Originally posted by Killer42
Ohhh!! hahahahh,
Python....
To those java lovers that have experience in Python,
What can you say about Python? Good?
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Ohhh!! hahahahh,
Python....
To those java lovers that have experience in Python,
What can you say about Python? Good? -
Download and view the slides from here: Why I love Python
Python is good for desktop, web programming, mobile phone programming and game programming! (search google using 'pygame')
Python is one of the three official languages of Google (other two are, C++ & Java).
And you can also read: python vs java and python is not java
Life is short ~ you need python. (But again, life is short, so you don't need a python to kill you) ;)
regards,
Subeen.
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If my Applets can be embed in Python, then i will try!!!!
I will use it... If not or there is a limit, then i will not...Comment
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Can't begin to imagine, venturing uncharted waters:-)You do realise, of course, that you could be excommunicated from the VB community for such heresy?
It's a humbling experience, truly spectaular actually...
Of course us Java Samaritans will gently adopt the wise soul who saw the light
and found the truth; we'll ignore the drooling ugly vb-droids that blindly, gnawing,
wobble around in their own smelly droppings while looking silly all over; halleluya!
kind regards,
Jos ;-)
Apprentice thus far, give and take I say two three years of intense studying, I can be be a good Samaritan, perhaps as skilled as you, I suspect you're having fun with it:-)Java is cool.
I am inviting all of you to try Python. If you are a good Java programmer, you will be surprised :-)
regards,
Subeen
Perhaps more JAVA, hee hee...
Sure?
What is in Phyton that has not on java?
Enjoy your week-end everyone...
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So, köll, how are your Applets? My Servlets are terrible. See my thread about them. BTW, unless you object, I'm changing this thred title to Köll & Sam Classroom BlogComment
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Forgot to reply to your post 117 & 118:
You won't love to do Servelets in Java! But, C# plays very well with XML. And, C# is exactly like Java only much more consistent, better generics, has DotNet framework, and has real properties.Originally posted by Dököll in 117
My book is Java Programming by Shelly/Cashman/et alOriginally posted by Dököll
For Liskov, see http://en.wikipedia.org/wiki/Liskov_...tion_principleComment
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And he is a she; her name is Barbara Liskov; I wrote a 'howto' lately about herOriginally posted by SammyB
substitution principle. In ordinary terms the substitution principle states that
if a program P using a class B has result R then for a class D if P has the same
result R on it, i.e. P(B) == P(D) then D *can be* a subclass of B. Read my
little article about it and keep that substitution principle in mind whenever you
want to design a derived class.
kind regards,
JosComment
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Good to know that much more about C# thanks, and also thanks for providing the information on your book, and on Liskov, should take a look at that howto... I am running to finish a project, in a bit:-)You won't love to do Servelets in Java! But, C# plays very well with XML. And, C# is exactly like Java only much more consistent, better generics, has DotNet framework, and has real properties.Comment
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Don't know if you're still doing Applets, but if so try JApplet instead of Applet. It allows you to use all of the Swing conponents. I'm using it for my final project: can't believe that we never used them.Originally posted by DököllComment
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That's a good idea, JApplet huh! Will definitely look into that. Hats off on the name of the thread Sam... By the way, let's drill our teeth into this one.Originally posted by SammyB
I have been at this for almost two weeks. I want to modify below code to restrict letters in input box and to also look at a number and decide whether valid or not and to continue.
[CODE=JAVA]
public int getAge(String prompt) {
String inputStr;
int age;
while (true) {
inputStr = JOptionPane.sho wInputDialog(nu ll, prompt);
try {
age = Integer.parseIn t(inputStr);
if (age < 0) {
throw new Exception("Nega tive age is invalid");
}
return age; //input okay so return the value & exit
} catch (NumberFormatEx ception e) {
JOptionPane.sho wMessageDialog( null, "'" + inputStr
+ "' is invalid\n"
+ "Please enter digits only");
} catch (Exception e) {
JOptionPane.sho wMessageDialog( null, "Error: "
+ e.getMessage()) ;
}
}
}
[/CODE]
It is calculating user's age. This works fine, I just need to make below work nicely with above code:-o):
[CODE=JAVA]
while (loanAmount < 100 || loanAmount > 1000000) {
JOptionPane.sho wMessageDialog( null,
"Invalid entry, please enter number between 100 and 100000");
inputStr = JOptionPane.sho wInputDialog(nu ll,
"Loan Amount (Dollars + Cents):");
loanAmount = Double.parseDou ble(inputStr);
}
[/CODE]
Above works also and I have managed to get them to work hand in hand, except for when I fall out of the loop, I get n error, even though it works up until then.
Let me comment the code and run it. then will post. But with the above how do you see in your own way where one can restrict letters being entered in our input box, of course accept only numbers but of a certain value. If I could get some guide or an idea, however best to approach it, I may be able to get it.
How would you handle this one?
Thanks!
KöllComment
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As you said, you want to rewrite the second to look like the first, so you make the while loop into while (true) and move the range test into the non-negative test. But, better yet, combine them both into one function that has inputs: the range & an error message. The function then prompts, parses, range checks, loops on an exception until you have a good number that it returns. Then you don't clutter up your program with all of the ugly try catch. However, you also should allow the user to bail out of that loop by throwing its own "bail-out" exception, but that's probably too advanced for you now.
BTW, did you know that you can have Eclipse write the try-catch for you? Just select the code and use the Source, Surround with... menu. Even better, in a class, after defining the properties at the top, you can select them and use the Source, Generate Getter & Setters... to generate all of those methods for you. Very cool!
Back to the first subject, of course what you really want is a numeric textbox control, then you could make your own input box. Cannot find any such control, but I'm sure it exists. Where is it, Jos?Comment
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It doesn't exist but all the building blocks are there (as you already know).Originally posted by SammyB
It'd be easy to write your own version, possibly including range checks.
kind regards,
JosComment
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Well, as Jos says, it is easy, I just modified the UpperCaseField example in http://java.sun.com/j2se/1.4.2/docs/...TextField.html, but I really don't understand it. I let Jos explain my code.Originally posted by JosAH
Here is the test driver:
[code=java]
import java.awt.*;
import javax.swing.*;
public class NumericTest extends JApplet
{
public void init()
{
JPanel p = new JPanel();
p.setLayout(new GridLayout(1,2) );
JLabel lbl = new JLabel("Enter Number:");
NumericField tb = new NumericField(1) ;
p.setBackground (Color.LIGHT_GR AY);
p.add(lbl);
p.add(tb);
this.getContent Pane().add(p);
this.setSize(20 0, 40);
}
}
[/code]
and here is the NumericField class
[code=java]
import javax.swing.*;
import javax.swing.tex t.*;
public class NumericField extends JTextField
{
public NumericField(in t cols)
{
super(cols);
}
protected Document createDefaultMo del()
{
return new NumericDocument ();
}
static class NumericDocument extends PlainDocument
{
public void insertString(in t offs, String str, AttributeSet a)
throws BadLocationExce ption
{
if (str == null)
{
return;
}
char[] c = str.toCharArray ();
StringBuilder s = new StringBuilder() ;
for (int i = 0; i < c.length; i++)
{
if (Character.isDi git(c[i])) s.append(c[i]);
}
super.insertStr ing(offs, s.toString(), a);
}
}
}
[/code]Comment
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Great help here guys, thanks. Will go to work on your examples Sam, try to build my own from it.
In a bit, and thanks also for the link!
KöllComment
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