Topic: == How do I do this simple thing in JAVA? ("cin << " in C++ ) ==

== How do I do this simple thing in JAVA? ("cin << " in C++ ) ==

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Posted By: joey_corleon
Posted On: Saturday, October 26, 2002 02:55 AM

Hi,

I am currently making a java test tool.
My problem is that I don't know how to get the user's entries :o(

In C++ for instance I would use cin < < ..etc ...

How do I do in JAVA to retrieve the entry of the user????

In some cases I need to retreive a single letter corresponding to an option in a menu (e.g. an option in the menu e.x. 1, 2, 3 etc ...) - In other case I need to retrieve words or sentances ...

Thanks for your help!

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Re: == How do I do this simple thing in JAVA? ("cin << " in C++ ) ==

Posted By: Joe_Cheng
Posted On: Sunday, October 27, 2002 05:25 AM

If you want to get fancy, you can use the static methods on JOptionPane to pop up dialog boxes. :)

For example:

String firstName = JOptionPane.showInputDialog("What is your first name?");

There are other methods on this class to create Yes/No prompts, drop-down option lists, etc.

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Re: == How do I do this simple thing in JAVA? ("cin << " in C++ ) ==

Posted By: Jeanne_Boyarsky
Posted On: Saturday, October 26, 2002 02:36 PM

It's much easier in C++ than Java. First you have to open a reader. Then read in the appropriate data type.


BufferedReader in
   = new BufferedReader(new InputStreamReader(System.in));
char ch = in.read();
String s = in.readLine();

Note that all of this must be done inside a try/catch block for an IOException.

Other related classes:

If you want a numeric data type, you have to parse it:
```
 Integer.parseInt(string) 
```

If you want to parse words, you should use StringTokenizer

Fuller descriptions are in the API. Very useful once you know the name of the class to look under :)

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Re: == How do I do this simple thing in JAVA? ("cin << " in C++ ) ==

Posted By: Eelco_Hillenius
Posted On: Saturday, October 26, 2002 06:14 AM

To begin with... learn how to use search engines!

See this for a simple example or this (TextReader.java) for an idea of a helper class.

Or just learn how to work with the Java io package.

Good luck,
Eelco

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