Confusing about how to use "protected"

Hello guys,
I don't know how the "protected" works for a long time.
If you know what's the protected really mean,please tell me.
I am confusing as these follows:
I write a class named "parent",which has a protected field x.
1. If I write a class named "son" which extends the "parent" class in the same package and then new parent() to made an instant named "son",can I use son.x to visit??
2.If I write a class named "son" which extends the "parent" class in the ANOTHER package and then new parent() to made an instant named "son",can I use son.x to visit??(Mybe there is two satuations:one is son.x which is written in a "parent" extended class,the other satuation is son.x which is written in any class except what extends "parent" class)

Hello Vishal,
Let-me try help you.
I don´t know if that´s the best solution, but when I use this class, i do as follow.
First I create the container, and after the grid (with the "I_PARENT" parameter)
DATA: r_container TYPE REF TO cl_gui_custom_container,
            r_grid          TYPE REF TO cl_gui_alv_grid.
CREATE OBJECT r_container
    EXPORTING
      container_name = 'CONTAINER1'.
CREATE OBJECT r_grid
    EXPORTING
      i_parent = r_container.
The parameter i_parent associate the container with the grid.
Don´t forget to built the container using the screen painter (or the screen element´s list, but the screen painter is easer).
I hope it helps you.

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Confused about how to use paint()

Hi, I have been working really hard to try to get the following program to work but I am really confused on how to use paint(). I do not have anyone to ask so I thought this forum could help. Anyways, here is my problem...
I am trying to recursively figure out the Sierpinski fractal. I cannot figure out if my math works or not because I do not know how to call the paint() recursively to draw my triangles.
Please have a look at the following code. Thank you!
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
public class DrawTriangle extends Frame {
Point a = new Point(20,480),
        b = new Point(350,40),
        c = new Point(680,480),
        halfB,
        halfC,
        halfB2,
        halfC2,
        halfC3;
int width;
public DrawTriangle() {
    super("Sierpinski Fractal");
    addWindowListener( new WindowAdapter() {
      public void windowClosing( WindowEvent we ) {
        dispose();
        System.exit( 0 );
    setBackground( Color.white );
    setSize(700, 500);
    setVisible(true);
public void paint(Graphics g, Point a, Point b, Point c) {
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    g.setColor( Color.GREEN );
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    halfC.y = c.y;
    halfB.y = b.y/2;
    halfB.x = b.x;
    halfB2.y = halfB.y + a.y;
    halfB2.x = a.x;
    halfC2.x = halfC.x + a.x;
    halfC2.y = a.y;
    halfC3.x = halfC.x/2 + a.x;
    halfC3.y = halfB2.y;
    paint(g, a, halfC, halfB);
    paint(g, halfC3, halfC, halfB);
    paint(g, halfC2, halfC, halfB);
public static void main(String[] args) {
     new DrawTriangle();

thanks jsalonen, your tip let me start working on the math to correct it.
I have a new problem now. My math is correct but I am having problems with the recursion. I can draw only the top , left , or right triangles. I cannot get them all to work together. See code and comments below.
Any ideas why I cant call all three of the paint()s toegther and have them work?
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
public class DrawTriangle extends Frame {
Point a = new Point(20,480),
        b = new Point(350,40),
        c = new Point(680,480),
        halfA,
        halfB,
        halfC;
int width;
public DrawTriangle() {
    super("Sierpinski Fractal");
    addWindowListener( new WindowAdapter() {
      public void windowClosing( WindowEvent we ) {
        dispose();
        System.exit( 0 );
    setBackground( Color.white );
    setSize(700, 500);
    setVisible(true);
public void paint(Graphics g)
paint(g, a, b, c);
public void paint(Graphics g, Point a, Point b, Point c) {
    width = c.x - a.x;
    if (width < 6){return;}
    halfA = new Point((a.x+b.x)/2, (a.y+b.y)/2);
    halfB = new Point((a.x+c.x)/2, (a.y+c.y)/2);
    halfC = new Point((b.x+c.x)/2, (b.y+c.y)/2);
    g.setColor( Color.GREEN ); //draw left triangle in green
    g.drawPolygon( new int[] { a.x, halfA.x, halfB.x }, new int[] { a.y, halfA.y, halfB.y }, 3 );
    g.setColor( Color.RED ); //draw top triangle in red
    g.drawPolygon( new int[] { b.x, halfA.x, halfC.x }, new int[] { b.y, halfA.y, halfC.y }, 3 );
    g.setColor( Color.BLUE ); //draw right triangle in blue
    g.drawPolygon( new int[] { c.x, halfB.x, halfC.x }, new int[] { c.y, halfB.y, halfC.y }, 3 );
    /*If you were to comment our two of these paint() calls the one will work correctly alone.
     *But my problem is that they do not work together! */
    //g, left point, top point, right point
    paint(g, halfA, b, halfC); //top triangle
    paint(g, halfC, halfB, c); //right triangle
    paint(g, a, halfA, halfB); //left triangle
public static void main(String[] args) {
     new DrawTriangle();
}

Confused about how to display a rectangle on JFrame

i'm a little confused about how to display a rectangle on a jframe.
I know there is a class called Rectangle. is there a way to use it to display a rectangle on a JFrame? i couldn't find a way to do that.
i found a way to display a rectangle in the internet:
CODE:
public class RectangleFrame extends JFrame {
    public RectangleFrame() {
        super("My Rectangle");
        setSize(300,400);
        setLocation(300,300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        JButton button = new JButton("Button");
        JPanel panel = new JPanel();
        panel.add(button);
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(new Rect(), BorderLayout.CENTER);
        getContentPane().add(panel, BorderLayout.SOUTH);
        setVisible(true);
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        new RectangleFrame();
public class Rect extends JComponent {
    public void paint(Graphics g) {
        g.drawRect(50,50,200,200);
}is this the only way to do that? isn't there an easier way? do i have to write this new class Rect i wrote?
i don't really know how this Rect class i wrote works. could someone explain?
then another question: can i put a rectangle on a JPanel or do i have to add it directly onto the ContentPane as i did above?
i hope everything i asked is clear enough.
thanks for your effort.

Take a look at the 2D graphics tutorial:
http://java.sun.com/docs/books/tutorial/2d/index.html

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How to use protected method in jsp code

Could anyone tell me how to use protected method in jsp code ...
I declare a Calendar class , and I want to use the isTimeSet method ,
But if I write the code as follows ..
========================================================
<%
Calendar create_date = Calendar.getInstance();
if (create_date.isTimeSet) System.out.println("true");
%>
============================================================
when I run this jsp , it appears the error wirtten "isTimeSet has protected access in java.util.Calendar"

The only way to access a protected variable is to subclass.
MyCalendar extends Calendar
but I doubt you need to do this. If you only want to tell if a Calendar object has a time associated with it, try using
cal.isSet( Calendar.HOUR );

How to use protected method of a class in application

Hi,
will u please tell me how to use protected method of class in application. (class:cl_gui_textcontrol, method:limit_text)
Thanks in advance,
Praba.

Hi Prabha,
You can set the maximum number of characters in a textedit control in the CREATE OBJECT statement itself.
Just see the first parameter in the method . I mean MAX_NUMBER_CHARS. Just set that value to the required number.
Eg:
data: edit type ref to CL_GUI_TEXTEDIT.
create object edit
exporting
    MAX_NUMBER_CHARS       = 10
   STYLE                  = 0
   WORDWRAP_MODE          = WORDWRAP_AT_WINDOWBORDER
   WORDWRAP_POSITION      = -1
   WORDWRAP_TO_LINEBREAK_MODE = FALSE
   FILEDROP_MODE          = DROPFILE_EVENT_OFF
    parent                 = OBJ_CUSTOM_CONTAINER
   LIFETIME               =
   NAME                   =
EXCEPTIONS
    ERROR_CNTL_CREATE      = 1
    ERROR_CNTL_INIT        = 2
    ERROR_CNTL_LINK        = 3
    ERROR_DP_CREATE        = 4
    GUI_TYPE_NOT_SUPPORTED = 5
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IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
           WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
In this case, the max: number of characters will be set to 10.
I hope your query is solved.
Regards,
SP.

How to use protect and protect

how to use protect and endprotect for two different element.
iam using one element for 'tax' and one for 'item total'
i wnt to print two elements in one page only.

Hi
What does 'Elements' mean for u?
Text Elements?
You can try to manage it in print program:
CALL FUNCTION 'CONTROL_FORM'
EXPORTING
    COMMAND = 'PROTECT'.
CALL FUNCTION 'WRITE_FORM'
EXPORTING
    ELEMENT = 'ELEMENT1'.
CALL FUNCTION 'WRITE_FORM'
EXPORTING
    ELEMENT = 'ELEMENT2'.
CALL FUNCTION 'WRITE_FORM'
EXPORTING
    ELEMENT = 'ELEMENTN'.
CALL FUNCTION 'CONTROL_FORM'
EXPORTING
    COMMAND = 'ENDPROTECT'.
Max

How to use Protected event CLICK_ROW_COL of cl_gui_alv_grid.

I've worked with Double_click,Hotspot_click events of Cl_gui_alv grid class quite comfortable as they are Public.
But i'm unable to work with click_row_col..
Could u tell me how to use protected event click_row_col..

Hi Ilayarajaramana
Did you try to build up a subclass of cl_gui_alv_grid and access the protected events via the subclass?
You could e.g. throw an own public event every time the click_row_col event is risen.
I know this isn't the best way, but it should work.
Kind Regards,
Sebastian

Not sure how to use protected method in arraylisy

Hi,
Im wondering how to use the removeRange method in java arraylist, its a protected method which returns void.
http://java.sun.com/j2se/1.3/docs/api/java/util/ArrayList.html#removeRange(int,%20int)
So if my class extends Arraylist i should be able to call the method but the compiler states that it still has protected access in arraylist. Does this mean im still overriding the method in arraylist ? A little explanation of whats happeneing would be appreciated as much as an answer
thanks

In this codefinal class myClass extends java.util.ArrayList {
    private ArrayList array = new ArrayList();
    public myClass(ArrayList ary){
        for(int i=0;i<7;i++) {
            array.add(ary.get(i));
        ary.removeRange(0,7)
}You are defining a class called myClass which extends ArrayList.
You have a member variable called array which is an ArrayList
You have a constructor which takes a parameter called ary which is an ArrayList
Since ary is an ArrayList, you cannot call it's removeRange() method unless myClass is in the java.util package. Do not put your class in the java.util package.
It seems like what you want to do is to move the items in one ArrayList to another ArrayList rather than copying them. I wrote a program to do this. Here it isimport java.util.*;
public class Test3 {
public static void main(String[] args) {
    MyClass myClass = new MyClass();
    for (int i=0; i<5; i++) myClass.add("Item-"+i);
    System.out.println("------ myClass loaded -------");
    for (int i=0; i<myClass.size(); i++) System.out.println(myClass.get(i));
    MyClass newClass = new MyClass(myClass);
    System.out.println("------ newClass created -------");
    for (int i=0; i<newClass.size(); i++) System.out.println(newClass.get(i));
    System.out.println("------ myClass now contains -------");
    for (int i=0; i<myClass.size(); i++) System.out.println(myClass.get(i));
class MyClass extends java.util.ArrayList {
    public MyClass() {}
    public MyClass(MyClass ary){
        for(int i=0;i<ary.size();i++) add(ary.get(i));
        ary.removeRange(0,ary.size());
}You should notice now that I don't create an ArrayList anywhere. Everything is a MyClass. By the way, class names are normally capitalized, variable names are not. Hence this line
MyClass myClass = new MyClass();
In the code above I create an empty MyClass and then populate it with 5 items and then print that list. Then I create a new MyClass using the constructor which takes a MyClass parameter. This copies the items from the parameter list into the newly created MyClass (which is an ArrayList) and then removes the items from the MyClass passed as a parameter. Back in the main() method, I then print the contents of the two MyClass objects.
One thing which may be a little confusing is this line.
for(int i=0;i<ary.size();i++) add(ary.get(i));
the add() call doesn't refer to anything. What it really refers to is the newly created MyClass object which this constructor is building. This newly created object is the 'this' object. So the line above could be rewritten as
for(int i=0;i<ary.size();i++) this.add(ary.get(i));
Hopefully this helps a little. The problems you seem to be having are associated with object oriented concepts. You might try reading this
http://sepwww.stanford.edu/sep/josman/oop/oop1.htm

Confusion about how JSP application compile

Hi,
I am develop a web application using JSP. The application includes many .jsp files and many JavaBeans files in order to accomplish multiple tasks. I feel confused that how all this jsp file and JavaBeans compile together. For say, if the user wants to create a new record, which is only one of all tasks, I assume that when user submit this request, the related jsp files and javaBeans instead of all jsp files and javaBeans, will load into memory and compile together into a servlet class, then according to the form data to do whatever they need to do to create a new record. When a request regarding another task come, another group of related jsp file and JavaBeans will compile to another servlet class to do the job and so on and so forth. Am I right about how they work? Or are all jsp files and javaBeans compile together instead of grouped by task into one servlet class? Which one is true?
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This is the way I see it happening (simplified)
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In summary, the phrase in your quote "the files that make up the application are all translated together..." is misleading. The translation only applies to the particular jsp file requested, and any that it includes with the include directive.
Cheers,
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How to use protect and endprotect in smart form

hi to all experts,
im still begineer in smart form , i have two headings like
company_code: purchase doc no:
after this i have a table to be displayed with four columns
what i want is the whole data should not be split by a page break
i know this can be achieved by using protect and end protect in sap scripts how to implement in smart form

probably u have the table inside a loop or a folder or something....
see this
Page protection attribute
Switch for page protection.
Use
Page protection switch.
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Page protection can extend to
a paragraph
a text node
all output within a folder, for example, several text nodes combined in this folder.
a line type (table node)
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in the table node..goto tables tab and click the details tab-->select the line type and check the 'no page break'
check box

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Confusing about how to use "protected"

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