISCOUNTS I AM UNABLE TO GET LOV FOR THAT
IN THE SET UP----> SYSTEM OPTIONS ----> MISCELLANEOUS
I CHECKED THE CHECK BOX TO YES FOR
ALLOW UNEARNED DISCOUNTS
PLEASE GIVE SOLUTIONS FOR THIS
THANKS IN ADVANCE
PRINCE

Hi
Thank You Ketter Ohnes for Reply,
AR: Setup: Receipts: Receivable Activities
When i am doing above set up it is giving the following error.
PLEASE DEFINE A PARTY TAX PROFILE FOR OPERATING UNIT & ORG_ID
Thanks and Regards
Prince

How to find out which class/method is calling System.gc

Hi
I am seeing frequent FULL GC and not able to locate which particular class/method is calling the System.gc(). I have disabled it using -XX:DisableExplicitGC and performance issues have been resolved. Also, I noticed that it does not happen periodically, so it is not RMI GC. How to find out who exactly is doing this? Does any of of the profilers like Optimizeit/Jprobe help find out this.
Thanks

Hi
I am seeing frequent FULL GC This is because you are creating and destroying objects VERY frequently. Try to look at your design and see where you can reuse objects (i.e. object pooling) if possible, that is if this is adversely affecting performance.
and not able to locate
which particular class/method is calling the
System.gc(). Classes don't call GC. The VM handles that automagically.
I have disabled it using
-XX:DisableExplicitGC and performance issues have
been resolved. Also, I noticed that it does not
happen periodically, so it is not RMI GC. How to find
out who exactly is doing this? Does any of of the
profilers like Optimizeit/Jprobe help find out this.OptimizeIt will tell you everything you need to know. However, NetBeans offers a free profiler now!

How can I create a method with throws instruction

Hello Everybody!
How can I create this method inside WebDynpro.
I enter "throws CloneNotSupportedException" manually an it removes always.
What is wrong ?
public java.lang.Object clone( ) throws CloneNotSupportedException{
    //@@begin clone()
     __Tdag__Is_Charactconfig that= (__Tdag__Is_Charactconfig)super.clone();
       return that;
    //@@end
Regards
sas

I only checked in my 7.1 IDE and there this section exists.
If it does not exist in your IDE, just create the method manually in the //@@begin others ... //@@end user-coding-area at the end of the controller class. This solves the issue for methods that are called from inside the controller. For public methods to be called from other controllers, this will not help.
Armin

How to call inner class method in one java file from another java file?

hello guyz, i m tryin to access an inner class method defined in one class from another class... i m posting the code too wit error. plz help me out.
// test1.java
public class test1
     public test1()
          test t = new test();
     public class test
          test()
          public int geti()
               int i=10;
               return i;
// test2.java
class test2
     public static void main(String[] args)
          test1 t1 = new test1();
          System.out.println(t1.t.i);
i m getting error as
test2.java:7: cannot resolve symbol
symbol : variable t
location: class test1
          System.out.println(t1.t.geti());
^

There are various ways to define and use nested classes. Here is a common pattern. The inner class is private but implements an interface visible to the client. The enclosing class provides a factory method to create instances of the inner class.
interface I {
    void method();
class Outer {
    private String name;
    public Outer(String name) {
        this.name = name;
    public I createInner() {
        return new Inner();
    private class Inner implements I {
        public void method() {
            System.out.format("Enclosing object's name is %s%n", name);
public class Demo {
    public static void main(String[] args) {
        Outer outer = new Outer("Otto");
        I junior = outer.createInner();
        junior.method();
}

Getting error while creating abstract method

hi folks,
i facing issue for ABSTRACT Class.
I am trying to create abstarct method, (refered example from saptechnical site),
I created one attribute i-num, created one method AREA, in implementation area , i made it as Abstract, then i did syntax check, then it is giving below error.
*Class ZTEST_CLASS01_AB,Method AREA
The abstract method "AREA" can only be implemented after its
redefinition (METHODS AREA REDEFINITION).*
i tried all the ways..
created subclass for this, i writted some code in AREA of Sub-class, there it is giving dump, because first one is not activated properly..
could you please somebody help me on this.
Sri

Hello Arshad,
Create a class(ZABSTRACT) and make its type as Abstract( Which means atleast one of its methods is abstract)
We can have abstract classes with all it's methods as non-abstract or concrete. A small example is given below:
CLASS gcl_abstract DEFINITION ABSTRACT.
PUBLIC SECTION.
    METHODS concrete. "Concrete
ENDCLASS.                    "gcl_abstract DEFINITION
*       CLASS gcl_abstract IMPLEMENTATION
CLASS gcl_abstract IMPLEMENTATION.
METHOD concrete.
    WRITE: / `I'm a concrete method`.
ENDMETHOD.                    "concrete
ENDCLASS.                    "gcl_abstract IMPLEMENTATION
*       CLASS gcl_abstract_sub DEFINITION
CLASS gcl_abstract_sub DEFINITION INHERITING FROM gcl_abstract.
PUBLIC SECTION.
    METHODS concrete REDEFINITION.
ENDCLASS.                    "gcl_abstract_sub DEFINITION
*       CLASS gcl_abstract_sub IMPLEMENTATION
CLASS gcl_abstract_sub IMPLEMENTATION.
METHOD concrete.
    super->concrete( ).
    WRITE: / 'Abstract class might not have abstract methods at all!'.
ENDMETHOD.                    "concrete
ENDCLASS.                    "gcl_abstract_sub IMPLEMENTATION
START-OF-SELECTION.
DATA: go_abstract TYPE REF TO gcl_abstract_sub.
CREATE OBJECT go_abstract.
go_abstract->concrete( ).
Although i will agree there is no point in making a class as abstract & having no abstract method
@Sri: Looks like you're trying to implement the abstract method "AREA" in the abstract class hence the error. For abstract method you cannot define their implementation in the corres. abstract class.
BR,
Suhas
Edited by: Suhas Saha on Mar 30, 2011 12:04 PM

I dont understand creating classes they seem a waste of time and efficiency

I dont understand why we would want to create classes with constructors and get and set statements... I know that VB and Java did not create these just to have us writing extra code so I am missing something in my thinking.
I read about data hiding and that I understand I guess...but everytime my professors want me to create a class then create an object from that class to access it I dont really get it. I know how to do the basics of it but I can do all of it in my main or the primary class whats the benefit of creating a whole entire class such as the following?
Everytime I get an assignment and they are like create a class and I try to rack my head for a good idea but the nearest analogy I can come up with is this... creating your own class seems like one of those old straws you drink out of with all the loops, yes you can make it go around in a big loop but why waste time? you want to get to point A to point B so create the most efficient way to get there if possible.
I am sure the problem is I am not seeing something and there is some logic missing but I just am getting irritated as I am not seeing it and I am finding it, its like I add an extra obstacle course to my code for no other reason than to run through a bunch of extra tasks that I could perform in my main class or main.
input is welcome to help me arrive at some type of enlightenment thanks
Class may not be the correct wording for this as I know we have to have a class but what I mean is a non application class. The class I have below goes with another class that actually does a lot of stuff but I am forced to push data through this class that basically does nothing but run water through some different pipes if you will. To me thats a waste when I can do everything in my original class which was called menu that I am messing with and that creates an array for a user who wants to keep a list of his items and prices of those items in inventory.
public class Item
private String itemName;
private double itemPrice;
 public Item()
public Item (String item, double price)
setName(item);
setPrice(price);
public String getName()
 return itemName;
public void setName(String item)
 itemName = item;
public double getPrice()
 return itemPrice;
public void setPrice(double price)
 itemPrice= price;
Edited by: Bricatw on Oct 30, 2009 10:33 PM

What I was plugging into it and please forgive the code as its not finished... (I am still messing with it) its just for learning and I am required to have certain parts in the Item Class and Certain parts in the Menu class..... But you it pushes through the input to the java bean.... in a case like this I just dont see the need for doing it not that I can think of anyway.
import java.util.Scanner;//my imports for scanner so can read from the screen
import java.util.*;//imports for my array I used astrix to just import it all as the book said it does not have any negative affects.
public class Menu //My application class Menu that contains my main
 public static void main(String[] args)//Main method
 final int NUMBER_Of_Elements = 30; //created a symbolic constant so that I only have to change the constant
 //to edit the size of the array if I should want to change it.
 Item[]inventory = new Item[NUMBER_Of_Elements];//I create a new array object with the constant as the number of elements.
 Scanner sc = new Scanner (System.in);//created object from the scanner class used to get input from the console screen.
 System.out.println("Please enter Item on first line and price on second line.");//outputted text to prompt user and give instructions.
 System.out.println("Enter STOP to exit");//instructions on how to exit the program. I would have rather used a different
 //word than stop here. If my choice I would have used "exit" as its more widely used and to promote uniformity.
 int count;//count variable used to count my loops very important as we use it to control our arrays and loops here.
 double price;//our variable that we plug in values from the user via the console.
 String item;//same as previously mentioned for the "price"
 System.out.println("Wings Coffee Shop Menu");
 System.out.println("");
 System.out.println("Menu Item Price");
 for (count=0; count<inventory.length; ++count)//This is our for loop it uses the length method to control how many times
 //it runs. In this case inventory.length = 30 elements so would run 30 times unless it stopped early.
 item = sc.nextLine();//reads the input from console into the item variable.
 if(item.equalsIgnoreCase("STOP"))//if statement that states if = stop (ignores case sensitivity) then it will break out of the loop.
 break;//the break command which is executed if the if statement is true.
 price = Double.parseDouble(sc.nextLine());//
 inventory[count]= new Item(item, price);
 Item Call = new Item(item, price);
 System.out.printf("%-13s %.2f\n", Call.getName(), Call.getPrice());
 System.out.println("Wings Coffee Shop Menu");
 System.out.println("");
 System.out.println("Menu Item Price");
// for(int x = 0; x < count; ++x)
// System.out.printf("%15s\n",inventory[x].toString());
// System.out.printf("%-13s %.2f\n", Call.getName(), Call.getPrice());
// String[] namesOfItems = {"Coffee", "Milk", "Soda", "Bagel", "Croissant", "Donut"};
// double[] prices = {3.99, 2.99, 2.49, 2.99, 2.49, 1.99};
// for(int x = 0; x < prices.length; ++x)
// System.out.printf("%-13s %.2f\n", namesOfItems[x], prices[x]);
// Item arrayPrice = new Item(); HOW COME I CANNOT CREATE THIS OBJECT?
// Item call = new Item ();
// Item Call = new Item("item", 4.9);
Edited by: Bricatw on Oct 30, 2009 11:22 PM

Can't navigate to a page when using a class method

I am working on windows phone 8.1 universal app where I have created a class method and placed it in the NavigationHelper_LoadState method of one of the pages in my app. My navigation is as follows, I click on a link on my Mainpage and that takes me
to the page in question, where I have placed the class method in LoadState.
The class method checks the authentication state of the user. If the user is not logged in, it is supposed to take him to a separate login page (SHDSignIn from the snippet below).
The problem I am running into is that when I hit that part of the code in my class method, it just steps through the redirect code but doesn't take me to the login page but rather takes me to the page that was clicked from mainpage.
From the troubleshooting I have done up to this point seems like an issue probably because I am calling the method from NavigationHelper_LoadState and the system doesn't like it?? Can someone please explain and also provide a workaround for this?
Here is my code for the class function:
public async void SHDAuthState(string errormessage, ProgressBar myprogressbar, TextBlock mytextblock, TextBlock myservernetworkerror)
//Get the values for the userID and password from the settings....
string shdLoggedInValue = (string)appRoamingSettings.Values["shdLoggedIn"];
//If not logged in, redirect to the SHD sign in page...
if (shdLoggedInValue != "Yes")
this.rootFrame.Navigate(typeof(SHDSignIn));
//Getting the cookie if it has expired..
else
//Get the cookie value...
string myCookieValue = (string)appRoamingSettings.Values["MyCookie"];
//Get the original cookie obtain time....
long CookieObtainedTimeValue = (long)appRoamingSettings.Values["CookieObtainedTime"];
//Convertig date/time back to DateTime object....
origCookieObtainedTime = DateTime.FromBinary(CookieObtainedTimeValue);
currentDateTime = DateTime.Now;
//Check to see if cookie has expired....
cookieTimeElasped = currentDateTime - origCookieObtainedTime;
cookieTimeElapsedMins = cookieTimeElasped.TotalMinutes;
// 2 days = 2880 mins but we give a margin of 1 minute
//Get a new cookie if it has expired and save to settings
if (cookieTimeElapsedMins >= 2879)
// Start showing the progress bar...
mycontrols.progressbarShow(myprogressbar, mytextblock);
//Get the values for the userID and password from the settings....
string UserIDValue = (string)appRoamingSettings.Values["UserID"];
string PasswordValue = (string)appRoamingSettings.Values["Password"];
//Update the requestData string before sending.....
requestData = "{" + string.Format(RegisterRequestData, UserIDValue, PasswordValue) + "}";
string registerResults = await SHDAPI(registerUrl, requestData, errormessage);
if (registerResults != null)
// Get the cookie and the time and save it to settings
var shdCookie = JsonConvert.DeserializeObject<SHDHelper.SHDObject>(registerResults).RegistrationCookie;
//Save cookie to the app settings
appRoamingSettings.Values["MyCookie"] = shdCookie;
// build the UI
// Stop showing the progress bar...
mycontrols.progressbarNoShow(myprogressbar, mytextblock);
else
// Stop showing the progress bar...
mycontrols.progressbarNoShow(myprogressbar, mytextblock);
//Show the error message...
myservernetworkerror.Visibility = Windows.UI.Xaml.Visibility.Visible;
Also, I have the rootFrame defined as follows in my class:
Frame rootFrame = Window.Current.Content as Frame;
I am calling the class method from the LoadState method as follows
SHD_helper.SHDAuthState(errorMessage, pgbar, pgText, ServerNetworkError);
thanks
mujno

that is correct. I wanted to keep the login page redirect inside my class method so that I could do the check every time someone came to pages that require authentication. I wanted it in the LoadState method so I can do a check there, redirect
them to login page or just get a cookie and then pass that cookie to page to build the UI for the page
I can do what you are suggesting and have actually tried it but then I have to track which page to take the user to after they log in...
I have multiple clicks in the appbar and pages from where the user can come to these authentication-bound pages..
Suggestions?
Also, what am I doing wrong in my class method that it doesn't navigate to the login page in the LoadState method?
Thanks
mujno

Class method for XI data into R/3????

Hi Experts,
I have a very big problem..please help me!!!!
We need to create a program that will call data from XI interface and populate the internal table in R/3?
Can any1 of u give me the steps to go forward with it?
I read some documents and found that we need to use Class METHOD.. but I am new to OOPS and dont know anything in it.
Its about server proxies I guess!!!
I need to finish this in 1 day...
Please help.. answers will be rewarded with points...

Hi, Thanks for the reply. I cannot use IDOC.
I have data in XI interface in form of XML data and i want to populate internal table in R/3 with this XML data(From XI).
If anybody can give me the steps to do the same, it will be very helpful.
my mail id is [email protected]
please try to send me the steps with an example...

Invoking Derived Class Method

Hi pls go through the below code, can any one give me solution how to access the Derived class method in this Point.
Note: In the below code , only in runtime we will come to know which Derived class method is going to invoke(So in runtime we will get Derived class name in the form of String). So Iam trying to Use Class.forName("Clas name") to create the instance of the Derived class and then type casting to base class.
Why iam casting to base class is , since only in the run time we are geting the Derived class name.
Result : iam geting the compiletime error says that no valid method fond in Mybase though it contains the reference of derived.
abstract class MyBase
public void display(int i)
System.out.println(" Base class Method");
class MyDerived extends MyBase
public void display(String str)
System.out.println("Derived class Mthode");
class MyMain
public static void main(String arg[])
String DrivObj=arg[0];
MyBase baseObj=(MyBase) Class.forName("DrivObj").newInstance();
baseObj.display("SomeString"); }
}

The problem is, can not have subclass reference bcoz
iam geting the subclass name only in the runtime and
one more thing is cant touch my base and subclass to
do changes as u said Your design is then definately very bad.
, is there any other way to do
it.Yes, you can use reflection to invoke the method.
Kaj

Creating class & methods

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