unicode value for char

[abalfazl hossein]

import java.io.*;
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        /// instantiate data input stream
DataInputStream din = new DataInputStream (System.in);
// Ask user to enter a message
System.out.println("please enter a char");
char ch = (char) System.in.read();
int unicodeVal = Character.getNumericValue(ch);
System.out.println(unicodeVal);
}

}

I want to show the unicode value of input character but it does not work

[Mohamed Sanaulla]

Please TellTheDetails ItDoesntWorkIsUseless

[Tom Reilly]

System.in.read() reads a byte, not a char (a char is two bytes). To show this, try running the following code:

import java.io.*;
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException
    {
        // instantiate data input stream
        //DataInputStream din = new DataInputStream (System.in);
        // Ask user to enter a message
        System.out.println("please enter a char");
        byte b[] = new byte[10];
        int numRead = System.in.read(b);
        System.out.println("numRead = " + numRead);
        for (int i = 0; i < numRead; i++)
        {
            System.out.print(b[i] + " ");
        }
    }
}

[abalfazl hossein]

Thanks tom,

I want the code show this: "\u0633",But it doesn't

This is output of your code:

please enter a char
س
numRead = 2
-45 10 please enter a char

[Stephan van Hulst]

Remember, for character data we don't use InputStream, we use Reader. Wrap a Reader around System.in, using the correct encoding, and then you can read one character at a time.

[abalfazl hossein]

Thank you

Look at this code:

String unicodeMessage =
    "\u0633";

    PrintStream out = new PrintStream(System.out, true, "windows-1256");
    out.println(unicodeMessage);

The output is :

س

Now my question:

I want that code return \u0633 when I enter س I had posted.

It java itself convert \u0633 to س, Then why it couldn't convert س to \u0633

This is code that I wrote:

public class Main {

    
    public static void main(String[] args) throws IOException {
        
int a=(int)'س';

System.out.print(Integer.toHexString(a));

}

}

ouput:

633

I want it shows this "\u0633" without add "u" or "\" in the program, by programmer.

[Tom Reilly]

Will this be acceptable?

    public static void main(String...args)
    {
        int i = (int)'Z';
        String unicode = String.format("\\u%04x", i);
        System.out.println(unicode);
    }

[abalfazl hossein]

What is the simplest way in java in order to convert unicode to character?

\u0633 conver to س

Is this correct:

UTF8 is a standard for unicode encoding.

[Stephan van Hulst]

Abalfazl, I get the impression you are confused about the meaning of \u0633.

Any of the \uxxxx tokens in Java source code will be read by Java's 'precompiler', and automatically converted to their char representation. This all happens before the source code is actually compiled. This is done in the entire file, including comments, strings and other code.
It's simply a way you can enter unicode characters in your source file without being able to type their actual character representation. Outside of the precompiler, these tokens have no meaning.

There is no simplest way of converting \u0633 to س, because they already mean exactly the same thing, as far as Java in concerned.

What is it exactly you want to do?

As for your question regarding UTF-8, what have you found out for yourself?

[abalfazl hossein]

Thanks, I want to understand unicode deeply.

String unicodeMessage =
    "\u0633";

    PrintStream out = new PrintStream(System.out, true, "windows-1256");
    out.println(unicodeMessage);

Is there easier way to convert \u0633 to س

[Stephan van Hulst]

What do you mean by convert? To print the graphical glyph representing the unicode character? Then no, this should be simple enough.

[abalfazl hossein]

I have question about this line:

PrintStream out = new PrintStream([b]System.out[/b], true, "windows-1256"); 

This prototype is from:http://download.oracle.com/javase/1.4.2/docs/api/java/io/PrintStream.html

PrintStream([b]OutputStream[/b] out, boolean autoFlush, String encoding)

Is System.out instance of OutputStream?May you explain about the this redirect mechanism?

[Jesper de Jong]

abalfazl hossein wrote:Is System.out instance of OutputStream?

You can find the answer to this question in the documentation of class java.lang.System.

[Campbell Ritchie]

Jesper de Jong wrote:

abalfazl hossein wrote:Is System.out instance of OutputStream?

You can find the answer to this question in the documentation of class java.lang.System.

. . . or . . .

public class SystemOut
{
   public static void main(String[] args)
   {
       System.out.println(System.out instanceof java.io.OutputStream ? "yes" : "no" );
   }
}