uniqueidentifier

问题 I'm needing to get a unique method identifier to use as a key on a HashMap. I'm trying to do something using stacktrace and reflection and user the method signature. But the problem is I didn´t find a way to retrive the complete method signature (to avoid methods overload). Edited I would like that somethink like this works: public class Class1 { HashMap<String, Object> hm; public Class1() { hm = new HashMap<String, Object>(); } public Object method() { if (!containsKey()) { Object value; ...

问题 Background I have a simple media client/server I've written, and I want to generate a non-obvious time value I send with each command from the client to the server. The timestamps will have a fair bit of data in them (nano-second resolution, even if it's not truly accurate, due to limitations of timer sampling in modern operating systems), etc. What I'm trying to do (on Linux, in C), is to generate a one-to-one sequence of n-bit values (let's assume data is store in 128bit array-of-int

问题 I receive bytes from an RFID reader when presenting a card, but I'm unable to figure out how to derive the card ID from these bytes. For example, I have a card that has these numbers printed on it: 0007625328 116,23152 . I would expect that this is the ID of that card, right? For this card, I get the following bytes from the reader (in hexadecimal representation): <42><09><01><74><00><74><5A><70> . 回答1: The decimal number 0007625328 translates to 0x00745A70 in hexadecimal representation. The

问题 Is there any way which I can get some specific identifier/serial number of current SD Card in Android devices programmatically? 回答1: Yes, try this: public String getSDCARDiD() { String sd_cid = null; try { File file = new File("/sys/block/mmcblk1"); String memBlk; if (file.exists() && file.isDirectory()) { memBlk = "mmcblk1"; } else { //System.out.println("not a directory"); memBlk = "mmcblk0"; } Process cmd = Runtime.getRuntime().exec("cat /sys/block/"+memBlk+"/device/cid"); BufferedReader

问题 I would like to get a few ideas on generating unique id's without using the GUID. Preferably i would like the unique value to be of type int32. I'm looking for something that can be used for database primary key as well as being url friendly. Can these considered Unique? (int)DateTime.Now.Ticks (int)DateTime.Now * RandomNumber Any other ideas? Thanks EDIT: Well i am trying to practise Domain Driven Design and all my entities need to have a ID upon creation to be valid. I could in theory call

问题 I have a situation where by I need to create tens of thousands of unique numbers. However these numbers must be 9 digits and cannot contain any 0's. My current approach is to generate 9 digits (1-9) and concatenate them together, and if the number is not already in the list adding it into it. E.g. public void generateIdentifiers(int quantity) { uniqueIdentifiers = new List<string>(quantity); while (this.uniqueIdentifiers.Count < quantity) { string id = string.Empty; id += random.Next(1,10);

问题 I have a list of 75200 words. I need to give a 'unique' id to each word, and the length of each id could be 3 letters or less. I can use numbers, letters or even symbols but the max length is 3. Below is my code. import java.io.*; import java.util.*; public class HashCreator { private Map completedWordMap; private String [] simpleLetters = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"}; private String[] symbols = {"!","@","#","$","%",

问题 I have a list of 75200 words. I need to give a 'unique' id to each word, and the length of each id could be 3 letters or less. I can use numbers, letters or even symbols but the max length is 3. Below is my code. import java.io.*; import java.util.*; public class HashCreator { private Map completedWordMap; private String [] simpleLetters = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"}; private String[] symbols = {"!","@","#","$","%",

问题 I need to find out if a commit belongs to a particular git repository. The idea is to generate some unique id for every repository I need to test. Then I can compare this unique id to the id, calculated from tested commit. For example take an SHA of initial change set. Can it uniqely identify the repository? 回答1: The SHA1 key is about identifying the content (of a blob, or of a tree), not about a repository. If the content differ from repo to repo, then its history has no common ancestor, so

问题 I need to find out if a commit belongs to a particular git repository. The idea is to generate some unique id for every repository I need to test. Then I can compare this unique id to the id, calculated from tested commit. For example take an SHA of initial change set. Can it uniqely identify the repository? 回答1: The SHA1 key is about identifying the content (of a blob, or of a tree), not about a repository. If the content differ from repo to repo, then its history has no common ancestor, so