Develop Reference

Is there a way to print text after the line where the user inputs?

I'm looking to print text on a line that is AFTER where the user is inputing their text.
String userInput;
System.out.println("Hello");
userInput = In.getString();
//I want a System.out.print(""); right here, but I want it to appear while
//the user is still typing their input.
Print: "Hello"
User is getting input
Print "I am printing this at the same time that the user is typing"

As mentioned in the comments, keystrokes cannot be captured in raw java console applications.
His could be do e using gui applications like using AWT/Swing GUI.
Since this could be an overkill for your problem, you should know that java suports editing of console outputs in a way.
E.g. if the current output has hello, printing \b character will erase one character from console and it will look like hell.
Perhaps you can think in these lines and build your functionality.

You can put console into raw mode. There is no built-in platform-independent way of getting there. This might be a solution you can implement,
Non blocking console input in Python and Java
got it from here. There are more solutions in there that might be helpful

showDocument() with non-standard (Chinese) characters

So, I finally discovered that JavaFX lets you use HostServices.showDocument(uri) to open a browser to the given url. I have run into a problem though; I cannot open up urls that contain Chinese characters. It can only interpret them as '?', taking you to the wrong url. AWT's Display.browse(uri) handles characters without a problem, so I know that it can be communicated to the browser technically. I'm not sure if there is anything I can do on my end or not though.
My question is: Is there any way to make JavaFX's HostServices.showDocument() correctly read in Chinese characters?
EDIT:
Sample string
http://www.mdbg.net/chindict/chindict.php?page=worddict&wdrst=0&wdqb=%E6%96%87
You can follow the link through to see the address' chinese character (at the very end of the url). So in doing this, I noticed that it converts the character to a series of %, letters, and numbers. Plugging those into showDocument() in place of the character works fine. So then, I guess the question is now "How do I convert a character to this format?

I was able to figure out that converting the string into a URI, then using the .toASCIIString() method gave me what I needed. (Converting Chinese characters, and I would assume others, into something readable by showDocument(). Thanks for the help jewelsea.
If there is a better way to do this, feel free to give me another answer.

How do I handle non-English characters properly?

So I'm working with last.fm API. Sometimes, the query results in tracks that contain characters like these:
Æther, é, Hṛṣṭa
or non-English characters like these:
水鏡.
When debugging in Eclipse, I see them just fine (as-is) but printing on console prints these as ??? - which is OK for me.
Now, how do I handle these? At first I though I could remove every song that has any character other than the ones in English language. I used the regex ^\\w+$ but it didn't work. I also tried \\w+. That didn't work either.
Then I thought further on how do handle these properly. Any one can help me out? I am perfectly fine with letting these tracks out of the equation, ie. I'm fine with having only English character tracks.
Another question: What is the best way to display these character of console and/or Swing GUI?

You must ensure that you use correct encoding when reading your input first.
Second ensure that the font used in Eclipse on platform you developing has ability to display all these characters. Swing must display unicode chars if you read them correctly.
You will likely want to use UTF-8 everywhere.

Print arabic string in java

I'm trying to display arabic text in java but it shows junk characters(Example : ¤[ï߯[î) or sometimes only question marks when i print. How do i make it to print arabic. I heard that its something related to unicode and UTF-8. This is the first time i'm working with languages so no idea. I'm using Eclipse Indigo IDE.
EDIT:
If i use UTF-8 encoding then "¤[ï߯[î" characters are becoming "????????" characters.

For starters you could take a look here. This should allow you to make Eclipse print unicode in its console (which I do not know if it is something which Eclipse supports out of the box without any extra tweaks)
If that does not solve your problem you most likely have an issue with the encoding your program is using, so you might want to create strings in some manner similar to this:
String str = new String("تعطي يونيكود رقما فريدا لكل حرف".getBytes(), "UTF-8");
This at least works for me.

If you embed the text literally in the code make sure you set the encoding for your project correctly.

This is for Java SE, Java EE, or Java ME?
If this is for Java ME, you have to make custom GlyphUtils if you use LWUIT.
Download this file:
http://dl.dropbox.com/u/55295133/U0600.pdf
Look list of unicode encoding..
And look at this thread:
https://stackoverflow.com/a/9172732/1061371
in the answer (post) of Mohamed Nazar that edited by bernama Alex Kliuchnikau,
"The below code can be use for displaying arabic text in J2ME String s=new String("\u0628\u06A9".getBytes(), "UTF-8"); where \u0628\u06A9 is the unicode of two arabic letters"
Look at U0600.pdf file, so we can see that Mohamed Nazar and Alex Kliuchnikau give example to create "ba" and "kaf" character in arabic.
Then the last point that you must consider is: "Make sure your UI support unicode(I mean arabic) character."
Like LWUIT not support yet unicode (I mean arabic) character.
You should make your custom code if you mean your app is using LWUIT.

Add a language to my search engine, arabic letters in Eclipse

I want to do a search engine in arabic, and i have already a code for searching in english I had just to change the Analyzer but when i wrote in arabic in the console, I change to UTF-8 and i get 0 found so I think that eclipse give the arabic word to the query in a code , and the query doesn't recognize this code, my question is how can I do to make the arabic word readable to the query?
QueryParser parser = new QueryParser(Version.LUCENE_30,
"contents", new ArabicAnalyzer(Version.LUCENE_30));

Try looking in project properties, in the "Resource" section. Set your text file encoding to UTF-8 & see if that fixes the problem. I am assuming you have the right fonts already installed.

I believe you are reading characters like this:
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
try {
String token = reader.readLine();
System.out.println(token);
} catch (IOException e) {
e.printStackTrace();
}
In that case character encoding is exactly the same as current system code page (at least in Windows). The problem is, Eclipse will allow you to paste Arabic letters to its console window but will lose information during the process. I am not sure if setting System code page (in OS Regional options) to windows-1256 will help but it could. I have tried to pass Charset.forName("windows-1256") as a second parameter to InputStreamReader and then input something with Arabic keyboard but it does not work.
OK, but we are not so helpless after all. Since that is meant for testing (right?), you can follow one of two approaches to fix the problem:
Use some basic Swing UI (JFrame + JTextField + JLabel and maybe some button)
Provide unescaping mechanism and enter characters as code points (i.e. \u0629)
The best fix would be to fix Eclipse (which is broken) and for example implement Console (System.console()) but I am not so sure if they would accept such patch.

You can try to give Unicode symbols in the console instead of Arabic characters.
Use a converter like this one to convert your Arabic text to Unicode symbols.