My first step in Java, please help me.

I've just installed J2SDK1.4.0_03 and I'm reading the first pages of the Java tutorial.
I've created a work folder : C:\Java
I'm working with an msdos session of windows 2000
I've created my first example class, prthello.java with NotePad :
class prthello{
public static void main(String args[]) {
System.out.println("Hello World!");
I've successful compilated it (javac prthello.java) and generated the prthello.class
I've tried to execute it (java prthello) but it doesn't work and i receive the following message :
Exception in thread "main" java.lang.NoClassDefFoundError: prthello
The path should be correct (C:\Programmi\j2sdk1.4.0_03\bin) ,
any suggestions would be appreciate.
Thanking in Advance
Andrea Giussani
Milano, Italy

Thank you for your suggestions, but i have already checked.
The path is ok, i've installed jsdk under folder "programmi" and the path is :
C:\>set path
Path=C:\WINNT\system32;C:\WINNT;C:\WINNT\System32\Wbem;C:\PROGRA~1\IBM\CLIENT~1;
C:\PROGRA~1\IBM\CLIENT~1\Shared;C:\PROGRA~1\IBM\CLIENT~1\Emulator;C:\Programmi\F
ile comuni\Autodesk Shared\;C:\Programmi\j2sdk1.4.0_03\bin
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH
prthello.java and prthello.class are in the same folder (C:\java) where i executed javac with success and java with the error above mentioned.
Any other suggestions ? Should I reinstall the JSDK ?
Thanking in advance,
Andrea Giussani

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          if (n == null)
          return;
          dataParent=(treeNodeData)n.getData();
          System.out.print(dataParent.vertex+" ");
          preOtrav(n.getLeft());
          preOtrav(n.getRight());
//problems are here!!!!!
class treeNodeData {
     int vertex;
     // data element2 -> a set of vertex fan;
It doesn't compile but with the message saying that can not resolve the symbol in preOTrav(n.getLeft()); and preOTrav(n.getRight());
Please help!

          preOtrav(n.getLeft());
          preOtrav(n.getRight());Don't write preOtrav when you mean preOTrav. Java is case-sensitive.
Jesper

Totally New in Java - Please help!!

Hi Dear all,
l am totally new in Java, and l facing one problem,and really hope can get some help from yours,please!
l need to write this program:
The program should do the following:
1. Input two fields: action (action: add / delete), and account number (any
digit or character)
2. if the action is "add" then the program adds one text line to a text
file.
"New account is <account number>"
3. create the text file if it is not already exist (in c:\)
4. When program runs again with new input values, a new line will be
appended to the same file.
5. if the action is "delete" then the program finds the record and removes
the text line from the file.
My problem is :
l just know that l need to create the user interface first,but l don't know how to go on??
Would you please show me some step how to solve these problem?
Many many thanks!!
BaoBao

I don't know about Swing. I never use it.
The stuff to create and manipulate files is in the java.io package.
You'll probably want to use java.io.FileReader and java.io.FileWriter.
Note that FileWriter has a constructor that lets you append and not overwrite.
I'll start you off with a test.
public class AccountListAddTest() {
public static void main(String[] argv) {
AccountList accts = new AccountList();
accts.add("abcdefg12345"); // arg is a hypothetical account number
}Write an AccountList class that'll work if you compile and run this test. After you run this test for the first time, the file should contain the string
New account is abcdefg12345.
This test assumes that the filename is hardcoded into the AccountList class. To keep it simple, make the add method create a new appending FileWriter each time, write, then close the writer.

New to Java, Please help

Hi, I was trying to play a game and came up with this java error (below), I uninstalled and reinstalled still no fix. I think i need a new class?, If anyone can explain the potential problem to me and help me fix it, that would be much appreciated. I'm a complete NEWB when it comes to java, I'm not even sure how to edit that code. so please remember to explain in the newbiest of newby answers. I am proficient with features of a computer just not java.
Java Plug-in 1.6.0_24
Using JRE version 1.6.0_24-b07 Java HotSpot(TM) Client VM
User home directory = C:\Users\Ethan
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
load: class loader.class not found.
java.lang.ClassNotFoundException: loader.class
at sun.plugin2.applet.Applet2ClassLoader.fi… Source)
at sun.plugin2.applet.Plugin2ClassLoader.lo… Source)
at sun.plugin2.applet.Plugin2ClassLoader.lo… Source)
at sun.plugin2.applet.Plugin2ClassLoader.lo… Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.lo… Source)
at sun.plugin2.applet.Plugin2Manager.create… Source)
at sun.plugin2.applet.Plugin2Manager$Applet… Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassNotFoundException: loader.class

845681 wrote:
Hi, I was trying to play a game and came up with this java error (below), I uninstalled and reinstalled still no fix. I think i need a new class?, If anyone can explain the potential problem to me and help me fix it, that would be much appreciated. I'm a complete NEWB when it comes to java, I'm not even sure how to edit that code. so please remember to explain in the newbiest of newby answers. I am proficient with features of a computer just not java.If you want to learn how to program java, which is not the same as playing that particular game then you can start with the following link.
http://download.oracle.com/javase/tutorial/getStarted/index.html

Trying to simplify multiple steps into one - please help

I have a set up of steps to perform on 3 tables in order to populate two tables, please suggest best way (performance wise) to do this
CREATE TABLE AE
EID    VARCHAR2(100 BYTE),
UKEY   VARCHAR2(1000 BYTE),
TNAME VARCHAR2(10 BYTE)
CREATE TABLE TAB1V
PID    VARCHAR2(100 BYTE),
PUKEY VARCHAR2(100 BYTE)
(join ae and tab1v with this condition: ae.ukey = tab1v.pukey);
CREATE TABLE PES
EID    VARCHAR2(100 BYTE),
UKEY   VARCHAR2(100 BYTE),
TNAME VARCHAR2(1000 BYTE)
(join condition with other tables, use ukey)
insert into ae (eid,ukey,tname) values ('eid1','ukey123','tname123');
insert into ae (eid,ukey,tname) values ('eid2','ukey123','tname123');
insert into ae (eid,ukey,tname) values ('eid3','ukey222','tname222');
insert into ae (eid,ukey,tname) values ('eid4','ukey222','tname222');
insert into ae (eid,ukey,tname) values ('eid5','ukey456','tname456');
insert into ae (eid,ukey,tname) values ('eid6','ukey789','tname789');
insert into ae (eid,ukey,tname) values ('eid7','ukey789','tname7891');
insert into pes(eid,ukey,tname) values('eid2','ukey123','tname123');
insert into pes(eid,ukey,tname) values('eid6','ukey789','tname789');
insert into pes(eid,ukey,tname) values('eid5','ukey456','tname456');
insert into pes(eid,ukey,tname) values('eid2','ukey123','tname123');
insert into tab1v(pid,pukey) values ('pid1','ukey123');
insert into tab1v(pid,pukey) values ('pid2','ukey222');
insert into tab1v(pid,pukey) values ('pid3','ukey111');
insert into tab1v(pid,pukey) values ('pid4','ukey456');
insert into tab1v(pid,pukey) values ('pid5','ukey789');my goal:
i have to populate two tables
1. result_table
CREATE TABLE RESULT_TABLE
PID VARCHAR2(100 BYTE),
UKEY VARCHAR2(100 BYTE),
EID VARCHAR2(100 BYTE),
TNAME VARCHAR2(100 BYTE),
SRC VARCHAR2(4 BYTE)
2. no_match table
CREATE TABLE NO_MATCH
PID VARCHAR2(100 BYTE),
UKEY VARCHAR2(100 BYTE),
my flow of logic:
1. check all the rows that are common to both tab1v and ae table (by joining with ukey),
if there are ukeys that are present in tab1v table, but absent in ae table, populate
them in no_match table, I got this with below query
select pid,pukey from tab1v
where not exists
(select ukey from ae
where ae.ukey = tab1v.pukey);
result of no_match table should be:
pid3 ukey111
for all those rows that match, probably populate in a staging table
CREATE TABLE STG_TABLE1
PID VARCHAR2(20 BYTE),
UKEY VARCHAR2(100 BYTE),
TNAME VARCHAR2(100 BYTE),
EID VARCHAR2(100 BYTE)
insert into stg_table1(pid,ukey,eid,tname)
select a.pid,b.ukey,b.eid,b.tname
from tab1v a, ae b
where A.PUKEY = b.ukey
2.After doing point 1, So if I find common rows in both tab1v and ae table (present in stg_tab1), pick up those records and check if they are present in pes table ?
join stg_table1 and pes table with ukey again
3. populate records found / and not found in point 2, do the following check and populate result_table
for records found in both stg_table1 (in other words, present in both ae and tab1v) and pes, do the following check
if each ukey has multiple same tnames attached to it (ukey123 has tname123, twice ), src should be A
if there is unique tname per ukey (ukey456 has only tname456), src should be A
if each ukey has multiple different tnames (ukey 789 has tname789 and tname7891), they should be populated and src column should be B
result_table should be like below :
PID     UKEY     EID     TNAME SRC
pid1     ukey123     eid1     tname123 A
pid1     ukey123     eid2     tname123 A
pid4     ukey456     eid5     tname456 A
pid5     ukey789     eid6     tname789       B
pid5     ukey789     eid7     tname7891      B
pid2     ukey222     null     tname222 A
pid2     ukey222     null     tname222 A
for records found in stg_table1 but absent in pes, populate the above table and same following check, but assign null to eid : (last 2 rows in above data)
following can be used to find difference
select pid,ukey,tname from stg_table1
where not exists
(select ukey from pes
where pes.ukey = stg_table1.ukey);
if each ukey has multiple same tnames attached to it (ukey222 has tname222, twice ), src should be A
if there is unique tname per ukey src should be A
if each ukey has multiple different tnames they should be populated and src should be B (none in my example data)
I am getting the results in individual sql statements, but how do I populate result_table and no_match with above data, given the above source data with minimal sql statements and considering performace as a key factor ?

Why so many unanswered questions? 66 (47 unresolved) . Are they really unanswered? Please review your 47 unresolved questions and give credit to the people with either HELPFUL or ANSWERED as appropriate. They will appreciate it.
Please provide you 4 digit Oracle version number.
In 11g you could use the INSERT ALL multi-table insert to do this: http://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_9014.htm
See the above doc at 'The next examples insert into multiple tables' where you will find this excerpt:
>
INSERT ALL
WHEN order_total < 1000000 THEN
INTO small_orders
WHEN order_total > 1000000 AND order_total < 2000000 THEN
INTO medium_orders
WHEN order_total > 2000000 THEN
INTO large_orders
SELECT order_id, order_total, sales_rep_id, customer_id
FROM orders;
>
This will let you insert into both tables with one query. Your query can use an OUTER JOIN between your tables so that the key value will be NULL when a record is not found. Then your WHEN condition will check the key value and if NULL will insert into one table and if NOT NULL will insert into the other.
Should not be a need for a staging table. Try to modify the example in the doc for your tables.

Main method question in java, please help

Guys I have looked all over the internet, and cannot understand any of these questions: I would really appreciate any help on them. The first, and most important thing I would like to know is, what is static: what is a static int, or a static main method? Why is this necessary, and what does it do? Could you please provide an example? Also, why is String[] args necessary within the parameters of the main method? Is this so that it can execute it? Last thing is: objects. Where can I learn about them? I know they are made with the new operator, but don't understand their use? Could you explain why they are useful? Can you give them values? and how do they relate to the dot operator? After these are answered, I will be so happy because I will feel like I actually know a little bit. Right now, I'm just confused... Thank you so, so much in advance!

The first, and most important thing I would like to know is, what is static'static' means that the item concerned is associated with the class itself rather than an instance: so, it is accessible to all instances.
Could you please provide an example?
public static void main(String[] args)is an example, but you knew that. I don't really understand the question.
Also, why is String[] args necessary within the parameters of the main method?'args' receives the arguments you type on the command line after the class name or jar name, depending on how you invoke the application.
This is all covered in the documentation, which you should read before asking further questions.
Last thing is: objects. Where can I learn about them?If you don't know about objects you're not going to learn about them by asking questions on a forum. It's far too large a topic. Get yourself a book.

Fundamental questions in Java, please help to answer.

I am a beginner of a Java Programming. Although I had few programming experiences on Java. But there are few conceptal questions. Hope every experts can help to explain more to me.
1. How <b>Encapsulation</b> works in Java? Why is it needed? What benefits can be given from encapsulation? Can give some examples for me to know more?
2. How <b>Overloading</b> works in Java? Why is it needed? What benefits can be given from it in the extensibility of programs? Can give some examples for me to know more?
3. How <b>inheritance</b> works in Java? What benefits can be given from inheritance? Can give further explanation, such as class hierarchy for me to know more?
4. What is <i>object class</i> and <i>object distances</i> ? What is their differences?
5. What is <b>Reusability</b>? What benefits can it gives? Why it is needed? Can give me further examples?
Thanks for help very much

Maybe I'm not getting this, but you want one of us to give you a nice short answer convenient enough for you to copy down, right? Well, there aren't many people here that are willing to do that. There are many people who won't even bother answering homework questions. I don't mind, but you need to show us some work you've done, like the previous poster said. The effort has to come from you, not us. If you are learning Java, you must put some effort into it.
How can you get an answer out of us?
Example: I understand that inheritance is ..............., but I'm not sure about this part.............. Can anyone provide some clarification please?
Anyway, this question has been crossposted on at least 5 forums already, which I'm sure is one of the reasons people aren't bothering with this question. Please DO NOT CROSSPOST, it's considered poor forum etiquette.
Please don't take anything that I said negatively, but you have to understand that we are taking our time to respond to your queries, and asking us to provide short answers without doing any work on your part, and crossposting is not going to get you answers out of us.
Cheers

My first step in Java, please help me.

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