A Java Card applet typically uses less bytecode than the hypothetical Java applet obtained by compiling the same Java source code.
This conserves memory, which is a necessity in resource constrained devices like smart cards. As a design tradeoff, there is no support for some Java language features as mentioned above , and there are size limitations. Techniques exist for overcoming the size limitations, such as dividing the application's code into packages below the 64 KB limit. Standard Java Card class library and runtime support differs at lot from that in Java, and the common subset is minimal.
Transients non-persistent, fast RAM variables that can be class members are supported via a Java Card class library; they have native language support in Java. Coding techniques used in a practical Java Card program differ significantly from what is used in a Java program.
Java Card uses a precise subset of the Java language; this speeds up the learning curve and enables using a Java environment to develop and debug a Java Card program. Even if debugging occurs with Java bytecode, you should make sure that the class file fits the limitation of Java Card language by converting it to Java Card bytecode.
Also, test in a real Java Card smart card early on to get an idea of the performance. Peter V. As specified above, none of the methods of your Deck, Hand, and Card classes do any output. A zip file of your NetBeans project folder 2. Include a file containing the output of 3 hands.
If you do, the zip will not contain the dist folder where the html files are stored and you will be unhappy with the grade. If the card is of a suit that is not yet in the Hand Insert it as the new last card in the Hand. If the value is higher than all the cards of that suit Insert it as the new last card of that suit. For each card, insert it in its proper place in the list for that suit, using the techniques described above. A method stub is just the Javadoc comment, the method heading, and an empty body.
If the method returns a value, use some temporary return value. Since the Hand class method fill is the most challenging, start with a temporary version that simply adds each card to the hand. Hint: To enable your Hand class to seamlessly access the Deck, create a Deck object in your Hand cla. Discrete Mathematics. Ethical Hacking. Computer Graphics. Software Engineering. Web Technology. Cyber Security. C Programming. Control System. Data Mining.
Data Warehouse. Viewed 2k times. So that's question one: numeric or alphanumeric? Improve this question. Rann Lifshitz 3, 4 4 gold badges 21 21 silver badges 40 40 bronze badges. Mark Mark 4, 10 10 gold badges 50 50 silver badges 97 97 bronze badges. Regarding your partially redeemed keys : Why not deprecate the original key and create a new random key for the partially utilized gift card? In effect - you recerate the gift card with a lower balance.
Looks like the secure key generation issue is also nicely discussed here: stackoverflow. ErwinBolwidt I will place this one on security. Yes it's a startup company with only 3 developers so we are free to decide this ourselves — Mark.
RannLifshitz yes one of the solutions i'm considering is to deprecate the original key and create a new one for the balance outlined above in question — Mark.
I hope I understand your concept correctly. But I wouldn't send informations such as giftcodes over third party servers. I would use a system like paypal or paysafecard.
If a user want to pay something with a giftcard, he will be forwarded to your server to enter the code. You then notify the third party that the payment was successfully or not. Show 6 more comments. Active Oldest Votes. So there are two types of transactions. Hope this was of some help, Cheers! Improve this answer. Haris Nadeem Haris Nadeem 1, 9 9 silver badges 24 24 bronze badges. AndreiMarcut I agree. But since someone on another forum already gave a very good technical answer, I thought this answer might spark some ideas.
For example, build the system on top of an Ethereum block chain and manage the computer nodes yourself That too is probably far from the product's scope and would create a needless dependency.
I do think that the idea of a 2 transaction type model is implementable though. Add a comment. I went through all the replies and came up with a solution, taking into account the suggestions: We generate a link to send to the user.
In the contract with the online store, we specify they cannot log or save the gift card code anywhere our 2 clients are large well known online retailers On our client's online store checkout page, to pay with our gift card code, the user provides the 16 character gift card code.
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