Quick tutorial of using methods of class

Hi,
I have never use methods of class before. Is there anyone can give me a quick tutorial how to do it?
To be more specific I need convert field 'DAUER' into the required format using one of the following methods of class 'CL_HR_T510_PSRCL':
CONVERT_DURATION_TO_MMMM: Duration Conversion to Format 'MMMM'
CONVERT_DURATION_TO_MMMM: Duration Conversion to Format 'YYMM'
Please be more detailed in describing it.
Your help will greatly appreciate.
Thanks,
Veb

Hello Veb,
You will find at this sdn page at section ABAP Objects , documentations and links about ABAP OO :
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/webcontent/uuid/35eaef9c-0b01-0010-dd8b-e3b0f9ed7ccb#section7 [original link is broken]
For your example :
1) You can use like this :
CALL METHOD CL_HR_T510_PSRCL=>CONVERT_DURATION_TO_MMMM
EXPORTING
    DURATION = old_duration
RECEIVING
    MMMM     = new_duration.
1) Like this :
l_dauer = convert_duration_to_mmmm(
                             duration = l_dauer).
Best regards

Similar Messages

How to make a field manadatory within ALV Grid using methods and classes

Hi,
I am using ALV Grid using set_table_for_first_display
inside my dialog programming. I have a field called project number inside my grid which has to be made as mandatory field.
I have defined a method called catch_data_changed inside my class lcl_event_receiver. This method captures the changes made to one of the fields inside my ALV grid and displays all the default values of the other fields from the grid.
Now, i have to make project number which is one of my fields inside my ALV grid as mandatory. At the field catalog level i did not find any such option for making a field as required field.
Is there any other way, i can accomplish this within the ALV grid?

from my understanding from ur question, i understood that u want the editable field inside alvgrid to be mandatory.
i dont know anthing in fieldcat, but u can try the following logic.
FORM DATA_CHANGED USING P_ER_DATA_CHANGED TYPE REF TO
CL_ALV_CHANGED_DATA_PROTOCOL .
DATA: L_VALUE TYPE LVC_VALUE,
    ls_mod_cell type lvc_s_modi.
READ TABLE P_ER_DATA_CHANGED->MT_MOD_CELLS INTO LS_MOD_CELL.
if sy-subrc = 0.
    CALL METHOD P_ER_DATA_CHANGED->GET_CELL_VALUE
      EXPORTING
        I_ROW_ID    = LS_MOD_CELL-row_id
        I_FIELDNAME = LS_MOD_CELL-fieldname
      IMPORTING
        E_VALUE     = L_VALUE.
IF LS_MOD_CELL-FIELDNAME <> 'fieldname what u want'
MESSAGE 'ENTER VALUE INTO (fieldname u want) ' TYPE 'I'.
ENDIF.
ELSE.
MESSAGE 'ENTER VALUE INTO (fieldname u want) ' TYPE 'I'.
ENDIF.

Creation of Material using BDC Session method & global class

Hi
Creation of Material using BDC Session method & global class by using oops.
can anyone plz help me out

Hi,
it looks like it's not possible to call this BAPI wihtout material number. Here is a quote from BAPI documentation.
When creating material master data, you must transfer the material
number, the material type, and the industry sector to the method. You
must also enter a material description and its language.
Cheers

Explizit using methods of base class

when using a base class reference from an abstract class A and creating an object of subclass B
A ref_A = new B();
assuming we have implemented the method m() in A and B, then
ref_a.m()
calls Method m of subclass B
(dynamic binding, fine)
Is there a possibility to force explicitely the call of method m of superclass A.
(i mean not a call from Method m in B with super())

are you absolutely sure ?I am sure. Perhaps you are thinking of C++ (and if you're not, I am!) where you can write: ref_A.A::m(),
but there's no way from the client code to do that in Java. If you really need to do this, your
design of A should reflect it:
public abstract class A {
    public final void mOldSchool() {...}
    public void m() { mOldSchool(); }
public class B extends A {
    public void m() {...}
}I agree with Kayaman, though: question your design. In the abstract, this is a shakey design.

How to use method of one class in other class.

Hi.I am new to object orient approach .I am developing a project which has a class as application .My class has it state control as another class which is notification class.I want to use my notification class method (init)in my application class method .i have also used read and write accessors vis.But i have broken lines in my code.Please help me correct it. and print screen is attached below.
Attachments:
Application.docx ‏143 KB

On the left, you have wired 2 sources on the same tunnel/wire, so that's 1 broken wire.
In the For loop, you are trying to wire a "Red" object from the first subVI to the input of the "Green" subVI, so a "Green" object. If Red is not a descendant class of Green (or share a common ancestor), it is not permitted.
FInally, the output of the For loop, is a 1D array of "Green" objects, which is probably not the same data type as the input of the last subVI on the right (it's probably a "Green" object scalar).
Overall, you can use the "List Errors" dialog box (Ctrl+L) to debug your code, and make exhaustive use of the contextual help (Ctrl+H) to see what is going on when focusing a broken wire.
Regards
Eric M. - Application Engineering Specialist
Certified LabVIEW Architect
Certified LabWindows™/CVI Developer

Using Methods not Defined in a class that you are calling them from

For one of my assignment I have had to create a class with methods and then create another class to test the methods.
I keep getting the error message "cannot resolve symbol"
And the error points to the line where I am calling the class.
I have put the classes in a package and imported them.
Here is the method I am calling.
public boolean validDate(int day, int month, int year)
if(leapYear(year))
daysInMonth = 29;
else
getNumberOfDaysInMonth(month);
return true;
This is how I am calling it from the test class
if(validDate(day1,month1,year1))
testnewDate.java:38 cannot resolve symbol
symbol : method validDate(int,int,int)
location:class newdate.testnewDate
if(validDate(day1,month1,year1))
^
If anyone is able to help I can give you my java source files if I haven't given enough information.

You can't call another class's method directly from your class. You need to get an object of that class and should call the method using that object.
If you have written public boolean validDate(int day, int month, int year) method in class DateValidator, then from your test class, you have to call that like this,
DateValidator dv = new DateValidator();
if(dv.validDate(day1,month1,year1)) {
// Take actions
Hope it is clear.
Sudha

Use methods of another class

Dear Sir/madam,
i have a question about using methods of another class. I will explane:
i have made a class which is called A. This class has some attributes (studentName and examRank) and some methods.
Now i need to made another class called B. Now i want to make an array where i can add some attributes of objects which i made of class A. How can i do that?
Kind regards

Here's a for-instance that doesn't use your exact program but demonstrates the point:
public class A
int value;
String name;
public A(int value, String name)
    this.name = name;
    this.value = value;
public int getValue()
    return value;
public String getName()
    return name;
public String toString()
    return name + ": " + value;
import java.util.Arrays;
import java.util.Random;
public class B
private static final String[] NAMES =
    "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
private static final int MAX = 100;
private A[] myAs = new A[NAMES.length];
private Random random = new Random();
public B()
    for (int i = 0; i < myAs.length; i++)
      myAs[i] = new A(random.nextInt(MAX), NAMES);
public String toString()
return Arrays.toString(myAs);
public int getTotal()
int temp = 0;
for (int i = 0; i < myAs.length; i++)
temp += myAs[i].getValue();
return temp;
public static void main(String[] args)
B b = new B();
System.out.println(b);
System.out.println("Total: " + b.getTotal());

How shall I use an other class's methods in a class

Hi all,
I have two classes in the same directory. When I try to use a method of class in the other one, I get a compile error. Everything seems ok, bu could not understand the reason. The two classes and the error text are copied below. Any help will be appriciated.
import java.io.*;
import java.net.*;
import java.sql.*;
public class MainThread extends Thread{
//creating an object from CountryEnterence class
private CountryEnterence cnt;
public void MainThread(){
start();
public void run() {
//calling a function of CountryEnternce class
cnt.countryEnter(countryName,countryCode);
/***And part of the CountryEnterence class is as belows:*/
public class CountryEnterence{
public countryEnter(String countryName,String countryCode){
The error message when I try to compile MainThread is as follows:
MainThread.java:17: cannot resolve symbol
symbol :class CountryEnterence
location :class MainThread
private CountryEnterence conEnt;
Regards,
Dirgen

hi Chuck, thanks for your reply.
Infact the actual code defines the countryEnter() method with an integer return type.
Here my real problem is as belows:
C:/myDirectory/Class01.java
C:/myDirectory/Class02.java
public class Class01{
private Class02 obj=new Class02();
public void aMethod(){
obj.aMethodOfClass02();
When I try to compile Class01, I always get the error like "java can not resolve the symbol Class02"
Do you think I am mistaking?

Use methods in other classes

Can I use methods from other classes than the class that myClass extends?
ex. myClass extends parentClass{
myMethod()
myMethod() is declared in i third class. Is this possible or can I only use classes from the parent class?
-Thanks-

I'm not really sure what the previous two answers were getting at.
Yes, you can use methods all the way up the class hierarchy, as long as they are visible.
For example, Object implements toString(). You can call toString() on any object in Java and it will render the object to a string in one way or another. That is because toString() is public.
If toString() were protected, you would only be able to call the method if you were a subclass of of that object (or in the same package), which would make the toString() method much less useful.
I would suggest reading up on the differences in the four visibility modifiers (private, (default), protected, and public). Private is the only one which nothing else can call. If you are public or protected, any subclass can call the method, even if there are 20 superclasses between the implementor and the caller.
Good luck!
Steve

Can we use transient keyword with methods of class?

I just knew that the keyword transient is being used to ignore the Java serialization for variables.
Could we use this for class methods??

makpandian wrote:
I dude i am preparing myself for SCJP6.
Therefore i asked so.
I apologize for my mistake.No need for an apology. Rather than simply memorizing the factoid of whether or not the transient keyword may be applied to methods, take the time to understand what transient means. If you remember the purpose of marking a member transient, you'll have no problem with answering correctly on the test.
Good luck!
~

One method used in two classes

Hi
I have one method in class A and I need to use it (only this method) in class B. what should I do? Should I create subclass within class A with this method, and then use it in class B or create completely different class C with only this method?
Thanks
waso

It's a good idea to use Java conventions about cAsE: especially since boolean and Boolean are different beasts.
So:
public class MyExample {
    public boolean example() {
        System.out.println("My example");
        return true;
}You use it in some other class B like this:
class B {
    void someMethod() {
        MyExample eg = new MyExample();
        boolean result = eg.example();
        System.out.println("example() returned " + result + " (as expected!)");
}There's no subclassing ("in" A or elsewhere).
This is a bit of a contrived example, because example() always returns the same thing. eg is initialised as an instance of MyExample but that class has no state so the method is effectively static. If MyExample had state and the method call did something genuine involving this state, then things would get interesting - and it is precisely then that subclassing, extracting someMethod() into some other class, or inlining it where it was used would make no sense.
Edited by: pbrockway2 on Jul 12, 2008 9:26 PM

How to use the Rectangle class to draw an image and center it in a JPanel

I sent an earlier post on how to center an image in a JPanel using the Rectangle class. I was asked to send an executable code which will show the malfunction. The code below is an executable code and a small part of a very big project. To simplifiy things, it is just a JFrame and a JPanel with an open dialog. Once executed the JFrame and the FileDialog will open. You can then navigate to a .gif or a .jpg picture and open it. What I want is for the picture to be centered in the middle of the JPanel and not the upper left corner. It is also important to stress that, I am usinig the Rectangle class to draw the Image. The region of interest is where the rectangle is created. In the constructor of the CenterRect class, I initialize the Rectangle class. Then I use paintComponent in the CenterRect class to draw the Image. The other classes are just support classes. The MyImage class is an extended image class which also has a draw() method. Any assistance in getting the Rectangle to show at the center of the JPanel without affecting the size and shape of the image will be greatly appreciated.
I have divided the code into three parts. They are all supposed to be on one file in order to execute.
import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
public class CenterRect extends JPanel {
    public static Rectangle srcRect;
    Insets insets = null;
    Image image;
    MyImage imp;
    private double magnification;
    private int dstWidth, dstHeight;
    public CenterRect(MyImage imp){
        insets = getInsets();
        this.imp = imp;
        int width = imp.getWidth();
        int height = imp.getHeight();
        ImagePanel.init();
        srcRect = new Rectangle(0,0, width, height);
        srcRect.setLocation(0,0);
        setDrawingSize(width, height);
        magnification = 1.0;
    public void setDrawingSize(int width, int height) {
        dstWidth = width;
        dstHeight = height;
        setSize(dstWidth, dstHeight);
    public void paintComponent(Graphics g) {
        Image img = imp.getImage();
     try {
            if (img!=null)
                g.drawImage(img,0,0, (int)(srcRect.width*magnification), (int)(srcRect.height*magnification),
          srcRect.x, srcRect.y, srcRect.x+srcRect.width, srcRect.y+srcRect.height, null);
        catch(OutOfMemoryError e) {e.printStackTrace();}
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Opener().openImage();
class Opener{
    private String dir;
    private String name;
    private static String defaultDirectory;
    JFrame parent;
    public Opener() {
        initComponents();
     public void initComponents(){
        parent = new JFrame();
        parent.setContentPane(ImagePanel.panel);
        parent.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        parent.setExtendedState(JFrame.MAXIMIZED_BOTH);
        parent.setVisible(true);
    public void openDialog(String title, String path){
        if (path==null || path.equals("")) {
            FileDialog fd = new FileDialog(parent, title);
            defaultDirectory = "dir.image";
            if (defaultDirectory!=null)
                fd.setDirectory(defaultDirectory);
            fd.setVisible(true);
            name = fd.getFile();
            if (name!=null) {
                dir = fd.getDirectory();
                defaultDirectory = dir;
            fd.dispose();
            if (parent==null)
                return;
        } else {
            int i = path.lastIndexOf('/');
            if (i==-1)
                i = path.lastIndexOf('\\');
            if (i>0) {
                dir = path.substring(0, i+1);
                name = path.substring(i+1);
            } else {
                dir = "";
                name = path;
    public MyImage openImage(String directory, String name) {
        MyImage imp = openJpegOrGif(dir, name);
        return imp;
    public void openImage() {
        openDialog("Open...", "");
        String directory = dir;
        String name = this.name;
        if (name==null)
            return;
        MyImage imp = openImage(directory, name);
        if (imp!=null) imp.show();
    MyImage openJpegOrGif(String dir, String name) {
            MyImage imp = null;
            Image img = Toolkit.getDefaultToolkit().getImage(dir+name);
            if (img!=null) {
                imp = new MyImage(name, img);
                FileInfo fi = new FileInfo();
                fi.fileFormat = fi.GIF_OR_JPG;
                fi.fileName = name;
                fi.directory = dir;
                imp.setFileInfo(fi);
            return imp;
}

This is the second part. It is a continuation of the first part. They are all supposed to be on one file.
class MyImage implements ImageObserver{
    private int imageUpdateY, imageUpdateW,width,height;
    private boolean imageLoaded;
    private static int currentID = -1;
    private int ID;
    private static Component comp;
    protected ImageProcessor ip;
    private String title;
    protected Image img;
    private static int xbase = -1;
    private static int ybase,xloc,yloc;
    private static int count = 0;
    private static final int XINC = 8;
    private static final int YINC = 12;
    private int originalScale = 1;
    private FileInfo fileInfo;
    ImagePanel win;
    /** Constructs an ImagePlus from an AWT Image. The first argument
     * will be used as the title of the window that displays the image. */
    public MyImage(String title, Image img) {
        this.title = title;
         ID = --currentID;
        if (img!=null)
            setImage(img);
    public boolean imageUpdate(Image img, int flags, int x, int y, int w, int h) {
         imageUpdateY = y;
         imageUpdateW = w;
         imageLoaded = (flags & (ALLBITS|FRAMEBITS|ABORT)) != 0;
     return !imageLoaded;
    public int getWidth() {
         return width;
    public int getHeight() {
         return height;
    /** Replaces the ImageProcessor, if any, with the one specified.
     * Set 'title' to null to leave the image title unchanged. */
    public void setProcessor(String title, ImageProcessor ip) {
        if (title!=null) this.title = title;
        this.ip = ip;
        img = ip.createImage();
        boolean newSize = width!=ip.getWidth() || height!=ip.getHeight();
     width = ip.getWidth();
     height = ip.getHeight();
     if (win!=null && newSize) {
            win = new ImagePanel(this);
    public void draw(){
        CenterRect ic = null;
        win = new ImagePanel(this);
        if (win!=null){
            win.addIC(this);
            win.getCanvas().repaint();
            ic = win .getCanvas();
            win.panel.add(ic);
            int width = win.imp.getWidth();
            int height = win.imp.getHeight();
            Point ijLoc = new Point(10,32);
            if (xbase==-1) {
                xbase = 5;
                ybase = ijLoc.y;
                xloc = xbase;
                yloc = ybase;
            if ((xloc+width)>ijLoc.x && yloc<(ybase+20))
                yloc = ybase+20;
                int x = xloc;
                int y = yloc;
                xloc += XINC;
                yloc += YINC;
                Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
                count++;
                if (count%6==0) {
                    xloc = xbase;
                    yloc = ybase;
                int scale = 1;
                while (xbase+XINC*4+width/scale>screen.width || ybase+YINC*4+height/scale>screen.height)
                    if (scale>1) {
               originalScale = scale;
               ic.setDrawingSize(width/scale, height/scale);
    /** Returns the current AWT image. */
    public Image getImage() {
        if (img==null && ip!=null)
            img = ip.createImage();
        return img;
    /** Replaces the AWT image, if any, with the one specified. */
    public void setImage(Image img) {
        waitForImage(img);
        this.img = img;
        JPanel panel = ImagePanel.panel;
        width = img.getWidth(panel);
        height = img.getHeight(panel);
        ip = null;
    /** Opens a window to display this image and clears the status bar. */
    public void show() {
        show("");
    /** Opens a window to display this image and displays
     * 'statusMessage' in the status bar. */
    public void show(String statusMessage) {
        if (img==null && ip!=null){
            img = ip.createImage();
        if ((img!=null) && (width>=0) && (height>=0)) {
            win = new ImagePanel(this);
            draw();
    private void waitForImage(Image img) {
    if (comp==null) {
        comp = ImagePanel.panel;
        if (comp==null)
            comp = new JPanel();
    imageLoaded = false;
    if (!comp.prepareImage(img, this)) {
        double progress;
        while (!imageLoaded) {
            if (imageUpdateW>1) {
                progress = (double)imageUpdateY/imageUpdateW;
                if (!(progress<1.0)) {
                    progress = 1.0 - (progress-1.0);
                    if (progress<0.0) progress = 0.9;
public void setFileInfo(FileInfo fi) {
    fi.pixels = null;
    fileInfo = fi;
}

How to trap null return values from getters when using Method.invoke()?

Hi,
I am using Method.invoke() to access getters in an Object. I need to know which getters return a value and which return null. However, irrespective of the actual return value, I am always getting non-null return value when using Method.invoke().
Unfortunately, the API documentation of Method.invoke() does not specify how it treats null return values.
Can someone help?
Thanks

What do you get as a result?I think I know what the problem is.
I tested this using following and it worked fine:
public class TestMethodInvoke {
public String getName() {
return null;
public static void main(String args[]) throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
Object o = new TestMethodInvoke();
Class cls = o.getClass();
Method m = cls.getMethod("getName", (Class[]) null);
Object result = m.invoke(o, (Object[])null);
if (result == null) {
System.err.println("OK: Return value was null as expected");
else {
System.err.println("FAILED: Return value was NOT null as expected");
However, when I use the same technique with an EJB 3.0 Entity class, the null return value is not returned. Instead, I get a String() object. Clearly, the problem is the the EJB 3.0 implementation (Glassfish/Toplink) which is manipulating the getters.
Regards
Dibyendu

How to use two activex class objects in same vi

HI
I am using labview to read ECU data from INCA software .INCA providing COMTOOL API(incacom.dll). I am using ACTIVEX for communication between INCA & Labview. My problem is If I have used single activex class object I am able to read Inca version, getting the database path etc. If I have used two activex class in same vi (one to open Inca & other one is to read the folder structure) I am not getting output.I have attached snapshot for referance
Attachments:
activex1.JPG ‏114 KB
activex2.JPG ‏107 KB

It wasnt in the first two images you posted, or I couldnt see it anyway! That was the only reason.
Did you try the database block on its own, just to confirm that it is working?
Beginner? Try LabVIEW Basics
Sharing bits of code? Try Snippets or LAVA Code Capture Tool
Have you tried Quick Drop?, Visit QD Community.

How to use the different class for each screen as well as function.

Hi Experts,
How to use the different class for each screen as well as function.
With BestRegards,
M.Thippa Reddy.

Hi ThippaReddy,
see this sample code
Public Class ClsMenInBlack
#Region "Declarations"
    'Class objects
    'UI and Di objects
    Dim objForm As SAPbouiCOM.Form
    'Variables
    Dim strQuery As String
#End Region
#Region "Methods"
    Private Function GeRate() As Double
            Return Double
    End Function
#End Region
Public Sub SBO_Appln_MenuEvent(ByRef pVal As SAPbouiCOM.MenuEvent, ByRef BubbleEvent As Boolean)
        If pVal.BeforeAction = True Then
            If pVal.MenuUID = "ENV_Menu_MIB" Then
            End If
        Else ' Before Action False
            End If
    End Sub
#End Region
End Class
End Class
Rgds
Micheal
Vasu Anna Regional Feeling a???? Just Kidding
Edited by: micheal willis on Jul 27, 2009 5:49 PM
Edited by: micheal willis on Jul 27, 2009 5:50 PM

Quick tutorial of using methods of class

Similar Messages

Maybe you are looking for