Types in Java

Hi all, is there any online article/ paper explaining the type system in Java?
How to check the type compatibility in Java?
Thanks.

Hi, can to check type compatibility in Java.
For example. A.methodA returns a type Ta, it is
passed forward to B.methodB with the parameter type
Tb. What should be the relation between Ta and Tb to
ensure the type compatibility?Same document:
http://java.sun.com/docs/books/jls/third_edition/html/conversions.html#5.3

Similar Messages

Cannot convert ÿØÿà of type class java.lang.String to class BFileDomain.

Hi All,
I am using Jdeveloper 11.1.2.3.0.
I have a scenario of making an ADF page where I have a IMAGE field to show on the page. So,I have a table called "PRODUCT" with fields called photo with BFILE type. Now when I the data i have inserted using the DML command and i can see the path at the backend.
However,when i am runnig my ADF page in the Filed called "PHOTO" I can only see a junk character stating 'yoyo'.
When I click on it, it says ERROR "Cannot convert ÿØÿà of type class java.lang.String to class oracle.jbo.domain.BFileDomain".
Your help will be appreciated ASAP.
Regards,
Shahnawaz

Hi,
did you show the id-value in the user interface as a input-component, and did the input-component include a converter?
If yes, show the id as output-text and remove any existing converter-components.
Best Regards

Cannot convert type class java.lang.String to class oracle.jbo.domain.Clob

Cannot convert type class java.lang.String to class oracle.jbo.domain.ClobDomain.
Using ADF Business Components I have a JSFF page fragment with an ADF form based on a table with has a column of type CLOB. The data is retrieved from the database and displayed correctly but when any field is changed and submitted the above error occurs. I have just used the drag and drop technique to create the ADF form with a submit button, am I missing a step?
I am using the production release of Jdeveloper11G

Reproduced and filed bug# 7487124
The workaround is to add a custom converter class to your ViewController project like this
package oow2008.view;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import oracle.jbo.domain.ClobDomain;
import oracle.jbo.domain.DataCreationException;
public class ClobConverter implements Converter {
     public Object getAsObject(FacesContext facesContext,
                               UIComponent uIComponent,
                               String string) {
       try {
         return string != null ? new ClobDomain(string) : null;
       } catch (DataCreationException dce) {
         dce.setAppendCodes(false);
         FacesMessage fm =
           new FacesMessage(FacesMessage.SEVERITY_ERROR,
                            "Invalid Clob Value",
                            dce.getMessage());
         throw new ConverterException(fm);
     public String getAsString(FacesContext facesContext,
                               UIComponent uIComponent,
                               Object object) {
       return object != null ?
              object.toString() :
              null;
}then to register the converter in faces-config.xml like this
<faces-config version="1.2" xmlns="http://java.sun.com/xml/ns/javaee">
<application>
    <default-render-kit-id>oracle.adf.rich</default-render-kit-id>
</application>
<converter>
    <converter-id>clobConverter</converter-id>
    <converter-class>oow2008.view.ClobConverter</converter-class>
</converter>
</faces-config>then reference this converter in the field for the ClobDomain value like this
          <af:inputText value="#{bindings.Description.inputValue}"
                        label="#{bindings.Description.hints.label}"
                        required="#{bindings.Description.hints.mandatory}"
                        columns="40"
                        maximumLength="#{bindings.Description.hints.precision}"
                        shortDesc="#{bindings.Description.hints.tooltip}"
                        wrap="soft" rows="10">
            <f:validator binding="#{bindings.Description.validator}"/>
            <f:converter converterId="clobConverter"/>
          </af:inputText>

How to get the values from struct data type using java code..?

Hi ,
I am newer to java.
we are using oracle database.
How to get the data from struct data type using java code.
Thanks in Advance.
Regards,
kumar

Hi Rajeev,
To retrieve a FilterContainer you will need to traverse the report structure:
ReportStructure boReportStructure = boDocumentInstance.getStructure();
ReportContainer boReportContainer = (ReportContainer) boReportStructure.getReportElement(0);
FilterContainer boFilterContainer = null;
if (boReportContainer.hasFilter()) {
boFilterContainer = boReportContainer.getFilter();
} else {
boFilterContainer = boReportContainer.createFilter(LogicalOperator.AND);
Calling boDocumentInstance.getStructure() will retrieve the entire structure for the document.
Calling boReportStructure.getReportElement(0) will retrieve the structure for the first report of the document.
Hope this helps.
Regards,
Dan

Selecting #of bits for data types in Java

hi,
i would like to know if we can constrain compiler on allocating memory to basic data types, such as int, float, short etc. i would like to read an exactly four byte integer into an int, 2 byte short into a short etc. i need to read these parameters exactly of their specified number of bytes - not more or less - as if i read anything more/less, i will be reading a part of other parameter.
i know that C allows us to do this by letting us to specify number of bits we like to allocate for each data type (for eg. unsigned int:16; means i need an unsigned int of exactly 16bits (2 bytes long) -no more and no less).
Is there anything similar i can do in Java?
any suggestion is greately appreciated.
Thanks,

All primitive types in Java are well-defined. In contrast to C/C++, an int in Java is allways 32 bits, using one's complement, a char is allways 16 bits etc.
Java does not give you direct acces to physical memory - that would compromise the basic design of Java.
You can read individual bytes from files, and you can do all the integer arithmetic in Java as you can in C/C++. To convert eg. fout bytes to one int, you could do the following:
byte b1= (some byte value),
     b2,
     b3,
     b4;
int i= (((b1 << 8) | b2 << 8) | b3 << 8) | b4;
b1 being the most significant byte, b4 being the least significant.
Did this answer you questions?

Incompatible types - found java.lang.String but expected int

This is an extremely small simple program but i keep getting an "incompatible types - found java.lang.String but expected int" error and dont understand why. Im still pretty new to Java so it might just be something stupid im over looking...
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Lab
public static void main(String []args)
int input = JOptionPane.showInputDialog("Input Decimal ");
String bin = Integer.toBinaryString(input);
String hex = Integer.toHexString(input);
System.out.println("Decimal= " + input + '\n' + "Binary= " + bin + '\n' + "Hexadecimal " + hex);
}

You should always post the full, exact error message.
Your error message probably says that the error occurred on something like line #10, the JOptionPane line. The error is telling you that the compiler found a String value, but an int value was expected.
If you go to the API docs for JOptionPane, it will tell you what value type is returned for showInputDialog(). The value type is String. But you are trying to assign that value to an int. You can't do that.
You will need to assign the showInputDialog() value to a String variable. Then use Integer.parseInt(the_string) to convert to an int value.

UCM: File is missing. Exception type is 'java.lang.Throwable'.

We have been having an intermittent issue with SES crawling UCM's data. There is a loose correlation between the issue occurring and the following exception appearing in UCM's Content Server Log:
File is missing. Exception type is 'java.lang.Throwable'. [ Details ]
An error has occurred. The stack trace below shows more information.
!syFileMissing,42000034474,1,61242!syExceptionType,java.lang.Throwable
java.lang.Throwable
     at intradoc.common.IdcLogWriter.doMessageAppend(IdcLogWriter.java:81)
     at intradoc.common.Log.addMessage(Log.java:268)
     at intradoc.common.Log.errorEx2(Log.java:216)
     at intradoc.common.LoggingUtils.logMessage(LoggingUtils.java:97)
     at intradoc.common.SystemUtils.reportErrorEx(SystemUtils.java:462)
     at intradoc.common.SystemUtils.errEx(SystemUtils.java:547)
     at intradoc.common.SystemUtils.err(SystemUtils.java:538)
     at intradoc.indexer.CommonIndexerBulkLoader.handleLoadError(CommonIndexerBulkLoader.java:544)
     at intradoc.indexer.CommonIndexerBulkLoader.loadRecordWebChange(CommonIndexerBulkLoader.java:205)
     at intradoc.indexer.IndexerBulkLoader.createBulkLoad(IndexerBulkLoader.java:309)
     at intradoc.indexer.IndexerBulkLoader.doWork(IndexerBulkLoader.java:164)
     at intradoc.indexer.Indexer.doIndexing(Indexer.java:431)
     at intradoc.indexer.Indexer.buildIndex(Indexer.java:340)
     at intradoc.server.IndexerMonitor.doIndexing(IndexerMonitor.java:1012)
     at intradoc.server.IndexerMonitor$4.run(IndexerMonitor.java:832)
Can anybody tell me what conditions would cause this error?

well yes:
panel.addGLEventListener(new GLR());
"GLR" implements "GLEventListener" and defines the required methods
I installed the Netbeans OpenGL Pack on NetBeans 6.5 and there is a problem with that...mh :(
Ok I also tried to create a GLPanel-Sample-Project and modify it but netbeans don't know "javax.swing.GroupLayout;" I installed the JDK as well.
mh what can i do: try to fix my actual error or try to get GroupLayout in java.swing^^

Does data type nvarchar in SQL 7.0 have matched DATA TYPE in JAVA

does data type nvarchar in SQL 7.0 have matched DATA TYPE in JAVA
I use odbc-jdbc bridge to connect to SQL 7.0
thanks in advance!

try String.
java.sql.Types.VARCHAR would be the sql type.

Showing bangla character in all types of java mobile using bitmap fonts

i am a new user of j2me.but i cannot find any helps.
i want to do english to bangla dictionary for all types of java mobile using bitmap
fonts.
initially how can i display bangla character using bitmap font in non unicode supported java mobile???
but i cant do it.
please send me source code or any helping resource.
i am waiting for your reply.

More info; installed mplayer2 which should work better with vdpau and this happened;
VO: [vdpau] 800x468 => 800x468 Planar YV12
[vdpau] Got display refresh rate 60.015 Hz.
[vdpau] If that value looks wrong give the -vo vdpau:fps=X suboption manually.
A: 6.3 V: 6.4 A-V: -0.000 ct: 0.000 0/ 0 1% 2% 0.2% 0 0
[h264 @ 0xb6b41640]left block unavailable for requested intra mode at 0 23
[h264 @ 0xb6b41640]error while decoding MB 0 23, bytestream (1111)
[h264 @ 0xb6b41640]concealing 399 DC, 399 AC, 399 MV errors
A: 6.5 V: 6.6 A-V: 0.000 ct: -0.000 0/ 0 1% 2% 0.2% 0 0
Seek failed
Seek failed
Seek failed
Seek failed
Seek failed
Seek failed
Alot of those "Seek failed"!

Sql type to Java class?

I want to write a utility class to generate a java source file (bean) from out of the metadata of a database table. the metadata returns the column type as a java.sql.Types constant (int value). now, i want to map these int values to Java classes. (e.g. Types.INT => java.lang.Integer). Is there already such a method in the API or do i have to write my own switch ... case Types.INT ... result = Integer.class ... method?

well, i wrote my own utility method to generate such beans:
     * Convert SQL type code to corresponding Java class.
     * @param sqlType One of java.sql.Types.xxx.
     * @return Class that corresponds to the given type.
    public static Class toClass(int sqlType) {
        Class result = null;
        switch (sqlType) {
        case Types.BIGINT :
        case Types.INTEGER :
        case Types.SMALLINT :
        case Types.TINYINT :
            result = Integer.class;
            break;
        case Types.BIT :
        case Types.BOOLEAN :
            result = Boolean.class;
            break;
        case Types.CHAR :
            result = Character.class;
            break;
        case Types.DATE :
        case Types.TIMESTAMP :
            result = java.util.Date.class;
            break;
        case Types.DECIMAL :
        case Types.DOUBLE :
        case Types.FLOAT :
            result = BigDecimal.class;
            break;
        case Types.NULL :
            result = null;
            break;
        case Types.LONGVARCHAR :
        case Types.VARCHAR :
        default :
            result = String.class;
            break;
        return result;
    }//toClass()
     * Create a Java bean (source file) to map a database table. The class name is the table name, the bean
     * properties are the table columns. Each column will result in a property with a corresponding set() and
     * get() method.
     * @param connection Database connection to load table from.
     * @param schema Schema to get tables for.
     * @param tableName Name of table to create the bean for.
     * @param className Name of Java class to create.
     * @param fileName Name of Java source file to create.
     * @throws SQLException, IOException
    public static void createTableBean(Connection connection, String schema, String tableName, String className, String fileName)
            throws SQLException, IOException {
        if (connection != null && tableName != null && fileName != null) {
            //read table columns:
            DatabaseMetaData dmd = connection.getMetaData();
            ResultSet resultSet = dmd.getColumns(null, "%", tableName, null);
            Properties props = new Properties();
            if (resultSet != null) {
                while (resultSet.next()) { //for each table
                    String name = resultSet.getString("COLUMN_NAME");
                    int type = resultSet.getInt("DATA_TYPE");
                    props.setProperty(name, ""+type);
                }//next table
            }//else: resultSet unavailable
            //create source file:
            File file = new File(fileName);
            StringBuffer sb = new StringBuffer();
            sb.append("/* $Header:$ */\n");
            sb.append("package TODO;\n\n");
            sb.append("/**\n");
            sb.append(" * Container class to store data of one record (row) of table '"+tableName+"'.\n");
            sb.append(" *\n");
            sb.append(" * @version $Revision:$ ($Date:$)\n");
            sb.append(" * @author $Author:$\n");
            sb.append(" */\n");
            sb.append("public class ");
            sb.append(className);
            sb.append(" {\n\n");
            Enumeration enum = props.keys();
            StringBuffer sb2 = new StringBuffer(); //methods
            StringBuffer sb3 = new StringBuffer(); //toString()
            while (enum.hasMoreElements()) {
                String columnName = (String) enum.nextElement();
                //change first character of column name to lower case:
                String fieldName = columnName.substring(0, 1).toLowerCase() + columnName.substring(1);
                String stype = props.getProperty(columnName, ""+Types.VARCHAR);
                int type = (new Integer(stype)).intValue();
                Class javaClass = toClass(type);
                String typeName = "String"; //default
                if (javaClass != null) {
                    String javaClassName = javaClass.getName();
                    int lastDot = javaClassName.lastIndexOf('.');
                    if (lastDot >= 0) {
                        typeName = javaClassName.substring(lastDot + 1);
                //field:
                sb.append("    /** ");
                sb.append(columnName);
                sb.append(" */\n");
                sb.append("    private ");
                sb.append(typeName);
                sb.append(" ");
                sb.append(fieldName);
                sb.append(" = null;\n");
                //toString() method:
                sb3.append("        sb.append(\",");
                sb3.append(fieldName);
                sb3.append("=\");\n");
                sb3.append("        sb.append(");
                sb3.append(fieldName);
                sb3.append(");\n");
                //set method:
                sb2.append("    /**\n");
                sb2.append("     * Set ");
                sb2.append(columnName);
                sb2.append(".\n     *\n     * @param value ");
                sb2.append(columnName);
                sb2.append(" to set.\n");
                sb2.append("     */\n");
                sb2.append("    public void set");
                sb2.append(columnName);
                sb2.append("(");
                sb2.append(typeName);
                sb2.append(" value) {\n        ");
                sb2.append(fieldName);
                sb2.append(" = value;\n    }\n\n");
                //get method:
                sb2.append("    /**\n");
                sb2.append("     * Get ");
                sb2.append(columnName);
                sb2.append(".\n     *\n     * @return ");
                sb2.append(columnName);
                sb2.append(".\n     */\n");
                sb2.append("    public ");
                sb2.append(typeName);
                sb2.append(" get");
                sb2.append(columnName);
                sb2.append("() {\n");
                sb2.append("        return ");
                sb2.append(fieldName);
                sb2.append(";\n    }\n\n");
            }//next column
            sb.append("\n\n");
            sb.append(sb2.toString()); //methods
            //overwrite toString() method:
            sb.append("    /**\n");
            sb.append("     * Overwrite super.\n");
            sb.append("     *\n     * @return String representation of the object.\n");
            sb.append("     */\n");
            sb.append("    public String toString() {\n");
            sb.append("        StringBuffer sb = new StringBuffer(super.toString());\n\n");
            sb.append(sb3.toString());
            sb.append("\n        return sb.toString();\n");
            sb.append("    }\n\n");
            sb.append("}//"+className);
            //write to file:
            String text = sb.toString();
            BufferedWriter bw = null;
            try {
                bw = new BufferedWriter(new FileWriter(file));
                bw.write(text, 0, text.length());
            } finally {
                if (bw != null) {
                    try { bw.close(); } catch (IOException ioe) { /* ignore */ }
        }//else: input unavailable
    }//createTableBean()

How to read XI Data type in Java code and populate as array list, using UDF

Hi,
How to read XI Data type in Java code and populate as array list, using UDF?
Is there any API using which the XI data types can be read?
Kindly reply.
Richa

Input Structure:
<?xml version="1.0" encoding="UTF-8"?>
<ns0:CustomerCreateResp xmlns:ns0="urn:bp:xi:up:re:cust_mdm:cmdm:pr5:100">
   <CUSTOMER>
      <item>
         <CUSTOMERNO/>
         <MDMCUSTOMER/>
         <CREATE_DATE/>
         <RETURN>
            <TYPE/>
            <MESSAGE/>
         </RETURN>
         <PT_CONTPART_RETURN>
            <item>
               <MDM_CONTACT/>
               <CONTACT/>
            </item>
         </PT_CONTPART_RETURN>
         <PARTNERS>
            <item>
               <CUSTOMERNO/>
               <PARTNER_FUNCTION/>
               <PARTNER_NUMBER/>
               <DEFAULT_PARTNER/>
            </item>
         </PARTNERS>
      </item>
   </CUSTOMER>
</ns0:CustomerCreateResp>
Output structure
(Sample output structure.This actually needs to be mapped and generated using UDF)
<?xml version="1.0" encoding="UTF-8"?>
<ns1:updateCustomer xmlns:ns1="urn:xiSericeVi"><ns1:customer><ns2:ArrayList xmlns:ns2="java:sap/standard">[]</ns2:ArrayList></ns1:customer><ns1:name>2344566</ns1:name></ns1:updateCustomer>

Is there a date data type in java???

Hi guys!
Is there a date data type in java???
How to declare date data type variable?
Your reply is greatly appreciated!
-=samer=-

RTFM
there's about 8 date types, depending on what you want
see
java.util.Date
java.util.Calendar
GregorianCalendar
SimpleDateFormat
System.currentTimeMillis()

Exist DataTable Type in Java?

Hi, I'm new in Java Programming. In VB.Net I like to manipulate SQL Queries in a DataTable and later post it in a DataGridView. In VB exist a type called DataTable;
Dim dt as DataTable
I saw the JTable, but, that is like the DataGridView. I'm guessing if there is one DataTable type in Java?
Thanks in advanced for any help....
_e

Thanks! that's pretty much near of what I want. In VB the approach to create a data table and manipulate the data, like, add rows, add columns, etc... is more simple than java.
_e

Types of Java compilers

Hi Java community,
I am an 2004 passout MCA frm India
Ques 1 ) Can any one help me to find that how many types of java compilers are available today in market along witn their manufacturerslist .
Ques 2) In a class file format 1st thing that the JVM checks is "magic number" that has vaue "OxCAFEBABE" to determine that it is a valid .class file i.e, the * .class file generated after compilation by java compiler containing magic number. Now what I want to know is that whether all java compilers are required to generate this magic number & attach it in a compiled file (*.class file ) or not . (Also If any one can throw some light on specifications layed down by sun for building a new JVM & Java compiler).
With Thanks in Anticipation
Neone Nagendra

I tried finding it on google 4-5 times but couldn't find any specific answers.
If you r aware of any specific URL for answer to these questions plz specify.
Thanks in Anticipation
Neone
Nagendra

Accessing table type from JAVA

Hi Experts,
We are making a custom copy of the std FM COM_BPUS_ORG_CONTPERS_REGISTER .
It is observed that Tables are obsolete and we should not use them in custom function modules.
I can pass a table type in import parameter and export parameter.
Can we access a table type from java layer.
Also, note that this STANDARD function module has parameter IT_BUSINESSPARTNERROLE_ORG which has table type BU_ROLE_T.
Is it possible to access this?
Note:- This Function module is not getting called in standard web shops.
Please let me now how i can access this table type for hava while calling FM so as to input or retrieve valus from it.
Regards
Antony

The issue with you is more than accessing a table type.
You said:
This Function module is not getting called in standard web shops.
For function modules that are not called as a part of the standard flow, you have to develop your own simple BOM, BO, BEI, BE classes and methods to call the custom RFC - the whole nine yards. See the extension guide and see the Extension Demos 2 and 3 for reference.
See the sample JCO calls from Java to understand how to access the table types.

What type of java is more suitable for message sending application from pc

Hi,
i m a beginner at java. now i having a assignment, that is write a coding which can send a message from pc to mobile phone.
what i knew is it is require a smsc but is it can replace with kannel software? or need both of it?
my lecturer is jus require us use java to write the coding. is it i can use javaBean to do it or j2me? any suggestion?
if yes then what software should i download with? currently i hv netBean and JCreator software only. the 2 software are useful?
i saw few website is allow people send a free sms to mobile phone, why they can do like that?
is it possible send a message is without any charges?
pls help me , i really need ur help... anywhere thanks for u all...
Thanks for your time,
yuanney

{color:#000080}Maybe I shouldn't, but I'm taking pity on you here.
j2me is for applications for mobile devices. Since your application is to run on a computer, it will be developed in j2se.
NetBeans is a free IDE, not a java language component as you seem to be thinking. It can be used for developing various types of java applications, but using it will require that you learn how to use NetBeans in addition to learning java.
Use Google a LOT, you will find complete code segments that you may be able to adapt for your purpose.
If you need more help from this forum, you will need to know the best way to ask. For that, read
{color}{color:#0000ff}http://catb.org/~esr/faqs/smart-questions.html{color}{color:#000080}
db{color}

Types in Java

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