Difference between .equals("") and .equals(null)

Can any one please tell me the difference between the following?
String someString;
someString = someMethod(someParameter);
After the method call, if I am going for a check like this..
what will each check do?
1. if (someThing.equals(null))
2. if (someThing.equals(""))
3. if (something == null )
4. if (something == "" )
Thanks in advance,
Regards
Rakesh

First, understand that the empty string ("") and null are two very different things. The empty string ("") is a string object that just doesn't contain any characters. It's still an object though--you can call it's methods.
Null, on the other hand, is essentailly nothing. It's a special value that means "Nothing. No object here." (Ignoring for now the distinction among the null type, a null reference, etc.) You can't call methods or refer to fields on null. If you try, you'll get a NullPointerException.
1. if (someThing.equals(null))Calls the equals method on someThing to compare someThing to null. If someThing is not null, this returns false. If someThing is null it... what? returns true? Nope. Throws NullPointerException. You can't call the equals method on a null someThing.
Therefore there's no point in ever using equals(null).
2. if (someThing.equals(""))Calls the equals method on someThing to compare someThing to the empty string (""). If someThing is not null, but is empty, it returns true. If someThing is non-null and is not empty (e.g., "abc"), it returns false. If someThing is null, it throws NPE.
One generally uses the equals method, not the == operator to compare objects--that is, to see if their contents or states are equal. The == operator is used to see if two referecnes refer to the same object, or if a reference is null.
3. if (something == null ) Evaluates to true if something is null and to false if something is non-null. Never throws NPE (since we're not calling a method or accessing a field).
4. if (something == "" ) You never really want to use == to compare a String variable to a String literal like this. This checks to see if the reference something is referring to the same object as the "" is. The "" will be referring to an object in the constant pool. Even if something is the empty string, it may not refer to the same entry in the constant pool.
That is (something == "") could evaluate to false, but something.equals("") could return true.

Similar Messages

Difference between rollback and issue_rollback(null)

In key-Next-Item i kept issue_rollback(null) command,then application working fine.but when i keep just normal rollback command in the same place,it showing do u want to save changes message on my front_end application.
So can any one tell that what is the diffrence between the normal ROLLBACK command and issue_rollback(null) procedure.

Since the documentation warns against using Issue_Rollback outside of an On-Rollback trigger, it may not be doing anything.
The plain rollback statement is interpreted by Forms as a Clear_Form with no parameters (which means using the default parameter values, which means it is doing a Clear_Form(Ask_commit,To_savepoint).
If you really want to undo any changes already made by the user when he hits the Tab or Enter key, you should issue the Clear_Form with the proper parameters. And then you have the issue of re-querying the data.
Maybe you should explain what you really want to happen in the trigger.

Difference between String=""; and String =null

I want to know the difference especially the ADVANTAGE between the following-
1. String s="";
String s="ABC"
and
String s;
String s="ABC";
or String s=null;
String s="ABC";
2. Object anyObject;
anyObject-new Object();
and
Object anyObject=null;
anyObject=new Object();

Tanvir007 wrote:
I want to know the difference especially the ADVANTAGE between the following-
1. String s="";s points to the empty string--the String object containing no characters.
String s="ABC"s points to the String object containing the characters "ABC"
String s; Declares String reference varialbe s. Doesn't not assign it any value. If it's a local variable, it won't have a value until you explicitly assign it. If it's a member variable, it will be given the value null when the enclosing object is created.
String s="ABC";Already covered above.
or String s=null;s does not point to any object.
String s="ABC";???
You've already asked this twice.
Are you talking about doing
String s = null;
String s = "ABC";right after each other?
You can't do that. You can only declare a variable once.
If you mean
String s = null;
s = "ABC";It just does what I described above, one after the other.
2. Object anyObject;
anyObject-new Object();
and
Object anyObject=null;
anyObject=new Object();As above: In the first case, its value is undefined until the new Object line if it's a local, or it's null if it's a member.
As for which is better, it depends what you're doing.

The different between Contain and equals

I not sure about the different between contain and equals if I want to know if the string have some character or not ?
thankyou

HJava wrote:
Thank you for all the reply,
I have if (myTYpe.substring(0).contains(""u") ) work
if if (myTYpe.substring(0).equals(""u") ) not work
so I post this question, may be I made other mistake
Thank youIf you wanted to see if the first character of the string was u then it is either
myTYpe.charAt(0) == 'u'or startWith("u") or matches("^u.*$") etc, etc, etc.
substring(0) will return the entire String, of course, which you would know if had actually looked at the API docs to find out what it did or even simply printed out the result to see what it did. Seemingly, however, you simply assumed you knew what it did and went on with that false assumption without bothering to even attempt to verify even though it was, already, not producing the results you expected. Instead, you focused on "the difference between contains and equals" which is self-evident in their names and obviously not the problem to begin with.

Difference between -1 and null in the targettype filed

Hi
Could anyone advise what is the difference between -1 and null in the targettype filed in marketing documents?
For example, in Sales Quotation - Rows (QUT1) table, I found for some open sales quotations, the field is null however the DB help file suggest the default value is -1 so I suppose it should be -1 for open documents.
Many thanks for your advisory.

Hi, Qian!
I investigated that "-1" value appears in targettype field in Sales Quotation Rows (QUT1 table) when you Dublicate a Sales Quotation document (Ctrl + D). And NULL value appears when you create a new document without dublicating.
In case you want to equal these 2 "empty"-values using T-SQL, you can use ISNULL(targettype, -1) function - this will give you -1 for both the "empty"-values
HTH!
Message was edited by: Aleksey Kuznetsov

Difference between void and null?

wht is da difference between void and null w.r.t java?

corlettk wrote:
Why do you care, unless you're implementing a java compiler or JVM?Wow, you sure do suck at helping out in a forum. Why even make this post? You're not helping the OP any, and you made yourself look like a tool.
To the op:
Null is java's version of a null value. Java's version is more strict then many other languages, and will not work in a boolean expression or anywhere code expects a real and not null value. It's simply null.
Void is java's way of declaring no return type on a method. Methods that are void take no 'return' statement and if one is provided will cause a fatal error. The exception to this is using 'return' without a value, which returns control to the caller of the method.
Observe:
//this method returns an int
public int return_int(){
    int value = 5;
    return value;
//this method does not return an int
public void return_nothing(){
    int another_value = 123;
    System.out.println("Here's the value: " + return_int());
//this method does not return anything
public void nothing_returned(){
    return_nothing();
    return;
    System.out.println("This line never gets printed; the method returned control already!");
}

Differences between awt and swing

Ive written the following code, however Ive implemented the gui in awt rather then swing. Ive been told it hs too be in swing. What is the difference between swing and awt what will I need to change in my program so that its done using swing rather then the awt? Heres the code:
// pp.java
// Grant Brown
// 22/02/02
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
// =========================================================
// Class: pp
// This class drives the customer manager. It contains the
// main method which gets called as soon as this application
// begins to run.
// =========================================================
class pp extends Frame implements ActionListener
// Container of customer objects
private Vector customers = new Vector (100);
// List of names component. (Must specify java.awt in
// front of List to distinguish the List class in the
// java.awt package from the List class in the java.util
// package.)
private java.awt.List names = new java.awt.List ();
// Delete and update button components.
private Button delete;
private Button update;
// Default constructor.
public pp ()
// Assign "Paper Round Manager" to title bar of frame window.
super ("Paper Round Manager");
// Add a listener that responds to window closing
// events. When this event occurs (by clicking on the
// close box in the title bar), save customers and exit.
addWindowListener (new WindowAdapter ()
public void windowClosing
(WindowEvent e)
saveCustomers ();
System.exit (0);
// Place an empty label in the north part of the frame
// window. This is done to correct an AWT positioning
// problem.
Label l = new Label ();
add ("North", l);
// Place the names component in the center part of the
// frame window.
add ("Center", names);
// Create a panel object to hold four buttons.
Panel p = new Panel ();
Button b;
// Add an Insert button to the Panel object and register
// the current pp object as a listener for button events.
p.add (b = new Button ("Insert"));
b.addActionListener (this);
// Add a Delete button to the Panel object and register
// the current pp object as a listener for button events.
p.add (delete = new Button ("Delete"));
delete.addActionListener (this);
// The Delete button should be disabled until there is at
// least one customer to delete.
delete.setEnabled (false);
// Add an Update button to the Panel object and register
// the current pp object as a listener for button events.
p.add (update = new Button ("Update"));
update.addActionListener (this);
// The Update button should be disabled until there is at
// least one customer to update.
update.setEnabled (false);
// Add a Finish button to the Panel object and register
// the current customer object as a listener for button events.
p.add (b = new Button ("Finish"));
b.addActionListener (this);
// Add the panel object to the frame window container.
add ("South", p);
// Set the background of the frame window container to
// lightGray
setBackground (Color.lightGray);
// Set the size of the frame window container to 400
// pixels horizontally by 200 pixels vertically.
setSize (400, 200);
// Allow the user to resize the frame window.
setResizable (true);
// Load all contacts.
loadCustomers ();
// Make sure that the frame window is visible.
setVisible (true);
public void actionPerformed (ActionEvent e)
if (e.getActionCommand ().equals ("Delete"))
delete ();
else
if (e.getActionCommand ().equals ("Finish"))
saveCustomers ();
System.exit (0);
else
if (e.getActionCommand ().equals ("Insert"))
insert ();
else
update ();
public Insets getInsets ()
// Return an Insets object that describes the number of
// pixels to reserve as a border around the edges of the
// frame window.
return new Insets (10, 10, 10, 10);
public static void main (String [] args)
// Create a new pp object and let it do its thing.
new pp ();
private void delete ()
// Obtain index of selected contact item from the names
// component.
int index = names.getSelectedIndex ();
// If no item was selected, index is -1. We cannot update
// a contact if no contact item in the names component was
// selected - because we would have nothing to work with.
if (index != -1)
// Remove the contact item from the names component.
names.remove (index);
// Remove the Customer object from the contacts Vector
// object.
customers.remove (index);
// If there are no more customers ...
if (customers.size () == 0)
delete.setEnabled (false);
update.setEnabled (false);
else
// Make sure that the first contact item in the names
// list is highlighted.
names.select (0);
private void insert ()
// Create an Insert data entry form to enter information
// for a new customer.
DataEntryForm def = new DataEntryForm (this, "Insert");
// If the bOk Boolean flag is set, this indicates the user
// exited the form by pressing the Ok button.
if (def.bOk)
// Create a Contact object and assign information from
// the form to its fields.
Customer temp = new Customer ();
temp.name = new String (def.name.getText ());
temp.publication = new String (def.publication.getText ());
temp.round = new String (def.round.getText ());
temp.address = new String (def.address.getText ());
temp.phone = new String (def.phone.getText ());
// Add a new customer item to the names component.
names.add (temp.name + ", " + temp.publication);
// Add the Customer object to the contacts Vector
// object.
customers.add (temp);
// Make sure that the Delete and Update buttons are
// enabled.
delete.setEnabled (true);
update.setEnabled (true);
// Destroy the dialouge box.
def.dispose ();
// Make sure that the first customer item in the names list
// is highlighted.
names.select (0);
// ===========================================================
// Load all contacts from contacts.dat into the contacts
// Vector object. Also, make sure that the last name/first
// name from each contact is combined into a String object and
// inserted into the names component - as a contact item.
// ===========================================================
private void loadCustomers ()
FileInputStream fis = null;
try
fis = new FileInputStream ("Customers.dat");
DataInputStream dis = new DataInputStream (fis);
int nCustomers = dis.readInt ();
for (int i = 0; i < nCustomers; i++)
Customer temp = new Customer ();
temp.name = dis.readUTF ();
temp.publication = dis.readUTF ();
temp.round = dis.readUTF ();
temp.address = dis.readUTF ();
temp.phone = dis.readUTF ();
names.add (temp.name + ", " + temp.publication);
customers.add (temp);
if (nCustomers > 0)
delete.setEnabled (true);
update.setEnabled (true);
catch (IOException e)
finally
if (fis != null)
try
fis.close ();
catch (IOException e) {}
// Make sure that the first contact item in the names list
// is highlighted.
names.select (0);
// ========================================================
// Save all Customer objects from the customer Vector object
// to customer.dat. The number of customerss are saved as an
// int to make it easy for loadCustomers () to do its job.
// ========================================================
private void saveCustomers ()
FileOutputStream fos = null;
try
fos = new FileOutputStream ("customers.dat");
DataOutputStream dos = new DataOutputStream (fos);
dos.writeInt (customers.size ());
for (int i = 0; i < customers.size (); i++)
Customer temp = (Customer) customers.elementAt (i);
dos.writeUTF (temp.name);
dos.writeUTF (temp.publication);
dos.writeUTF (temp.round);
dos.writeUTF (temp.address);
dos.writeUTF (temp.phone);
catch (IOException e)
MsgBox mb = new MsgBox (this, "PP Error",
e.toString ());
mb.dispose ();
finally
if (fos != null)
try
fos.close ();
catch (IOException e) {}
private void update ()
// Obtain index of selected customer item from the names
// component.
int index = names.getSelectedIndex ();
// If no item was selected, index is -1. We cannot update
// a customer if no customer item in the names component was
// selected - because we would have nothing to work with.
if (index != -1)
// Obtain a reference to the customer object (from the
// customers Vector object) that is associated with the
// index.
Customer temp = (Customer) customers.elementAt (index);
// Create and display an update entry form.
DataEntryForm def = new DataEntryForm (this, "Update",
temp.name,
temp.publication,
temp.round,
temp.address,
temp.phone);
// If the user pressed Ok...
if (def.bOk)
// Update the customer information in the customers
// Vector object.
temp.name = new String (def.name.getText ());
temp.publication = new String (def.publication.getText ());
temp.round = new String (def.round.getText ());
temp.address = new String (def.address.getText ());
temp.phone = new String (def.phone.getText ());
// Make sure the screen reflects the update.
names.replaceItem (temp.name + ", " + temp.publication,
index);
// Destroy the dialouge box.
def.dispose ();
// Make sure that the first customer item in the names
// list is highlighted.
names.select (0);

Ive doen pretty much what you said burt now my program isnt working at all. The window comes up but instead of doing something when you click the button it just throws shit loads of exceptions. Heres my abridged code
// pp.java
// Grant Brown
// 22/02/02
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
// =========================================================
// Class:PP
// This class drives the Paper Round manager. It contains the
// main method which gets called as soon as this application
// begins to run.
// =========================================================
class pp extends JFrame implements ActionListener
// Container of customer objects (one object per customer)
private Vector customers = new Vector (100);
// List of names component. (Must specify java.awt in
// front of List to distinguish the List class in the
// java.awt package from the List class in the java.util
// package.)
private java.awt.List names = new java.awt.List ();
// Delete and update button components.
private JButton delete;
private JButton update;
// Default constructor.
public pp ()
// Assign Contact Manager to title bar of frame window.
super ("Paper Round Manager");
// Add a listener that responds to window closing
// events. When this event occurs (by clicking on the
// close box in the title bar), save contacts and exit.
addWindowListener (new WindowAdapter ()
public void windowClosing
(WindowEvent e)
saveCustomers ();
System.exit (0);
// Place an empty label in the north part of the frame
// window. This is done to correct an AWT positioning
// problem. (One thing that you'll come to realize as
// you work with the AWT is that there are lots of bugs.)
JLabel l = new JLabel ();
getContentPane().add ("North", l);
// Place the names component in the center part of the
// frame window.
getContentPane().add ("Center", names);
// Create a panel object to hold four buttons.
JPanel p = new JPanel ();
JButton b;
// Add an Insert button to the Panel object and register
// the current cm object as a listener for button events.
p.add (b = new JButton ("Insert"));
b.addActionListener (this);
// Add a Delete button to the Panel object and register
// the current cm object as a listener for button events.
p.add (delete = new JButton ("Delete"));
delete.addActionListener (this);
// The Delete button should be disabled until there is at
// least one contact to delete.
delete.setEnabled (false);
// Add an Update button to the Panel object and register
// the current cm object as a listener for button events.
p.add (update = new JButton ("Update"));
update.addActionListener (this);
// The Update button should be disabled until there is at
// least one contact to update.
update.setEnabled (false);
// Add a Finish button to the Panel object and register
// the current cm object as a listener for button events.
p.add (b = new JButton ("Finish"));
b.addActionListener (this);
// Add the panel object to the frame window container.
getContentPane().add ("South", p);
// Set the background of the frame window container to
// lightGray (to give a pleasing effect).
setBackground (Color.lightGray);
// Set the size of the frame window container to 400
// pixels horizontally by 200 pixels vertically.
setBounds (50, 100, 400, 200);
// Do not allow the user to resize the frame window.
loadCustomers ();
// Load all contacts.
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Make sure that the frame window is visible.
setVisible (true);
public void actionPerformed (ActionEvent e)
if (e.getActionCommand ().equals ("Delete"))
delete ();
else
if (e.getActionCommand ().equals ("Finish"))
saveCustomers ();
System.exit (0);
else
if (e.getActionCommand ().equals ("Insert"))
insert ();
else
update ();
public Insets getInsets ()
// Return an Insets object that describes the number of
// pixels to reserve as a border around the edges of the
// frame window.
return new Insets (10, 10, 10, 10);
public static void main (String [] args)
// Create a new cm object and let it do its thing.
new pp ();
private void delete ()
// Obtain index of selected customer item from the names
// component.
int index = names.getSelectedIndex ();
// If no item was selected, index is -1. We cannot update
// a contact if no contact item in the names component was
// selected - because we would have nothing to work with.
if (index != -1)
// Remove the customer item from the names component.
names.remove (index);
// Remove the Customer object from the contacts Vector
// object.
customers.remove (index);
// If there are no more customers ...
if (customers.size () == 0)
delete.setEnabled (false);
update.setEnabled (false);
else
// Make sure that the first contact item in the names
// list is highlighted.
names.select (0);
private void insert ()
// Create an Insert data entry form to enter information
// for a new contact.
DataEntryForm def = new DataEntryForm (this, "Insert");
// If the bOk Boolean flag is set, this indicates the user
// exited the form by pressing the Ok button.
if (def.bOk)
// Create a Customer object and assign information from
// the form to its fields.
Customer temp = new Customer ();
temp.name = new String (def.name.getText ());
temp.publication = new String (def.publication.getText ());
temp.address = new String (def.address.getText ());
temp.round = new String (def.round.getText ());
temp.phone = new String
(def.phone.getText ());
// Add a new customer item to the names component.
names.add (temp.publication + ", " + temp.address);
// Add the Customer object to the contacts Vector
// object.
customers.add (temp);
// Make sure that the Delete and Update buttons are
// enabled.
delete.setEnabled (true);
update.setEnabled (true);
// Destroy the dialog box.
def.dispose ();
// Make sure that the first customer item in the names list
// is highlighted.
names.select (0);
// ===========================================================
// Load all customers from customers.dat into the customers
// Vector object. Also, make sure that the last name/first
// name from each contact is combined into a String object and
// inserted into the names component - as a contact item.
// ===========================================================
private void loadCustomers ()
FileInputStream fis = null;
try
fis = new FileInputStream ("customers.dat");
DataInputStream dis = new DataInputStream (fis);
int nCustomers = dis.readInt ();
for (int i = 0; i < nCustomers; i++)
Customer temp = new Customer ();
temp.name = dis.readUTF ();
temp.publication = dis.readUTF ();
temp.address = dis.readUTF ();
temp.round = dis.readUTF ();
temp.phone = dis.readUTF ();
names.add (temp.publication + ", " + temp.address);
customers.add (temp);
if (nCustomers > 0)
delete.setEnabled (true);
update.setEnabled (true);
catch (IOException e)
finally
if (fis != null)
try
fis.close ();
catch (IOException e) {}
// Make sure that the first customer item in the names list
// is highlighted.
names.select (0);
// ========================================================
// Save all customer objects from the contacts Vector object
// to customers.dat. The number of contacts are saved as an
// int to make it easy for loadCustomers () to do its job.
// ========================================================
private void saveCustomers ()
FileOutputStream fos = null;
try
fos = new FileOutputStream ("customers.dat");
DataOutputStream dos = new DataOutputStream (fos);
dos.writeInt (customers.size ());
for (int i = 0; i < customers.size (); i++)
Customer temp = (Customer) customers.elementAt (i);
dos.writeUTF (temp.name);
dos.writeUTF (temp.publication);
dos.writeUTF (temp.address);
dos.writeUTF (temp.round);
dos.writeUTF (temp.phone);
catch (IOException e)
MsgBox mb = new MsgBox (this, "PP Error",
e.toString ());
mb.dispose ();
finally
if (fos != null)
try
fos.close ();
catch (IOException e) {}
private void update ()
// Obtain index of selected customer item from the names
// component.
int index = names.getSelectedIndex ();
// If no item was selected, index is -1. We cannot update
// a customer if no customer item in the names component was
// selected - because we would have nothing to work with.
if (index != -1)
// Obtain a reference to the Customer object (from the
// customer Vector object) that is associated with the
// index.
Customer temp = (Customer) customers.elementAt (index);
// Create and display an update entry form.
DataEntryForm def = new DataEntryForm (this, "Update",
temp.name,
temp.publication,
temp.address,
temp.round,
temp.phone);
// If the user pressed Ok...
if (def.bOk)
// Update the customer information in the customers
// Vector object.
temp.name = new String (def.name.getText ());
temp.publication = new String (def.publication.getText ());
temp.address = new String (def.address.getText ());
temp.round = new String (def.round.getText ());
temp.phone = new String (def.phone.getText ());
// Make sure the screen reflects the update.
names.replaceItem (temp.publication + ", " + temp.address,
index);
// Destroy the dialog box.
def.dispose ();
// Make sure that the first customer item in the names
// list is highlighted.
names.select (0);
// ========================================================
// Class: Customer
// This class describes the contents of a business customer.
// ========================================================
class Customer
public String name;
public String publication;
public String address;
public String round;
public String phone;
// ==========================================================
// Class: DataEntryForm
// This class provides a data entry form for entering customer
// information.
// ==========================================================
class DataEntryForm extends JDialog implements ActionListener
// bOk is a boolean flag. When true, it indicates that
// the Ok button was pressed to terminate the dialog box
// (as opposed to the Cancel button).
public boolean bOk;
// The following components hold the text that the user
// entered into the visible text fields.
public JTextField name;
public JTextField publication;
public JTextField address;
public JTextField round;
public JTextField phone;
public void actionPerformed (ActionEvent e)
// If the user pressed the Ok button, indicate this
// by assigning true to bOk.
if (e.getActionCommand ().equals ("Ok"))
bOk = true;
// Destroy the dialog box and return to the point
// just after the creation of the DataEntryForm object.
dispose ();
public DataEntryForm (JFrame parent, String title)
// Call the other constructor. The current constructor
// is used for insert operations. The other constructor
// is used for update operations.
this (parent, title, "", "", "", "", "");
public DataEntryForm (JFrame parent, String title,
String name, String publication,
String address, String round,
String phone)
// Initialize the superclass layer.
super (parent, title, true);
// Choose a grid bag layout so that components can be more
// accurately positioned. (It looks nicer.)
setLayout (new GridBagLayout ());
// Add appropriate first name, last name, phone, fax, and
// email components to the current DataEntryForm container.
// (Remember, DataEntryForm is a subclass of Dialog.
// Dialog is a container. Therefore, DataEntryForm
// inherits the ability to be a container.)
addComponent (this, new JLabel ("Name: "), 0, 0, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.WEST);
this.name = new JTextField (15);
addComponent (this, this.name, 1, 0, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.CENTER);
if (title.equals ("Update"))
this.name.setText (name);
addComponent (this, new JLabel ("Publications: "), 0, 1, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.WEST);
this.publication = new JTextField (15);
addComponent (this, this.publication, 1, 1, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.CENTER);
if (title.equals ("Update"))
this.publication.setText (publication);
addComponent (this, new JLabel ("Address "), 0, 2, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.WEST);
this.address = new JTextField (15);
addComponent (this, this.address, 1, 2, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.CENTER);
if (title.equals ("Update"))
this.address.setText (address);
addComponent (this, new JLabel ("Round No "), 0, 3, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.WEST);
this.round = new JTextField (15);
addComponent (this, this.round, 1, 3, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.CENTER);
if (title.equals ("Update"))
this.round.setText (round);
addComponent (this, new JLabel ("Phone Number "), 0, 4, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.WEST);
this.phone = new JTextField (15);
addComponent (this, this.phone, 1, 4, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.CENTER);
if (title.equals ("Update"))
this.phone.setText (phone);
addComponent (this, new JLabel (""), 0, 5, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.CENTER);
addComponent (this, new JLabel (""), 1, 5, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.CENTER);
JButton b;
// Add an Ok button to this container.
addComponent (this, b = new JButton ("Ok"), 0, 6, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.CENTER);
b.addActionListener (this);
// Add a Cancel button to this container.
addComponent (this, b = new JButton ("Cancel"), 1, 6, 1, 1,
GridBagConstraints.NONE,
GridBagConstraints.CENTER);
b.addActionListener (this);
// Set the size of the dialog window to 250 pixels
// horizontally by 200 pixels vertically.
setSize (250, 200);
// Do not allow users to resize the dialog window.
setResizable (false);
// Make sure that the dialog window is visible.
setVisible (true);
private void addComponent (Container con, Component com,
int gridx, int gridy,
int gridw, int gridh, int fill,
int anchor)
// Get the current layout manager. It is assumed to
// be a GridBagLayout object.
LayoutManager lm = con.getLayout ();
// Create a GridBagConstraints object to make it
// possible to customize component positioning.
GridBagConstraints gbc = new GridBagConstraints ();
// Assign the x and y grid positions.
gbc.gridx = gridx;
gbc.gridy = gridy;
// Assign the number of grid blocks horizontally and
// vertically that are occupied by the component.
gbc.gridwidth = gridw;
gbc.gridheight = gridh;
// Specify the component's resize policy (fill) and
// the direction in which the component is positioned
// when its size is smaller than available space (anchor).
gbc.fill = fill;
gbc.anchor = anchor;
// Set the new constraints that the grid bag layout
// manager will use.
((GridBagLayout) lm).setConstraints (com, gbc);
// Add the component to the container.
con.add (com);
// ===========================================================
// Class: MsgBox
// This class displays a message box to the user. The message
// is usually an error message. The user must press the Ok
// button to terminate the message box.
// ===========================================================
class MsgBox extends JDialog implements ActionListener
public void actionPerformed (ActionEvent e)
// Terminate the dialog box in response to the user
// pressing the Ok button.
dispose ();
public MsgBox (JFrame parent, String title, String msg)
// Initialize the superclass layer.
super (parent, title, true);
// Store the msg argument in a Label object and add
// this object to the center part of the dialog window.
JLabel l = new JLabel (msg);
add ("Center", l);
// Create a Button object and add it to the south part
// of the dialog window.
JButton b = new JButton ("Ok");
add ("South", b);
// Make the current object a listener to events that
// occur as a result of the user pressing the Ok
// button.
b.addActionListener (this);
// Make sure that the Ok button has the focus.
b.requestFocus ();
// Do not allow users to resize the dialog window.
setResizable (false);
// Allow the layout manager to choose an appropriate
// size for the dialog window.
pack ();
// Make sure that the dialog window is visible.
setVisible (true);
}

Difference between CHAR and VARCHAR2 datatype

Difference between CHAR and VARCHAR2 datatype
CHAR datatype
If you have an employee name column with size 10; ename CHAR(10) and If a column value 'JOHN' is inserted, 6 empty spaces will be inserted to the right of the value. If this was a VARCHAR column; ename VARCHAR2(10). How would it handle the column value 'JOHN' ?

The CHAR datatype stores fixed-length character strings, and Oracle compares CHAR values using blank-padded comparison semantics.
Where as the VARCHAR2 datatype stores variable-length character strings, and Oracle compares VARCHAR2 values using nonpadded comparison semantics.
This is important when comparing or joining on the columns having these datatypes;
SQL*Plus: Release 10.2.0.1.0 - Production on Pzt Au 6 09:16:45 2007
Copyright (c) 1982, 2005, Oracle. All rights reserved.
SQL> conn hr/hr
Connected.
SQL> set serveroutput on
SQL> DECLARE
2 last_name1 VARCHAR2(10) := 'TONGUC';
3 last_name2 CHAR(10) := 'TONGUC';
4 BEGIN
5 IF last_name1 = last_name2 THEN
6 DBMS_OUTPUT.PUT_LINE ( '-' || last_name1 || '- is equal to -' || last_name2
|| '-');
7 ELSE
8 DBMS_OUTPUT.PUT_LINE ( '-' || last_name1 || '- is NOT equal to -' || last_n
ame2 || '-');
9 END IF;
10 END;
11 /
-TONGUC- is NOT equal to -TONGUC -
PL/SQL procedure successfully completed.
SQL> DECLARE
2 last_name1 CHAR(6) := 'TONGUC';
3 last_name2 CHAR(10) := 'TONGUC';
4 BEGIN
5 IF last_name1 = last_name2 THEN
6 DBMS_OUTPUT.PUT_LINE ( '-' || last_name1 || '- is equal to -' || last_name2
|| '-');
7 ELSE
8 DBMS_OUTPUT.PUT_LINE ( '-' || last_name1 || '- is NOT equal to -' || last_n
ame2 || '-');
9 END IF;
10 END;
11 /
-TONGUC- is equal to -TONGUC -
PL/SQL procedure successfully completed.
Also you may want to read related asktom thread - "Char Vs Varchar" http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1542606219593
and http://tahitiviews.blogspot.com/2007/05/less-is-more-more-or-less.html
Best regards.

T-Code for reporting stock quantity difference between IM and WM

Hi All
I'm probably going to kick myself for asking this quastion but is there a report to show the stock quantity differences between IM and WM?
I have searched the forum first but cannot find info.
We have various differences in IM and WM shown in MD04 and LS26. This is usually the result of an unplanned plant to plant transfer not being recipted in at the destination plant.
If no standard T-code is available, which tables can I join to create my own query?
Thanks in advance
Darren

compare MMBE with LS26
Make sure you dont enter a storage location and storage type in selection screen of LS26.
if you post a difference with LI20, then you have just posted a difference within WM, means you moved a quantity from a bin into the difference storate type 998. The balance of both is still equal to your stock shown in MMBE. You have to clear the difference with IM by executing LI21 transaction. Only then the quantity will disappear from difference storage type and will be adjusted in MM and FI.
LX23 will only report real inconstencies and will adjust them.
If you do a MM movement like 303, then this creates a transfer request in WM, this TR needs to be converted into a TO. to move the stock from the bin to the interim storage type for goods issue.
In your case you created just a negative quant in the interim storage type for goods issue and still have a positive quant in the bin, the balance is equal to the stock shown in MMBE.

How to calculate the difference between intdate and getdate

Hi,
My requirement is to get the data for all the claims where the difference between transactiondate and getdate() should be less than or equal to 7 which means any claims that happened in the past week.
So, my query would be something like this
select * from claims
where transactiondate-getdate < 8
But my transactiondate is in int format such as 20150331 and getdate would be in the format of 2015-03-31. Can someone please help me on how can i achieve the difference between these 2 date formats in the where clause.
Please let me know if you have any questions or if i am unclear.
Thanks

Hi SqlDev12,
Please find the below condition in your query,hope it would help you
DATEDIFF(DD,CAST(CAST(TransactionDate
AS
VARCHAR)
AS
DATETIME),GETDATE())
< 8
Thanks & Regards,
Praveena.

Differences between @EJB and @Resouce?

Hi,
I am confused about the differences between @EJB and @Resource?
1.
Can Session Beans be injected for both?
If so what are the pro's / con's?
2.
Are the any difference between the type of components that cna be registered for one but not the other?
3.
Are they both equally usable with the ENC?
Many thanks.

@EJBs are 'special' resources. For example, @EJB (for a stateful session bean) results in
1. Creation of the Stateful Session Bean,
2. Other dependencies are injected into this newly created bean,
3. If the bean has a @PostConstruct bean then that method is invoked (after invoking applicable interceptors)
Hope this helps

What is the difference between != and Logical NOT operator

kindly,tell me what is the difference between Not Equality operator and logical negation operator.
Edited by: user13414134 on Dec 3, 2010 8:59 AM

what is the difference between != and Logical NOT operator The NOT operator is transformed into the inequality operator (<>), as can be seen from the Predicate Information of the explain plan:
SQL> explain plan for select * from dual where :x != :y
Explain complete.
SQL> select * from table(dbms_xplan.display())
PLAN_TABLE_OUTPUT
Plan hash value: 3752461848
| Id | Operation          | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |      |     1 |     2 |     2   (0)| 00:00:01 |
|* 1 | FILTER            |      |       |       |            |          |
|   2 |   TABLE ACCESS FULL| DUAL |     1 |     2 |     2   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - filter(:Y<>:X)
14 rows selected.
SQL> explain plan for select * from dual where not :x = :y
Explain complete.
SQL> select * from table(dbms_xplan.display())
PLAN_TABLE_OUTPUT
Plan hash value: 3752461848
| Id | Operation          | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |      |     1 |     2 |     2   (0)| 00:00:01 |
|* 1 | FILTER            |      |       |       |            |          |
|   2 |   TABLE ACCESS FULL| DUAL |     1 |     2 |     2   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - filter(:Y<>:X)
14 rows selected.

Difference between Abort and Terminate

What is the difference between aborting and terminating a sequence?
Solved!
Go to Solution.

Create a sequence with some steps in the setup, some in the main and some in the clean-up stepgroup. You should also add a subsequence with an equal setup. Call this sub from a main step in the MainSequence.
Terminate/Abort at a step in the main stepgroup of the subsequence. Look into the report for the result.
Hint: Give unique names to your steps (statements) that you see with one blink of an eye from which stepgroup the steps are.
hope this helps,
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

Difference between SpSite and SpWeb

hello ,
I had an interview and I was Asked thsi Question :
   What is the difference between SpSite and SpWeb ?
    and which one in the SiteCollection ?
thanks

The problem lies with the difference in terms used between the SharePoint user-interface and the object model. When we are speaking to end-users, they are familiar with the term "creating SharePoint team sites". However, everytime you create a "site" from the UI, an SPWeb object was created.
It doesn't help that the MSDN documentation uses the following type of naming conventions in their code samples:
SPSite mySiteCollection = new SPSite("http://servername/");
SPWeb mySite = mySiteCollection.AllWebs["Site_Name"];
SPWeb myRootSite = mySiteCollection.RootWeb;
For me, it would have been much clearer if they wrote something like this instead:
SPSite mySite = new SPSite("http://servername/");
SPWeb myWeb = mySite.AllWebs["Site_Name"];
SPWeb myRootWeb = mySite.RootWeb;
While the description for SPSite may be valid, a typical SharePoint application web site only has onetop-level site collection. Therefore, in this url http://servername/site1/site1a/, there are actually three SPWeb objects, and only one SPSite object.
SPSite site1 = new SPSite("http://servername/site1/");
SPSite site1a = new SPSite("http://servername/site1/site1a/");
bool sitesAreEqual = site1.Equals(site1a); // sitesAreEqual should evaluate to true.
SPWeb web1 = site1.OpenWeb();
SPWeb web1a = site1a.OpenWeb();
SPWeb rootWeb = site1.RootWeb; // or site1a.RootWeb; would return same instance.
See the SPSite.OpenWeb() method for more examples: http://msdn2.microsoft.com/en-us/library/ms474633.aspx.
SPSite itself is not a "collection" in the sense that comes from CollectionBase, for example. In fact, both SPSite and SPWeb inherit directly from System.Object. Therefore, to use a name such as mySiteCollection is confusing/misleading.
The key thing to keep in mind is that as developers, we need to use the technically accurate terms when speaking with each other (even if MSDN doesn't), and reserve the marketing/UI terms when speaking with people who would never see the object model. (Note: there are examples of these kinds of terminology differences all over the place in SharePoint 2007.)
I hope this clears things up a bit...if you find something that is not correct/accurate, please let me know! some borns good, others make good

Difference between STATIC and FLOW CONTROL in IKM

Hello,
Can someone explain the difference between STATIC and FLOW control in IKM ? What is the best situation to use them with some example ?
Can we have more than one ODI Constraint at the target table.
Thanks
Edited by: cdmnagaraj on 19-Oct-2008 21:59

Hi Nagaraj,
Suppose your Lookup table -> column "VALUE" is 101.
How many rows in your source table (column) have "Balance" = 101 ??
I hope only One.
From your Source table all the recors will be moved to your I$ . then from your I$ it will check for the condition
and all the violated records will be moved to your E$
please check your "Insert CK Errors" from your operator
it will be like this....
insert into E$_TargetTable
     ERR_TYPE,
     ERR_MESS,
     CHECK_DATE,
     ORIGIN,
     CONS_NAME,
     CONS_TYPE,
     col1,
     col2,
     balance
select
     'F',
     sysdate,
     '(3367100)TESTPROJECTS.TestTable',
     'conditionTest',
     'CK',
     col1,
     col2,
     balance
from     I$_TargetTable CHI
where     not      (
          Balance = (Select value from LOOKUP)
So in your case it will check for balance not equal to 101 . and it will push those records into your E$ table
Rathish

Difference between element and identity based version

Can anybody tell me the difference between elment and identity based version of the Object with any example? which classes implement them?

Hunky322 wrote:
At first it struck me as odd, given how List, Set, and Map define equals, but the part the OP left off clears it up a bit: "..because element-based equality is not always well-defined for queues with the same elements but different ordering properties."This lineSo, you're saying you don't understand the following?
>
Queue implementations generally do not define element-based versions of the equals and hashCode methods but instead inherit the identity-based versions from Object because element-based equality is not always well-defined for queues with the same elements but different ordering properties.
>
Okay, here's the deal.
For a List, equals() is true if both Lists contain the same objects and in the same order. That's pretty straightforward, and it makes sense.
For a Set, equals() is true if both Sets contain the same objects. Order is not considered because Sets are not generally ordered. Again, this it straightforward.
So, you might think that Queue might define equals in a similar fashion--either if both Queues contain all the same elements, or if they contain all the same elements in the same order. However, this doesn't really work very well. Since ordering is an important part of a Queue, the ordering should be considered for equality. However, unlike Lists, two different Queues containing the same objects might define ordering differently. One might be a FIFO and the other might be a PriorityQueue, so how do you compare those two queues for equality?
There are no clear-cut rules for equality between two arbitrary Queues, so the Queue interface does not define an equals method that's related to the contents of the Queues.

Difference between .equals("") and .equals(null)

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