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YoMars
Joined: 16 Jun 2012
Posts: 1
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 Posted: Sat Jun 16, 2012 7:24 am Post subject: Console problem? |
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Hello,
I am new to java, and attempted to write a very simple program below shown below:
| Code: |
package Chapter2;
import tio.*;
class SimpleInput {
public static void main (String args[]) {
int width, height, area;
System.out.println("Type 2 integers for" +
" the width and height of a box");
width = Console.in.readInt();
height = Console.in.readInt();
area = width * height;
System.out.print("The area is ");
System.out.println(area);
}
}
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I get an error with the import tio.* as it doesn't find the package tio (and therefore Console.in isn't recognised), I've looked at the bufferedstreams, but I was wondering what the current problem with this is, or if it is simply outdated?
Sorry if its a bit of an obvious question, tried to do some searching but it came up blank, so any help would be appreciated  |
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netero
Joined: 25 May 2009
Posts: 207
Location: Switzerland
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| Posted: Sat Jun 16, 2012 11:56 am Post subject: |
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Hello,
I probably found what is tio here: http://users.soe.ucsc.edu/~charlie/java/tio
Unless I am making a mistake, this package is not included in Oracle's or OpenJdk java JDKs. Anyways NetBeans seems to ignore that package.
If you want to have in in your environment, I suggest you this:
(1) download the Tio package from somewhere
- on the link above there is a dowload link, I don't know if it is the one you want
(2) create a "Tio" library
- menu: Tools => Libraries
- click the "New library" button (may not be visible at once, use the scrollbar)
- add a .jar containing your Tio package.
(3) Link your new Library to your project
- right click on your project, select "Properties"
- select "Libraries", then "Compile tab", and "Add library"
Does all this help you?
regards
netero |
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Gary Greenberg
Posted via mailing list.
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| Posted: Mon Jun 18, 2012 1:49 am Post subject: Console problem? |
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No wonder it won't find it. I am working in Java for 15 years and I have no idea what the package tio is about.
May be you meant java.io.*? It is actually not a good practice to import whole packages when you need just one class out of it.
You can do
Console console = System.console();
if(console != null) {
width = console.readInt();
...
}
Have to warn you. If your program is not started from the command line System.console() always return null.
That include launching your code from within the IDE (Netbeans). It makes it difficult to debug.
You can use some other Java libs to overcome that difficulty. For example scala.Console class has a bunch of static methods for that.
Have fun
On 6/16/2012 12:24 AM, YoMars wrote: | Quote: | | Quote: | Hello,
I am new to java, and attempted to write a very simple program below shown below:
Code:
package Chapter2;
import tio.*;
class SimpleInput {
public static void main (String args[]) {
int width, height, area;
System.out.println("Type 2 integers for" +
" the width and height of a box");
width = Console.in.readInt();
height = Console.in.readInt();
area = width * height;
System.out.print("The area is ");
System.out.println(area);
}
}
I get an error with the import tio.* as it doesn't find the package tio (and therefore Console.in isn't recognised), I've looked at the bufferedstreams, but I was wondering what the current problem with this is, or if it is simply outdated?
Sorry if its a bit of an obvious question, tried to do some searching but it came up blank, so any help would be appreciated
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