|
Pinguin2011 wrote: I'm really blocked I do not know how to start my application.
1. Learn basics of java
2. Learn basics of programming java on Android
3. Learn basics of implementing a java server with a web interface.
4. Learn how to write an Android app that can talk to a server
5. Learn basics of C
6. Learn how to make C and Java talk to each other (I suggest using application via Runtime rather than JNI.)
7. Collect requirements for your Android App and Server
8. Design a system (more than one application) using all you have learned and based on 7.
9. Implement the design.
10. Unit test the design.
|
|
|
|
|
Hi,
I'm writing a simple visitor-based analysis in Java using Eclipse. Here I have to implement a tree-walker analysis within Crystal. But I wanna know the difference (advantages/disadvantages) between implementing the visitor class inside the analysis class or outside that.
Ex: Inner visitor class
public class MyAnalysis extends AbstractCrystalMethodAnalysis {
...
private class MyVisitor extends ASTVisitor {
...
}
...
}
I really appreciate if some can tell me the difference between these two implementations.
|
|
|
|
|
I would turn the question around and ask: why do you want to make the visitor a private inner class? What are you hoping to gain by doing that?
|
|
|
|
|
I'm new to this stuff. I was following some sample codes and there I saw inner-class implementations. So I wonder what's the difference between inner and outter implementations. BTW I'm implementing the AST visitor as a public class even inside the Analysis class.
|
|
|
|
|
Usage of inner classes is one of those things that some Java coders get very worked up about, for and against. Personally, I don't much like them but they have their uses.
There are plenty of opinions on the net about whether to use them, when to use them, how to use them. For every one person who says "Do it this way" you will find another who says "Don't do it that way".
The one thing I would say is: if you are making AST Visitor publicly visible outside Analysis, why not just make it an outer class on its own? What do you gain by making it an inner class of Analysis?
|
|
|
|
|
I want to run an exe file in my project.
I mean when I run my codes,a specific executable file run.
How can I do that?
|
|
|
|
|
I expect you want to use the Runtime[^] class.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
|
|
|
|
|
Since 1.5 ProcessBuilder has been recommended over Runtime. Having said that, I still use Runtime because it's what I'm used to and old habits die hard.
|
|
|
|
|
I used Google to check; it's a while since I sat and read the latest documentation and guidance notes.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
|
|
|
|
|
tell me about Layout Managers
i want to use it in my applet programes
|
|
|
|
|
I have already made a suggestion here[^]. Please do not repeat the same question in multiple forums.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
|
|
|
|
|
hi...I'm writing a program for converting nfa to dfa...for getting alphabet and rules(which are array) and other elements in nfa (which are not arrays) I've defined a "NFA" class and for converting another class "NfaToDfa"...when I create an object from "NFA" class and I want to use for example "getrules" method in "NfaToDfa" there's an error...notice that for the other elements which are integer or...(anything except array) there's no error...what can I do ?
NFA NFATo=new NFA();
String[ ][ ] Rules=new String[100][3];
Rules=NFATo.getRule();
String[] alphabet=new String[27];
alphabet=NFATo.getAlpha();
I have error in line 3 and 5...the error is "cannot find symbol"...can anyone help me with this problem ?
|
|
|
|
|
What symbol can the compiler not find, i.e. post the full text of the error message.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
|
|
|
|
|
the error is :
cannot find symbol
symbol: class Rules
location: class nfa2dfa.NfaToDfa
<identifier> expected
cannot find symbol
symbol: method getRule()
location: class nfa2dfa.NFA
|
|
|
|
|
and the same error for "getAlpha"...
|
|
|
|
|
Well that seems quite clear, the run time system cannot find method getRule().
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
|
|
|
|
|
well...I know what the problem is but I don't know how to solve it ! because I've already defined "getRules" method in NFA class...and there's no error in that method...
|
|
|
|
|
Then I can only assume that you are running a different version of your program, or some class is not in the correct place. Given the information you have provided here I cannot begin to guess what the structure of your classes is or how you are running the program. I would suggest you use your debugger to try and find out what is happening.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
|
|
|
|
|
I just copied the 5 lines of code in your original message into a Java program, added implementations for the constructor and two methods and it works fine. What are you doing that is different?
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
|
|
|
|
|
OK, I've figured out what the problem may be. If you are manually compiling the class that uses NFA then you need to be in the correct directory for the compiler to find the class. If these classes are in a package then you need to start from the directory above the package directory. For example if class NFA is in directory test, and NFA is part of package test then you need to compile from the next higher directory as follows:
C:\Documents\Java\testing>dir test
Volume in drive C is System
Volume Serial Number is F28F-2710
Directory of C:\Documents\Java\testing\test
28/01/2012 13:20 <DIR> .
28/01/2012 13:20 <DIR> ..
28/01/2012 12:44 1,000 MyTest.java
28/01/2012 12:44 1,598 NFA.class
28/01/2012 12:44 917 NFA.java
2 File(s) 3,515 bytes
2 Dir(s) 177,110,560,768 bytes free
C:\Users\Richard\Documents\Java\testing>
javac -cp . test/MyTest.java
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
|
|
|
|
|
Member 8586072 wrote: but I don't know how to solve it ! because I've already defined "getRules"
Presumably that is just a problem in your post rather than in what you implemented because that is not the method that is missing.
|
|
|
|
|
See my last answer above.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
|
|
|
|
|
|
What is this to do with Java?
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
|
|
|
|
|
Sorry posted in the wrong Forum
Vuyiswa Maseko,
Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.
C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.com
vuyiswa[at]dotnetfunda.com
http://www.Dotnetfunda.com
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
