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TorstenH. wrote: doesn't that mean C#-Developers just need more help
Not necessarily; but it may mean that more people are learning and using C#. Which, perhaps, may mean there are more people to call on for assistance. Personally, I have no preference on language. I am primarily a C/C++ developer, but I have used Java quite a lot, and am learning C# now.
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Hi,
you won't find a single language that is best for all of those domains.
OS programming isn't handled well (or at all) by either .NET languages (such as C#) or Java.
almost anything CAN be done in C or C++.
Windows programming is great in .NET, especially in C#.
Mobile devices are best served by Java, unless they support .NET, then C#.
The easiest to learn are C# and Java (and both are rather similar).
Conclusion: if you want to do it all, you'll bound to use a couple of languages.
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how to install more than one jvm in single machine.
can any help me writing code for it
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Why would you want that?
You have the thought that modern physics just relay on assumptions, that somehow depends on a smile of a cat, which isn’t there.( Albert Einstein)
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i m doing the project dats y i want.
now can u tell me
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Installing multiple copies of Java on a single machine is a fairly trivial task. If you give us more information about what you are trying to achieve or what problems you are having, we might be able to help you more with your problem.
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i want to install different versions of java or can say that jdk or jre in same directory.
so for this i want to develop te code or software which will be showing different version of jvm that are being instaled and when i try to install a new version then it will show the previous one that it is already there and will show the new one which i want to install and when i select the new one then it will install it.when i want to or wish that jvm will run according to it.
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From a simplistic view, when you run a program it will be launched using the correct jre. You should not need to worry about installing multiple runtimes as they are designed to be able to run different versions on one physical box.
At development time, if you use netbeans you can specify the runtime to use; the information is in the help files.
Panic, Chaos, Destruction.
My work here is done.
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same goes for eclipse.
You can install more than one vm and choose on the preferences which vm eclipse should use - and you can choose which vm the specified project should use.
It's better to keep your vm updated and simply switch compilance levels.
I never finish anyth...
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FlapJacks
For this exercise, you will simulate a stack of flapjacks that gets flipped. The stack is really just an array of integers. The flapjacks always start out in regular numbered order. For example, a stack of 10 flapjacks would look like this:
0
1
2
3
4
5
6
7
8
9
Now, you will let your user "flip" all or some of the flapjacks by entering a number, which is the index of the number under which to put the "spatula". For example, if I want to flip the first 6 flapjacks I would call flip of index 5, which would change my flapjack stack to look like this:
5
4
3
2
1
0
6
7
8
9
Now, I can flip this stack at index 7 to get this stack:
7
6
0
1
2
3
4
5
8
9
Your mission consists of two methods. You have to first figure out how to perform the flip operation, then you should create a method that figures out how to flip any mixed-up stack back into original order. You CANNOT just make a new array that is sorted and return that. You must "flip" the stack back to sorted order. You should also not flip randomly until it is sorted. Although chances are that this will eventually work, it will take a very long time for large stacks. Your code should call the flip method and the find method that is given to you.
This is a logic puzzle. The code is easy if you can figure out the algorithm...
The code, except for the two methods for you to make, is in this file: FlapJacks.java (I included the code below)
import javax.swing.*;
public class FlapJacks {
public static void main(String[] args) {
// Put whatever number you want here. This is the
// number of "pancakes" to flip.
final int STACK_HEIGHT = 10;
int[] stack = getArray(STACK_HEIGHT);
printStack(stack);
String quit = "y";
while(quit.equals("y")){
String s = JOptionPane.showInputDialog(null, "Where should I flip?");
int i = Integer.parseInt(s);
stack = flip(stack,i);
printStack(stack);
quit = JOptionPane.showInputDialog(null, "Type y to continue flipping.");
}
stack = sortStack(stack);
printStack(stack);
System.exit(0);
}
// Create an array of len items, where the first number is 0, the second
// number is 1, and so forth.
public static int[] getArray(int len){
int[] answer = new int[len];
for(int i=0; i<len; i++){
answer[i] = i;
}
return answer;
}
// Prints all the elements of an array vertically
public static void printStack(int[] stack){
String toPrint = "";
for(int i = 0; i<stack.length; i++){
toPrint = toPrint + stack[i] + '\n';
}
JOptionPane.showMessageDialog(null,toPrint);
}
// Find the index of a certain number in the array
// Returns either the index where the number was
// found, or -1 if the number wasn't found.
public static int find(int numToFind, int[] array){
for(int i = 0; i<array.length; i++){
if (array[i] == numToFind){
return i;
}
}
return -1;
}
// High is the index under which I put my "spatula" and flip the
// stack over.
public static int[] flip(int[] stack, int high){
}
// Perform a series of flips until the stack is back in order.
public static int[] sortStack(int[] stack){
}
}
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Very impressive. So now we know you're capable of cutting and pasting.
All indications are you're incapable of reading, though. Please read the forum guidelines and use the 'code block' tag, once you've learned how to ask a proper question.
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Aurelius4466 wrote: Your mission
That is to say, you should at least try and work out the puzzle. If you have a specific question then come back later and people may try and help, but we are not here to write your code and help you pass your examination.
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Hint look at the problem Horizontally,
index 0 1 2 3 4 5 6 7 8 9
original array 0 1 2 3 4 5 6 7 8 9
Result on index 5
index 0 1 2 3 4 5 6 7 8 9
new array 5 4 3 2 1 0 6 7 8 9
7 6 0 1 2 3 4 5 8 9
6 7 0 1 2 3 4 5 8 9
0 6 7 1 2 3 4 5 8 9
1 0 6 7 2 3 4 5 8 9
0 1 6 7 2 3 4 5 8 9
.
.
.
.
etc
What do you conclude?
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Please how do i configure pulsar to work properly with JAVA in JME.
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When we use interfaces?
when we use abstract classes?
when we use singleton class
explain with senarios exactlly
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First, the word is PLEASE, use vowels and people won't be hostile. It would be nice to have a title that describes the question as well.
Now, interfaces, abstract classes and the singleton pattern are NOT java ideas, they are Object Orientation concepts. I will try to explain them in one[ish] sentence each.
An interface is a definition of methods that must be supported but the implementation is left to the classes that use it. If you had an interface Move to be used by Animal classes, the way that each Animal moves is not important just that they must be able to move.
Abstract classes are classes that do not support instances but are concrete ideas in themselves. Think of the class Animal, it is abstract, every Animal is actually a more specialised thing - Dog, Cat, VB Programmer, Slug – they are all a type of Animal and can be addressed as an Animal, you just can not create an Animal.
The Singlton Pattern is a well established concept with a known implimentation. We want to ensure there is one and only one instance of a particular class; thing Highlander in code. To do this, the class will have a static instance of itself that is created the first time it is called.
Panic, Chaos, Destruction.
My work here is done.
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Nagy Vilmos wrote: Dog, Cat, VB Programmer, Slug
Nah. VB Programmer is not only oxymoronish, it also isn't a valid identifier, so it can't be a class name.
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Nagy Vilmos wrote: use vowels
Vowels are letters; in English, a,e,i,o,u, and sometimes y. I think you meant verbs.
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LunaticFringe wrote: Vowels are letters
and
Nagy Vilmos wrote: First, the word is PLEASE, use vowels [...]
I don't think I was talking about verbs. The word 'please' with its vowels removed is 'pls' which is somewhat like 'plz'. I may be 42 but I do understand these things.
Panic, Chaos, Destruction.
My work here is done.
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Nagy Vilmos wrote: I may be 42 but I do understand these things.
Nonsense, you're far too young.
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Ah. I figured you were talking about the lack of verbs -- 'When we use interfaces' as opposed to 'Whend DO we use...'.
It seems there was something in the OP's message to irritate everyone.
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hi , i want to develop an application in Java where one person will share screen with several people joining the conference , just need some help for start up. please share some links or help code to begin with.
I have no idea which technology i can use,how it's work flow.
Please anybody knows about that please help me.
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Have a read of the forums.
We will not do your work for you, but will happily help. Try, get stuck and THEN ask a question.
Panic, Chaos, Destruction.
My work here is done.
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You would need to look into the java.awt.Robot class to capture the screen. Just search for this class and you will get several tutorials explaining how to use it. But remember, this class just captures images of your desktop.
You would then have to send those images over the network to other computers using an implementation of either Datagram (UDP-based) or TCP-based Sockets or RMI.
Plus, also look into Serialization. These are the only pointers I can give you. People do not write tutorials about such stuff. I hope this helps you find a suitable direction to move forward in.
The beginning of knowledge is the fear of God
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