How to java class

This is my first time learning Java, Please show me how to write the Java Class which is connect to Main Class.
Thanks a lot

Go to http://java.sun.com/docs/books/tutorial/index.html and read the "Your First Cup Of Java" article. It will walk you through all the steps.
If you're working in Linux then go here http://www.linuxnewbie.org/nhf/intel/programming/javaintro1.html and this article will explian the same thing for a Linux environment.

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How do java classes handle searches?

how do java classes store information? and how do I get it out again?
I am a relational programmer who has decided 2 take a detour in object oriented lands.
In a relational table you store info and u get the information out through a (my)SQL query
now how does a class Project with instance project 1,2,3,.........
get the information from a project with a certain name?
eg:
projectid: 1
responsible: 1234 (<--userid)
projectname: testproject
projectid: 2
responsible: 1256
projectname: leukproject
projectid: 3
responsible: 1483
projectname: testproject
projectid: 4
responsible: 3245
projectname: darnedproject
and so on....
so lets say our class Project has a thousend instances. I want to search by name, how do i write the onces to the screen who have name "testproject"?
So how do i do this without sqlquerys, totally oop?
any help would be very much appreciated! :?

Hi NiQuil,
Let me tell you a few basic things. First, RDBMS and OOP are quite different things.
In RDBMS, you ask ur database, "hey, I want this piece of info. Get me that". But you
don't tell it how to go and search for it, right. Well, things are not as simple as that in
OOP. Here you have to specify how to get your data also. But Java will surely help you
to make it easier.
First of all, you should not map between tables (of RDBMS) and classes (of OOP),
although certainly you can do this in some crude ways. What you have to do is, put all
your projects in a single instance, and then using a method, query that instance. There
are numerous ways for querying. Several classes like Hashtable, Vector, Collection
etc etc helps you to store, search and retrieve data. But I dont think it is necessary or
helpful to describe these in detail here.
However, I would like to tell you one important point. OOP is not just about data storage
and retrieval. OOP is a way of thinking. It allows you to combine your data and operations
on it. An object is just a combination of data and operations on that data. Other objects
access this data only through an interface defined by these operations. Once you
understand this concept, life will be easier. But it takes some time, especially because
you come from RDBMS, a world which talks just about data.

How do Java Class Objects get invalid?

How do Java Classes get invalid in the database?

What version of Oracle?
Oracle provided or user created?
Generally speaking if you modify the database objects a class depends on you can invalidate the object which in turn can invalidate dependend code/objects.
More specifics are needed if you need a better response.
HTH -- Mark D Powell --

How run java class on Mac Os X

i develope java appliction and run it on windows platform and now i need run it on Mac Os X but i am new user for Mac Os X and i dont know how i can open Unix shell to compile and run my classes and i dont need to use any tool to make this task.
thanks
rabab

The Terminal Application is in Utilities in Applications. You can use this to open your Unix shell. From there, you should be able to compile and run your java applications.

Documentation or Blog on using java classes in idm

Hi all,
I am new to this environment. And i would like to know how to use the java methods in rules, and how write java classes for customised purpose.
i.e writing the ones using the IDM provided package
such as getting users from session cache, and rest all ..........
Is there any documentaion for it. Or any one's blog?
Please help me out.
Thankyou

When you download IDM, the install package has a directory "RFE", you can find this information there.

How can i display the result of java class in InputText ?

Hi all,
How can i get the result of java class to InputText Or OutputText ???
also can every one in the forum give me road map for dealing with java in oracle adf because i'm beginner in oracle adf
i saw some samples in oracle adf corner but it's difficult for me.

User,
Always mention your JDev version, technologies used and clear usecase description (read through this announcement : https://forums.oracle.com/forums/ann.jspa?annID=56)
How can i get the result of java class to InputText Or OutputText ???Can you elaborate on your requirement? Do you mean the return value of a method in a class as output text? Or an attribute in your class (bean?) as text field?
-Arun

How to call a PL/SQL procedure from a Java class?

Hi,
I am new to the E-BusinessSuite and I want to develop a Portal with Java Portlets which display and write data from some E-Business databases (e.g. Customer Relationship Management or Human Resource). These data have been defined in the TCA (Trading Community Architecture) data model. I can access this data with PL/SQL API's. The next problem is how to get the data in the Java class. So, how do you call a PL/SQL procedure from a Java program?
Can anyone let me know how to solve that problem?
Thanks in advance,
Chang Si Chou

Have a look at this example:
final ApplicationModule am = panelBinding.getApplicationModule();
try
     final CallableStatement stmt = ((DBTransaction)am.getTransaction()).
                                                                                     createCallableStatement("{? = call some_pck.some_function(?, ?)}", 10);
     stmt.registerOutParameter(1, OracleTypes.VARCHAR);
     stmt.setInt(2, ((oracle.jbo.domain.Number)key.getAttribute(0)).intValue());
     stmt.setString(3, "Test");
     stmt.execute();
     stmt.close();
     return stmt.getString(1);
catch (Exception ex)
     panelBinding.reportException(ex);
     return null;
}Hope This Helps

How do you invoke custom java classes???

Could someone post a detailed method of invoking custom java classes that works including what files go where, settings and the way it is invoked etc.
I have tried various ways from this forum and in the documentation without success. I am using IDM 8. I found these instructions regarding how you would do it if you were writing custom resource adaptors in the deployment tools guide:
To install a resource adapter youve customized:
1. Load the NewResourceAdapter.class file in the Identity Manager installation
directory under
idm/WEB-INF/classes/com/waveset/adapter/sample
(You might have to create this directory.)
2. Copy the .gif file to idm/applet/images.
This .gif file is the image that displays next to the resource name on the List
Resources page, and it should contain an image for your resource that is
18x18 pixels and 72 DPI in size.
3. Add the class to the resource.adapter property in
config/waveset.properties.
4. Stop and restart the application server. (For information about working with
application servers, see Identity Manager Installation.)
I tried the instructions here but placed my custom class in a folder entitled custom instead of /adapter/sample. Not sure about instruction 3 or whether it is relevent. Anyway nothings working.
Edited by: masj78 on Nov 25, 2008 3:50 AM
Edited by: masj78 on Nov 25, 2008 4:03 AM

Hi,
The way to add custom class is the same as you followed , put them in the WEB-INF/classes.
To use the custom adapter ,
Go To Resources - > Configure Types -> Add Custom Resource .
Type in the fully qualified class name of the custom adapter you added.and Save.
Now the new adapter you added should showup in the list of available adapters when you try to
configure a new adapter.
(Make sure that the prototype XML of your custom adapter is correct so that it displays the correct name / type for the adapter in the adapter list.
Thanks,
Balu

How to return Values from Oracle Object Type to Java Class Object

Hello,
i have created an Oracle Object Types in the Database. Then i created Java classes with "jpub" of these types. Here is an example of the type.
CREATE OR REPLACE TYPE person_type AS OBJECT
ID NUMBER,
vorname VARCHAR2(30),
nachname VARCHAR2(30),
geburtstag DATE,
CONSTRUCTOR FUNCTION person_type RETURN SELF AS RESULT,
CONSTRUCTOR FUNCTION person_type(p_id NUMBER) RETURN SELF AS RESULT,
CONSTRUCTOR FUNCTION person_type(p_vorname VARCHAR2,
p_nachname VARCHAR2,
p_geburtstag DATE) RETURN SELF AS RESULT,
MEMBER FUNCTION object_exists(p_id NUMBER) RETURN BOOLEAN,
MEMBER PROCEDURE load_object(p_id NUMBER),
MEMBER PROCEDURE save_object,
MEMBER PROCEDURE insert_object,
MEMBER PROCEDURE update_object,
MEMBER PROCEDURE delete_object
MEMBER PROCEDURE load_object(p_id NUMBER) IS
BEGIN
SELECT p.id, p.vorname, p.nachname, p.geburtstag
INTO SELF.ID, SELF.vorname, self.nachname, SELF.geburtstag
FROM person p
WHERE p.id = p_id;
END;
My problem is, that if i use the member function "load_object" from my java app it doesnt return the selected values to the java class and i dont know why. I use the java class like this:
PersonObjectType p = new PersonObjectType();
p.load_object(4);
There is a reocrd in the database with id = 4 and the function will execute successful. But if i try to use "p.getVorname()" i always get "NULL". Can someone tell me how to do that?
Thanks a lot.
Edited by: NTbc on 13.07.2010 15:36
Edited by: NTbc on 13.07.2010 15:36

CallableStatement =
"DECLARE
a person_type;
BEGIN
a.load_object(4);
? := a;
END;"
And register as an out parameter.
Edited by: michael76 on 14.07.2010 05:01

How to pass a HTTP request from a simple java class

Is it possible to pass an HTTP request from a simple java class.if yes how?

Is it possible to pass an HTTP request from a simple
java class.if yes how?If you're talking about creating a HttpRequest object and passing it to a servlet, that would be a red flag to me that your design is flawed. You shouldn't have to do that - the application server (Tomcat, Weblogic, etc) should be the only thing that has to worry about creating that kind of object and passing it to you.

How to read the java class file to convert it in java.

hello all,
i m developing the java application which generated the java code from the java 'class file' .
Can anybody please help me, Is any java support for reading the class file? or how to know the class file format?
I know the application javad, jad, javap which is doing the same thing.
thanks for reply,
- Jayd

do you mean decompiling? there are tons of java decompilers available out there, what exactly are you trying to do here?

How can i use JWSDP1.6 from Ant tool to convert .wsdl file into Java class

Hi All,
i m very new in the development field.plese help me...
i have a .wsdl file and i have to make some modification in the file and return this file with build file used in Ant tool.
means my requirement is to conver the .wsdl file into java class,modify it and convert back to wsdl file.how can i do it using JWSDP1.6 and Ant tool.
thanks in advance...
Vikram Singh

lemilanais wrote:
hello!
I have developpe an animation with flash. before give it to othe person in order to use it, i would like to secure it by integrated a security module inside the software.Secure it from what? Being played? Copied? Deleted? Modified?
Because, i am a java developper, i have choose Netbeans 6.1 to secure it.That has to be the most random thing I've read in some time.
do you know how can i do to integrate my animation .swf inside my java class?Java can't play SWF files and Flash can't handle Java classes, so what you're suggesting here doesn't make a lot of sense.

How to convert a .jsp to a .java/.class file for use in peoplesoft

Hi java/jsp experts,
I want to convert a .jsp to a .java/.class file. is there a tool available, please let me know if you have any pointers....
or can i do it manually:
these are a few lines that the .jsp contains, and i would like to translate this to be in .java/.class format:
<%@ page import="sun.misc.BASE64Encoder, javax.crypto., javax.crypto.spec."%>
<%@ page import="java.util.StringTokenizer" %>
<%@ page import="java.util.Map" %>
<%!
sb.append("<input type=\"hidden\" name=\"orderPage_serialNumber\" value=\"");
sb.append(serialNumber);
sb.append("\">\n");
return sb.toString();
%>
how can i translate the above import statements and html elements from jsp to java, please let me know.
Once i have the .java file created from the .jsp, I will compile .java to create the .class file and invoke the .class in peoplecode by using java apis available in peopletools.
Thanks in advance.

Is there a way convert a binary .exe file( compiled by
another compiler) into Java .class/.jar file ? Anyone
know of a free program that can do this?It's not possible. There are many decompilers and disassemblers for Java but nothing will take you from ANY binary to Java source. It would be the end of computing as we know it and the beginning of a new era -:)

How to use java classes of DC1 in DC2

When I was trying to use a java-class from another DC, I stumbled into an error I didn't expect:
java.lang.NoClassDefFoundError: com/company/application/utils
This is what I did to get this far:
1. Created an empty Web Dynpro DC (DC1), to be used as a utilities library.
2. Added a Java class to the webdynpro project.
3. Added the class to a public part of type compilation.
4. Created a second Web Dynpro DC (DC2), which is supposed to consume the class from DC1.
5. Added a DC-usage relation, so that DC1 is in DC2's used DCs. In this usage-relation built-time and run-time were checked
5. Used DC1's class in DC2's component controller
6. Built both DCs and deployed them
7. Ran the application in DC2.
When I run the application, the application dumps a stack trace at the moment that and object is created based on the class in DC1.
Any idea how to get this working?

Vincenzo, here is the real error message:
java.lang.IllegalAccessError: tried to access method nl.phoqus.pataut.Guid.getGuidString()Ljava/lang/String; from class nl.phoqus.pataut.PatientAuthorization
I have inserted a very simple GUID generator that I used in a previous project. Please find the class file below:
package nl.phoqus.pataut;
import java.util.Random;
public class Guid {
     private static Guid guidFactory = new Guid();
     static Random random = new Random();
      * Allow global replacement of the GUID generator. Applications
      * wishing to install their own GUID generators should sub-class
      * Guid, override the getGuid() method, and use this method to
      * install their generator.
     public static void
     setGuidImpl(Guid factory) {
     guidFactory = factory;
      * Return a GUID as a string.
     public static String getString() {
     return guidFactory.getGuidString();
      * Return a GUID as a string. This is completely arbitrary, and
      * returns the hexification of a random value followed by a
      * timestamp.
     protected String getGuidString() {
        long rand = (random.nextLong() & 0x7FFFFFFFFFFFFFFFL) | 0x4000000000000000L;
        return Long.toString(rand, 32) + Long.toString(System.currentTimeMillis()&0xFFFFFFFFFFFFFL, 32);
I'm calling the class using the following statements from the component controller of DC2:
Guid x = new Guid();
String y = x.getGuidString();
The component controller resides in package package nl.phoqus.pataut.
Would that be the problem?

How to create java classes when multiple xsd files with same root element

Hi,
I got below error
12/08/09 16:26:38 BST: [ERROR] Error while parsing schema(s).Location []. 'resultClass' is already defined
12/08/09 16:26:38 BST: [ERROR] Error while parsing schema(s).Location []. (related to above error) the first definition appears here
12/08/09 16:26:38 BST: Build errors for viafrance; org.apache.maven.lifecycle.LifecycleExecutionException: Internal error in the plugin manager executing goal 'org.jvnet.jaxb2.maven2:maven-jaxb2-plugin:0.7.1:generate': Mojo execution failed.
I tried genarate java classes from multiple xsd files, but getting above error, here in .xsd file i have the <xe: element="resultClass"> in all .xsd files.
So I removed all .xsd files accept one, now genarated java classes correctly. but i want to genarte the java classes with diffrent names with out changing .xsd
Can you please tell me any one how to resolve this one......
regards
prasad.nadendla

Gregory:
If you want to upload several Java classes in one script the solution is .sql file, for example:
set define ?
create or replace and compile java source named "my.Sleep" as
package my;
import java.lang.Thread;
public class Sleep {
public static void main(String []args) throws java.lang.InterruptedException {
if (args != null && args.length>0) {
int s = Integer.parseInt(args[0]);
Thread.sleep(s*1000);
} else
Thread.sleep(1000);
create or replace and compile java source named "my.App" as
package my;
public class App {
public static void main(String []args) throws java.lang.InterruptedException {
System.out.println(args[0]);
exit
Then the .sql file can be parsed using the SQLPlus, JDeveloper or SQLDeveloper tools.
HTH, Marcelo.

How to java class

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