Using this as String reference

Hi friends,
Can anybody help find my mistake in the following code.?
public class ThisCheck
{ public ThisCheck()
{System.out.printf("%s",this);
public String str()
{return "shiva";
public static void main(String a[])
{ ThisCheck the=new ThisCheck();
the output I am expecting is Shiva.
But the output Iam getting is the address of the object ThisCheck
as ThisCheck@7d772e
What's going wrong?
I appreciate ur help.

A: using this as String reference

Try:public class ThisCheck {
    public ThisCheck() {
        System.out.printf("%s", this);
    public String toString() {
        return "shiva";
    public static void main(String a[]) {
        ThisCheck the = new ThisCheck();
}The %s flag in printf() looks for the toString() method of the corresponding
argument. (Details here: http://java.sun.com/j2se/1.5.0/docs/api/java/util/Formatter.html)
When you post it's a good idea to use the Formatting tips
http://forum.java.sun.com/help.jspa?sec=formatting
Basically it means putting [code] at the start of your code and [/code] at
the end.

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Regards

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check this link ,
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thanks
Paul

Besides using the this reference for instance variables that have the same name as a local variable, it is also used when your class implements an interface and uses it in the class. Let me further explain. Lets pretend that you create a JFrame that has buttons on it. You want your buttons to handle events so you add an ActionListener to the buttons. You also want to code your event handling in the JFrame so you cause your JFrame to implement the ActionListener interface and implement the required method actionPerformed() in your JFrame class. Well, when you add and actionListener to the buttons, you have to use the this reference in the method signature. See code for example.import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class ExampleJFrame extends JFrame implements ActionListener {
   public ExampleJFrame() {
      super("Example using 'this' reference!");
      Container c = getContentPane();
      JButton button = new JButton("Push Me");
      /* Here is the example of how the 'this' reference is
         used. Since this class implements ActionListener,
         that means it is an ActionListener. So, when
         we add the method addActionListener to the button,
         it requires that an ActionListener be put into
         the method signature. So, I just pass a reference
         to this class into it (using the 'this' reference).
         Its actionPerformed method will be called. There
         are 3 ways I could think of to handle the
         events for this button. One is to do it the way
         I chose to do it; that is, have the originating
         class (ExampleJFrame) handle it. That is where
         the 'this' reference comes into play. Two is
         to use an anonymous inner class. The second
         option is useful if the code is small and
         self contained. Three is to have another
         class handle it, such as an Action. */
      button.addActionListener(this);
      c.add(button);
      /* incidentally, you could put the this keyword in
         front of each of these methods for readability,
         but most people don't. I used it on the first
         one to demonstrate it. */
               //cause the program to end when closing
      this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      pack();
      setVisible(true);
   }//end constructor
   /*=**************************************************
   * actionPerformed(): required ActionListener method *
   public void actionPerformed(ActionEvent e) {
      /* the this reference is also used in here because
         the showMessageDialog() should have as its
         parent a component and we want the component to
         be this JFrame */
      JOptionPane.showMessageDialog(this,"You used the this pointer!");
   }//end actionPerformed
   public static void main(String args[]) {
      /* when you run this class, a small JFrame with
         a button will appear in the top left corner. */
      ExampleJFrame app = new ExampleJFrame();
   }//end main
}//end ExampleJFrame classtajenkins

Posting string reference 961 not planned

Hi
From the output list of MB51, while I try to open a material document with Mvt Type 961(Backflush GI for Order), the system throws out a error "Posting string reference 961 not planned".
The same error appears when I try to access from Production Order -> Documented Goods Mvt -> Material document (with 961 Mvt).
Material documents is displayed for all other Mvt types.
Why is it so happening?
Thanks
Velu

Dear Velu,
Please check SE16 transaction:
Table: T156
BWART BUSTR
961 961 <<<<<<<<<<<<
This is the reason for the error message you are facing.
After 4.6A version, it is not possible to create custom movement type
by using a custom posting string reference.
Possible solution:
1) Deleting the movement and recreating the movement again in
 reference to a standard movement. This is the best and recommendable
 way.
2) Use SE16 and manually change the reference movement to a standard
 movement.
3) Release 470 has additional table MIGO_T156 that has to be updated if you want to continue using a customer movement type that does not reference a standard movement in T156 but i think you have to tested it out as it is not supported by SAP Support, this is modification. Keep fields XTRANSFER_MVT,
XSTOCK_TYPE_MVT, XREMOVE_FROM_MVT and XPLACE_IN_MVT as initial.
Regards,
ian Wong Loke Foong

Get string inside brackets - Using Scan from string

I have a very basic question here. I would like extract a portion of a string which is inside brackets (Example: I work with [National Instruments]). In the string I only want to extract National Instruments, I do know logic to extract by finding the brackets and extracting them. But I am interested in using the Scan from string or possibly any other primitive in one shot. Please suggest if anyone has any idea, I am really not use to the format specifiers. I got this link for reference but I am not able to figure out a solution.
The best solution is the one you find it by yourself
Solved!
Go to Solution.

Hi,
I cannot say that it is the best solution, I use two Scan From String functions instead of one but it does work, so far ;-)
I use Characters in set.
I could not attach VI so FP is below.
Duri

Use Operator == for String Comparison

Hi,
I would like to know more about the impact of using operator == in String Comparison.
From the reference I get, it state this :
"Operator (==) compares two object addresses to see whether it refers to the same object."
I've tested it with 2 codes as below :
Code 1:
          String Pass1 = "cosmo";
          String Pass2 = "cosmo";
if (Pass1==Pass2)
               System.out.println("1&2:same");
          else
               System.out.println("1&2:not same");
Output : 1&2:same
Code 2:
          String Pass3 = new String("cosmo");
          String Pass4 = new String("cosmo");
          if (Pass3==Pass4)
               System.out.println("3&4:same");
          else
               System.out.println("3&4:not same");
Output : 3&4:not same
Can anyone kindly explain why is the result so? If operator == compares the addresses, isn't it that the 1st code should also have the output :"1&2:not same".

Can anyone kindly explain why is the result so?It's an implementation artifact. Strings are pooled internally and because of that any String literal will be represented by exactly one object reference.
Knowledge of this shouldn't be utilized though. It's safer to follow the basic rule: Use == to compare object references and equals to compare object values, such as String literals.

String reference equality

I don't understand why following code when executed returns false
String s1= " string".trim();
if(s1 == "string"){
System.out.println("true");
else{
System.out.println("false");

In this case the strings are located in the String pool and are the same reference.
It stops working, when you use
String s1 = new String("String");
String s2 = new String("String");
System.out.println(s1 ==s2);
Just stop using == when comparing Strings, unless you wnat to compare the objects.

Practical uses of Weak/Soft references

Hello,
I understand how weak- and soft-references behave. However I would be grateful if someone could give me a practical example of why one would use them in a real-life application.
Thanks in advance,
Julien.

SourceError, seems like what you described in your last post is what I described in my post. see for yourself.
package com.rigidsoftware.Automotive.ASCAD.DataBase;
import java.lang.ref.*;
import java.util.*;
* This class is used to ensure that if anyone holds a particular DBObject, everyone
* that looks for that object gets a reference to the exact same instance. That
* way any name changes are immediately reflected in the data of the object.
* Of course that does not cause them to realize it...But since they all hold the
* reference, a listener should be easy!?
* The purpose of this cache is not speed but consistency of data. This is a
* form of the Singleton pattern, Multiton.
* Why wont a weak map or weak set work? do they only work for the keys and not
* the objects? probably do.
* Title: ASCAE
* Description: Automotive Systems Computer Aided Engineering Tool
* Copyright: Copyright (c) 2001
* Company: Rigidsoftware
* @author C.L. Gilbert
* @version 1.0
class DBCacher {
 private volatile Map m_Cache;
 private volatile Map m_ReverseCacheMapping; //cant think of any other way to remove values without keys.
 private volatile java.lang.ref.ReferenceQueue q;
 private volatile String name;//unsure if this ensures no NPE in case of thread starting before name assignment because optimizing compiler
 public DBCacher(String name){
 this.name = name;
 m_Cache = new HashMap();
 m_ReverseCacheMapping = new HashMap();
 q = new ReferenceQueue();
 Thread t = new CacheCleaner(name);
 int priority = Thread.currentThread().getPriority()-1; //slightly reduce the priority
 t.setPriority( (priority < Thread.MIN_PRIORITY) ? Thread.MIN_PRIORITY : priority );
 t.setDaemon(true);
 t.start();
 public DBCacher(){
 this("DBCacher");
 * Needs to by synchronized because of concurrent access to ReferenceQuque
 * and Map.
 public synchronized void CachePut(Object key,Object obj) {
 Reference r = new SoftReference(obj,q);
 m_Cache.put(key,r);
 m_ReverseCacheMapping.put(r,key);
 * key is the Long ID of the object typically
 public synchronized Object CacheGet(Object key){
 SoftReference sr = (SoftReference)m_Cache.get(key);
 if(sr != null) {
 System.out.println(name + " cache hit " + key);
 return (sr != null) ? sr.get() : null;
 private class CacheCleaner extends Thread {
 public CacheCleaner(String name){
 super(name);
 public void run() {
 while(true) {
 try {
 Reference ref = q.remove();
 Object value;
 Object key;
 synchronized(DBCacher.this) {
 key = m_ReverseCacheMapping.remove(ref);
 value = m_Cache.remove(key);
 java.lang.System.out.println(name + " removed object from map " + key);
 catch(InterruptedException ie){
 ie.printStackTrace();
}Each of my db object classes can only be obtained through an instance of this class by calling
instance.CacheGet( recordID );
and if no object is returned, then one is created externally and put into the cache with
instance.CachePut(object, recordID);
if your ids were more detailed you could use fewer instances of this class.
I wish I could find a way to get rid of that reverse cache lookup mess, but I could not. Feel free to use this code if its helpful.

Using this as String reference

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