What is a primitive data type?

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See 4.1 The Kinds of Types and Values and 4.2 Primitive Types and Values in the JLS, and then post again if you have questions.

Similar Messages

  • Runtime conversion of a string value to a primitive data type in java

    can anyone of you give me an idea to convert a string value to a primitive data type during run time...i have the value and the type to which it has to be converted as String values...do you have any idea ,...pls share

    String recvalvalue = inputval;
                    String recvartype = inputtype;
                   if (recvartype.equals("int")){
                   value0 = Integer.parseInt(recvalvalue);
             else
             if (recvartype.equals("double")){
                    value1  = Double.parseDouble(recvalvalue);
             else
             if(recvartype.equals("float")){
              value2 = Float.parseFloat(recvalvalue);
             else
             if(recvartype.equals("Boolean")){
              value3 = Boolean.parseBoolean(recvalvalue);
             else
             if(recvartype.equals("char")){
               value4 = (char)recvalvalue.charAt(0);
            else
            if(recvartype.equals("String")){
              value5 = recvalvalue;
             else
             if(recvartype.equals("byte")){
               value6 = Byte.parseByte(recvalvalue);
                  //listA.add(6, value6);
                  //     listA.g = value6;
             else
              if(recvartype.equals("long")){
               value7 = Long.parseLong(recvalvalue);
             else
              if(recvartype.equals("short")){
              value8 = Short.parseShort(recvalvalue);
             } yes i can do this but the resultant value has to be assigned to a variable of a specific type which is here recvartype .....it has to be done dynamically automatically..if we know what type of data is that we can convert and assign to the type but we donot know when we run the program as the program will be supllied by someone and has to be executed

  • Creation of new primitive data types

    Is it possible to create primitive data types? Or perhaps there's another solution...
    I have a need to work with signed integers represented by more than 128 bits, and would prefer to define such variables as primitive types and be able to use them as such. I have no problem creating "toString()" and friends for convert binary to decimal.
    Thanks in advance.
    Randolf Richardson - [email protected]
    Inter-Corporate Computer & Network Services, Inc.
    Vancouver, British Columbia, Canada
    http://www.8x.ca/

    What about using "BigIntegers"?
    http://java.sun.com/j2se/1.4.2/docs/api/java/math/BigInteger.html

  • Primitive v/s Non-primitive data type

    Hi,
    I am new to java. What is the difference between primitive and non-primitive data type?

    hi Anand,
    there are hundred thousands of object in the Data Dictionary, so 15 won't harm much On the other hand, if you build up an ALV list based on this table, than it is good that you have these texts there with translations, etc.
    hope this helps
    ec

  • JAX-RPC and non-primitive data types

    Hello all!
    I am using JWSDP v1.3 and i have a problem using non-primitive data types as return types for my operations.
    Consider the helloservice example of the JWSDP1.3 tutorial. Now suppose that instead of having the simple operation sayHello() that returns a String, we execute a query on a database, get some ResultSetMetaData and we want these Metadata to be the return type of our operation. I.e. have the operation
    public ResultSetMetaData sayHello()
    instead of the
    public String sayHello()
    of the tutorial.
    When trying to build the service i get the following error which is normal, because ResultSetMetaData is not a supported JAX-RPC type.
    run-wscompile: [echo] Running wscompile: [echo] C:\jwsdp\apache-ant\../jaxrpc/bin/wscompile.bat -define -d build - nd build -classpath build config-interface.xml -model build/model. gz [exec] error: invalid type for JAX-RPC structure: java.sql.ResultSetMetaData [exec] Result: 1
    Is there any way to define an operation like this? Can i specify somehow ResultSetMetaData as a supported-type?
    I hope someone can give me some advice on it, because i have lost one evening trying to figure it out myself :)
    Regards,
    Kostas

    Courtesy links to crossposts so people don't waste their time answering a question which has already been answered
    http://forum.java.sun.com/thread.jsp?thread=482875&forum=59&message=2253704
    http://forum.java.sun.com/thread.jsp?thread=482873&forum=331&message=2253699

  • Should Java introduce new primitive data types??

    In Java SE 5.0, many character- related methods (especially in the class Character) handle code points by using int type, i.e. return (code point) type is int, or receive (code point) int as parameter. This leads several problems. First, the variable used for storing returned result should be carefully stated, otherwise confusion may arise. Second, the parameters of method should be carefully ordered, otherwise conflict of method signature may meet.
    By those reasons, I suggest that Java should introduce new primitive data types for handling characters, they are:
    1. wchar
    this type states the variable stores 32-bit UNSIGNED integer, and it could be used to store either the code point, or the UTF-16 code of a character.
    2. ascii
    this type states the variable stores 8-bit UNSIGNED integer, and it could be used to store the code point of a elemental (ascii) character.

    short char, no. Nononono.
    No.
    wchar, I think I'd pref to see Java version 2 come
    out, and that be wchar by default, but that is not
    going to happen.
    I don't see a great need for it at this time.http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4504839
    Though I do not think that Java developer would like to change too much program code for using proposed (unsigned) primitive data types, I still believe that Java developer will eventually introduce these types, because it is not efficient to pretend signed integer to unsigned integer, and the success of a programming language is determined by how it can meet the programmers' need.

  • What should be the data type for a field in ztable?

    i am desing a ztable , wht should be the datatype for a field if i want to enter values like -1.5 and -2.5 , negative values with decimals what should be the data type???

    declare as P type. TYPE P DECIMALS 1
    Type P data allows digits after the decimal point. The number of decimal places is generic, and is determined in the program. The value range of type P data depends on its size and the number of digits after the decimal point. The valid size can be any value from 1 to 16 bytes. Two decimal digits are packed into one byte, while the last byte contains one digit and the sign. Up to 14 digits are allowed after the decimal point. The initial value is zero. When working with type P data, it is a good idea to set the program attribute Fixed point arithmetic.Otherwise, type P numbers are treated as integers.
    You can use type P data for such values as distances, weights, amounts of money, and so on.
    Also check this link.
    http://help.sap.com/saphelp_nw04/helpdata/en/fc/eb2fd9358411d1829f0000e829fbfe/content.htm
    Regards,
    Maha

  • Primitive data types as a sequence of bytes

    Does anyone have any experience of converting between primitive data types and sequences (i.e. arrays) of bytes? In particular I want to transmit primitive data types over a socket connection by writing a sequence of bytes.
    Thanks in advance.

    Yes. My personal favourite class for this is java.nio.ByteBuffer though you can also do it with java.io.DataInputStream/DataOutputStream and that might work better with sockets. ByteBuffer is particularly useful with pre-specified formats since you can specify big/little endian storage.

  • Setting precision to primitive data types

    How can I set precisions to the primitive data types, viz, double and float??
    I'm writing a program in which I've declared a double variable as follows :
    double d=12.00
    System.out.println(d);
    The output is 12.0 but I want it to be 12.00
    How can it be done??

    You have to use a BigDecimal:
            BigDecimal bd = new BigDecimal(12);
            bd = bd.setScale(2, BigDecimal.ROUND_HALF_UP);
            System.out.println(bd);

  • JAVA primitive data types - Signed/ unsigned etc.

    1. Are the following data types signed or unsigned in JAVA?
    byte, short, int, long, float, double
    2. I have tried using "Integer" in place of "int" and the program runs perfectly. Why is this so when "Integer" is not a reserved word in JAVA?
    Thanks.

    And to answer your first question, byte, short, int, long, float and double are all signed.
    As a part of the core of the language, Sun developed a series of 'collections' classes; Vector, ArrayList, etc. All of these classes, in the days before generics, were able to store instances of the Object class or anything that derived from it. Therefore, to store an int, a float or a double value into one of these collections classes, it was necessary to wrap it up in an instance of one of those classes that derived from Number. These are the wrapper classes that the previous poster alluded to. Typically, the wrapper class has a similar name to the primitive data type but with a capital latter; int - Integer, double - Double, etc.

  • Transferring primitive data types via UDP other than a String

    Hi ALL,
    I am new to Socket programming in UDP.
    I need to implement a FTP client-server application.
    Now the packet that I need to transfer using UDP as a DatagramPacket consists of multiple primitive data types, (3short types and 1 byte array of size 265.)
    How do I do that?
    All the samples and examples I managed to find on the Internet illustrated the problem of transferring a String type converted to getBytes and the byteArray is transferred.
    However, in my case i need to pass this structure..(3fields) to the other side. If I convert the 4 fields to a single concatenated string there's this problem of finding out where each of the four fields begin and where do they end.
    Please suggest and help...
    thanks..
    : )

    Just create a class that represents your structure and convert-it to a byte array that can be sended over a DatagramSocket.
    Try this sample code :
    import java.io.*;
    import java.net.*;
    public class DP
        /** Creates a new instance of DP */
        public DP ()
         * @param args the command line arguments
        public static void main (String[] args)
            try
                System.out.println ("Starting server ...");
                DatagramServerThread server = new DatagramServerThread ("Datagram server");
                server.start ();
                System.out.println ("Creating your object ...");
                ByteArrayOutputStream baos = new ByteArrayOutputStream (); // Creating byte array output stream ..
                ObjectOutputStream oos = new ObjectOutputStream (baos);// Creating a object output stream that writes to byte array output stream..
                YourStructure newObject = new YourStructure (); // creating your data structure..
                newObject.setShortField1 ((short)12);// setting values ...
                newObject.setShortField2 ((short)45);
                newObject.setShortField3 ((short)4);
                newObject.setArray (new byte [256]);
                oos.writeObject (newObject); // write your structure to object output stream...
                byte data_to_be_sent[] = baos.toByteArray (); // retrieving equivalent byte array...
                // send data...
                DatagramSocket s = new DatagramSocket ();
                System.out.println ("Sending ...");
                DatagramPacket packet = new DatagramPacket (data_to_be_sent, data_to_be_sent.length);
                packet.setAddress (InetAddress.getByName ("localhost"));
                packet.setPort (8888);
                s.send (packet);
            catch (Exception e)
                e.printStackTrace ();
    class YourStructure implements Serializable
         * Holds value of property shortField1.
        private short shortField1;
         * Holds value of property shortField2.
        private short shortField2;
         * Holds value of property shortField3.
        private short shortField3;
         * Holds value of property array.
        private byte[] array;
         * Getter for property shortField1.
         * @return Value of property shortField1.
        public short getShortField1 ()
            return this.shortField1;
         * Setter for property shortField1.
         * @param shortField1 New value of property shortField1.
        public void setShortField1 (short shortField1)
            this.shortField1 = shortField1;
         * Getter for property shortField2.
         * @return Value of property shortField2.
        public short getShortField2 ()
            return this.shortField2;
         * Setter for property shortField2.
         * @param shortField2 New value of property shortField2.
        public void setShortField2 (short shortField2)
            this.shortField2 = shortField2;
         * Getter for property shortField3.
         * @return Value of property shortField3.
        public short getShortField3 ()
            return this.shortField3;
         * Setter for property shortField3.
         * @param shortField3 New value of property shortField3.
        public void setShortField3 (short shortField3)
            this.shortField3 = shortField3;
         * Getter for property array.
         * @return Value of property array.
        public byte[] getArray ()
            return this.array;
         * Setter for property array.
         * @param array New value of property array.
        public void setArray (byte[] array)
            this.array = array;
        public String toString ()
            StringBuffer buffer = new StringBuffer ();
            buffer.append ("Short field 1 is ");
            buffer.append(this.getShortField1 ());
            buffer.append ("\nShort field 2 is ");
            buffer.append (this.getShortField2 ());
            buffer.append ("\nShort field 3 is ");
            buffer.append (this.getShortField3 ());
            buffer.append ("\nYour array field is ");
            for (int index = 0; index < this.getArray ().length; index++)
                buffer.append ("Index [" + index + "] = " + this.getArray () [index] + "\n");
            return buffer.toString ();
    class DatagramServerThread extends Thread
        protected DatagramSocket socket = null;
        public DatagramServerThread (String name) throws IOException
            super (name);
            socket = new DatagramSocket (8888);
        public void run ()
            try
                byte buffer [] = new byte [socket.getReceiveBufferSize ()];
                DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
                System.out.println ("Server is ready. Waiting for packet ...");
                socket.receive(packet); // waiting for packet ...
                System.out.println ("Packet received! : ");
                byte received_data[] = packet.getData ();
                ByteArrayInputStream bais = new ByteArrayInputStream (received_data); // Creating byte array input stream ..
                ObjectInputStream ois = new ObjectInputStream (bais); // Creting Object input stream
                Object readed_object = ois.readObject ();
                YourStructure your_original_object = (YourStructure)readed_object;
                System.out.println (your_original_object.toString ());
                System.out.println ("Exiting server thread. Bye");
                socket.close ();
            catch (Exception e)
                System.err.println ("Server error");
                e.printStackTrace ();
    }

  • What is native Sql data types and does oracle support this?

    what is native Sql data types
    Does oracle support this?

    http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14220/datatype.htm#g31099

  • What is the best data type to store XML string

    Hello all,
    If we want to store a XML string in oracle database table for some other program use what is the best data type that we can use in the table to store this XML string..
    Is it VARCHAR? or can we use BLOB type
    Anybody to help please
    Message was edited by:
    user483578

    If your XML data will not be larger than 4000 characters then use VARCHAR2 else CLOB. I don't see a need to use BLOB (unless your XML data contains binary information).

  • What is the best data type for wallet application?

    Hi Friends..
    I want to know what is the best data type for wallet application..
    Assume that, i want to the Total of money saved digitally in Applet Wallet..
    And then if there's any transaction the Total of money which saved digitally in Applet Wallet would be Subtracted or Added depends on how much money that spent or saved..
    Which one is the best implementation of these scenarios :
    1. I save the User ID and Total of money in the Java Card, and then if there's any transactions, it would be added or subtracted directly and then saved again in the Java Card
    2. Or.. I save the User ID in the Java Card whereas Total of money in the Database, and then if there's any transactions, the ID would be read from the Card, and then select the Database based on that ID, and then Add or Subtract the money depends on how much money spent in the Transaction
    Please help me regarding this
    Thanks in advance

    Hi,
    Personally I would choose to store the total amount stored on the card. You could use two shorts (short[] perhaps) to store an integer (add more shorts to increase precision) and simply handle overflow your self. You could even look into using a third party library (or class) that treats a byte array as a big integer etc. There were some posts recently on floating point arithmetic that could be helpful for you since you will probably want to use decimals and JC does not natively support floats.
    Cheers,
    Shane

  • How to invoke a class at run-time for primitive data types?

    Hi,
    I am trying to invoke classes at run-time.
    I am using Class.forName("className") for that where the "className" is also obtained at run-time .
    The problem I am getting is when the "className" is "int" or "char" etc. the call to Class.forName("int") etc. fails giving ClassNotFound error. It works fine for "className" is "java.lang.String" or "java.lang.Integer" etc.
    How can I correct this?
    thanks in advance-
    kg

    Hi,
    Thanks all for the valuable inputs.
    I have created a hashtable of primitive data types in the form of "int" as key and "Integer.TYPE" as the object in that element of the hashtable.
    Now there is another problem I am facing and that is of 'Casting at run-time'.
    Problem is there when the Database type is 'NUMBER' which returns me a "java.lang.BigDecimal" when I do a ResultSet.getObject("XXX") for that whereas the method in the javabean expects an "int" type.
    This causes "java.lang.IllegalArgumentException: argument type mismatch"
    So I want to cast it at runtime. How can I do it?
    Here is the code I am trying (which generates the above exception)
    public static void setBeanField(Class pCls,Object pObj,String pMethodName ,Object pColumnValue,Class
    pColumnTypeClass){
    try{
    if(pColumnValue!=null){
    Class[] paramTypes = new Class[]{pColumnTypeClass};
    Object[] args = new Object[]{pColumnValue};
    Method meth = pCls.getMethod(pMethodName,paramTypes);
    meth.invoke(pObj,args);
    }catch(Exception e){
    System.out.println("Exception in TestInrospection.setBeanField " + e);
    thanks in advance-
    kg

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