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- Unique Key in SQL. A unique key is a set of one or more than one fields/columns of a table that uniquely identify a record in a database table. You can say that it is little like primary key but it can accept only one null value and it cannot have duplicate values.
- When you generate random numbers it's often the case that each generated number number must be unique. A good example is picking lottery numbers. Each number picked randomly from a range (e.g., 1 to 40) must be unique, otherwise, the lottery draw would be invalid.
- Just a quick note that if you happen to be looking for a license key generator (or 'license key manager') for a Java desktop (Swing) application, I've been taking a look at the TrueLicense library on java.net, and although it is several years old now, it seems to work well, and the author certainly put a lot of time and thought into it.
- I don't know how many people need a Java license key generator, but if you're in the market for one, and 'free' (or donation-ware) is your right price, I recommend taking a look at the TrueLicense license key generator for Java applications. Using True License as a Java license key manager - Update.
- Java Code To Generate Unique Key Code
- Java Code To Generate Unique Key Switch
- Java Generate Qr Code
- Java Code To Generate Unique Key Chain
- Details
- Written by Nam Ha Minh
- Last Updated on 04 July 2019 | Print Email
Jun 10, 2006 At the first glance it seems to be satisfied Unique key as its using current time and hashing to generate key but GetHashCode doesn’t procduce unique code everytime. Althought Microsoft is using Double Hashing algorithms with N Number of collision resolving double hash function but during my experimentation I found lot of collisions. Generate zwave network key random. Using java.util.UUID UUID class generates universally unique 32 character identifier (128-bit value) that can be a good candidate for keys and ids. But the UUIDs are rarely useful for generating secrets. To generate UUID, all we have to do is.
Java Cryptography - Creating a MAC - MAC (Message Authentication Code) algorithm is a symmetric key cryptographic technique to provide message authentication. For establishing MAC process, the send. Generate key using generateKey method of the KeyGenerator class as shown below. Generate mac for key and value java. I'm looking at implementing an app getting Twitter authorization via Oauth in Java. The first step is getting a request token.Here is a Python example for app engine. To test my code, I am running Python and checking output with Java. Here is an example of Python generating a Hash-Based Message Authentication Code (HMAC). About MAC Address Generator. The MAC Address Generator is used to generate a random MAC address, in lower or upper case for your convenience. The tool can generate four most commonly used types of MAC address formats and it is also allowed to specify your preferred MAC address prefix (specific OUI – Organizationally Unique Identifier). Processes the given array of bytes and finishes the MAC operation. A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal.
In this Java tutorial, you will learn how to generate random numbers using the random() method of the Mathclass and methods of the java.util.Random class.Remember that the generated numbers are actually pseudorandom numbers, or “fake” random numbers. The generated numbers are parts of a very large sequence so they appear to be random, but they are not true random numbers. However, you can use it for cases in which true randomness and security are not required.1. Generate random numbers using Math.random()
The static method random() of the Math class returns a pseudorandom double value in the range from 0.0 to 1.0. The following code generates a random integer number between 1 and 10 (1 <= x <= 10):And the following code snippet generates 10 random integer numbers between 1 and 10:This code creates an array of 100 random numbers in the range from 1 to 10:Similarly, the following code generates 10 random numbers between 1 and 100:And the following example generates random numbers in the range from 60 to 180:NOTE: The Math.random() method uses the java.util.Random class internally. It calls the nextDouble() method of the Random class that returns a pseudorandom double value between 0.0 and 1.0.
2. Generate random numbers using java.util.Random class
Randomis the base class that provides convenient methods for generating pseudorandom numbers in various formats like integer, double, long, float, boolean and you can even generate an array of random bytes. It is implemented under the java.util package so you need to import this class from this package in your code.You can create a new instance of the Random class by using its empty constructor:or by providing a long seed - the initial value of the internal state of the pseudorandom number generator. For example:A random number generator produces pseudorandom numbers in a determinable sequence or pattern, and the seed value specifies the starting point in the sequence, so two Random instances constructed with the same seed will produce the same sequence of pseudorandom numbers.Therefore, you can use the empty constructor in most cases. Use the seed parameter constructor when debugging the code with the same sequence of pseudorandom numbers.The nextBoolean() method returns the next random boolean value, for example:The nextBytes(byte[] bytes)method generates random bytes and put them into the specified byte array, for example:The nextDouble() method returns the next random double value between 0.0 and 1.0. This method is used by the Math.random() method. For example, the code to generate 10 random numbers between 1 and 10 using Random class can be written as follows:The nextFloat() method returns the next random float value between 0.0 and 1.The nextInt() method returns the next random integer value with 2^32 possible int values.The nextInt(int bound) method returns the next random integer value in the range from 0 (inclusive) to the specified bound value (exclusive). So the code to generate 10 random numbers between 1 and 100 can be written using nextInt() method as follows:And the nextLong() method returns the next random long value.
3. Using Java Stream API for random numbers
From Java 8, the Random class provides some methods that return streams of random numbers. For example:This returns a stream of random int values. The number of values is unlimited.The ints(long streamSize) method returns a limited stream of random int values. The number of values is specified by the streamSize. For example, the following code prints 10 random integer numbers:The ints(long streamSize, int randomNumberOrigin, int randomNumberBound)method returns a limited stream of random int values between randomNumberOrigin (inclusive) and randomNumberBound Java Code To Generate Unique Key Code
(exclusive). For example, the code to print 10 random integer numbers between 1 and 10 can be written as compactly as:The Random class also provides similar methods for producing a stream of random long values.Now, you can see there are at least 3 different ways to generate random numbers between 1 and 100 in Java.Using Math.random() method:Using nextInt() method of Random class:And using ints() method of Random class:References:
Other Java Coding Tutorials:
About the Author:
Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook.Ranch Hand
posted 14 years agoHi,
I have a set of numbers(may be 200- 300 numbers) and i need to generate a 8-10 digit/string key. I need this key to compare another key if that key is also made up of the same set of numbers. Is there a ways to generate a smaller key and also can be compared.
Thx in advance and its urgent
[ July 12, 2005: Message edited by: Mary Cole ]
I have a set of numbers(may be 200- 300 numbers) and i need to generate a 8-10 digit/string key. I need this key to compare another key if that key is also made up of the same set of numbers. Is there a ways to generate a smaller key and also can be compared.
Thx in advance and its urgent
[ July 12, 2005: Message edited by: Mary Cole ]
Bartender
posted 14 years agoHow's about giving us a little more information, like what the nature of the original numbers is and what the purpose of the unique key is. I'm sitting here picturing a set of numbers from 1-200 or 300 and wondering why you need to generate another key to individually identify each one.
Ranch Hand
posted 14 years agoWhat you're looking for is a cryptographic hashing function. There are generally two mainstream flavors: MD5 and SHA1.
http://java.sun.com/j2se/1.4.2/docs/api/java/security/MessageDigest.html
http://java.sun.com/developer/technicalArticles/Security/Crypto/
Hashing functions are used to produce a unique key for some input. If the input changes in any way, then the hash produced will be completely different, however if the same input is supplied you will consistently be getting the same hash.
In UNIX, for example, passwords are not stored in cleartext. Instead, the passwords are hashed and the hash is stored. This way if a hacker gets his hands on the hash he/she has no way of getting back the password. This is a property of a one-way hash function - you can only go one way (from password to hash, and not from hash to password). When a user supplies his/her password again to login into the system, the password is hashed once again and compared to what is stored on file. If the hashes match, then you login.
Here I wrote a quick example for you:
[ July 12, 2005: Message edited by: Yevgeniy Treyvus ]
[ July 12, 2005: Message edited by: Yevgeniy Treyvus ]
[ July 12, 2005: Message edited by: Yevgeniy Treyvus ]
http://java.sun.com/j2se/1.4.2/docs/api/java/security/MessageDigest.html
http://java.sun.com/developer/technicalArticles/Security/Crypto/
Hashing functions are used to produce a unique key for some input. If the input changes in any way, then the hash produced will be completely different, however if the same input is supplied you will consistently be getting the same hash.
In UNIX, for example, passwords are not stored in cleartext. Instead, the passwords are hashed and the hash is stored. This way if a hacker gets his hands on the hash he/she has no way of getting back the password. This is a property of a one-way hash function - you can only go one way (from password to hash, and not from hash to password). When a user supplies his/her password again to login into the system, the password is hashed once again and compared to what is stored on file. If the hashes match, then you login.
Here I wrote a quick example for you:
[ July 12, 2005: Message edited by: Yevgeniy Treyvus ]
[ July 12, 2005: Message edited by: Yevgeniy Treyvus ]
[ July 12, 2005: Message edited by: Yevgeniy Treyvus ]
Ranch Hand
Java Code To Generate Unique Key Switch
posted 14 years agoJoe,
Basically what am doing is generating a token based on the user selection of the values in the fields in GUI. 3 scenarios can exist for these selections --
AN user can select multiple products (am storing only productids.which is numeric.and 4-5 digts in length..)
AN user can select multiple vendors(am storing only vendorids.which is numeric. usially 2-3 digits in lenght)
AN user can select both multiple products and vendors( which is again numberic values productid and vendorid)..
So I have an array whcih contains these numbers. I sort this array and build a plain string by looping thru the array...so the length of the string might be 200+ characters if more selections are made.
Based on this I decide whehter the key already exists in my cache so that I can avoid the trip to DB for doing some calculations.
If another user also selects the same productid, vendorid and productid+vendorid combination i should get the same key so that I can use the cached data without hitting the DB
lets say userA has selected --
productID = 2456
vendorID = 34
productid,vendorid = 2834 , 18
So my token will be 183424562834 (after sorting and looping the array)
If the userB selects the same combination.. his token will also be the same
Suppose an userC has following combination--
productID= 1834, 2456,2834 ( he has selected multiple products)
VendorId NONE selected
ProductId,vendorId = NONE selected
Now also the generated toke will be 183424562834.
So my cache result will always be wrong.
Is there any good token generation process so that i can handle all these conditions.
Thx in advance
U
Basically what am doing is generating a token based on the user selection of the values in the fields in GUI. 3 scenarios can exist for these selections --
AN user can select multiple products (am storing only productids.which is numeric.and 4-5 digts in length..)
AN user can select multiple vendors(am storing only vendorids.which is numeric. usially 2-3 digits in lenght)
AN user can select both multiple products and vendors( which is again numberic values productid and vendorid)..
So I have an array whcih contains these numbers. I sort this array and build a plain string by looping thru the array...so the length of the string might be 200+ characters if more selections are made.
Based on this I decide whehter the key already exists in my cache so that I can avoid the trip to DB for doing some calculations.
If another user also selects the same productid, vendorid and productid+vendorid combination i should get the same key so that I can use the cached data without hitting the DB
lets say userA has selected --
productID = 2456
vendorID = 34
productid,vendorid = 2834 , 18
So my token will be 183424562834 (after sorting and looping the array)
If the userB selects the same combination.. his token will also be the same
Suppose an userC has following combination--
productID= 1834, 2456,2834 ( he has selected multiple products)
VendorId NONE selected
ProductId,vendorId = NONE selected
Now also the generated toke will be 183424562834.
So my cache result will always be wrong.
Is there any good token generation process so that i can handle all these conditions.
Thx in advance
U
Bartender
posted 14 years agoI'm still confused. Is there a correlation between product and vendor? If there is, then there should be some correlation between their keys. That is, you can select a product id, a vendor id or some valid combination of vendor and product id's.
You probably want to have some sort of formatted field where you can specify a key for a vendor without product (i.e. xxxx-34), a product without vendor (i.e. 1234-xx) and a vendor-product combo (i.e. 1234-34).
You probably want to have some sort of formatted field where you can specify a key for a vendor without product (i.e. xxxx-34), a product without vendor (i.e. 1234-xx) and a vendor-product combo (i.e. 1234-34).
Ranch Hand
posted 14 years agoJoe,
Its like this.. A product can stand on its own..a vendor can stand on its own..but there can be a combination of vendor-produt too..
So for independent product i have the key as '2345-PR'
For independent vendor i have '67-VE'
But for vend and prod combo i have it as '24-6677'
But when I want to build the key ..I will strip off all the characters so that I have plain numbers.
Hope am clear on this
Its like this.. A product can stand on its own..a vendor can stand on its own..but there can be a combination of vendor-produt too..
So for independent product i have the key as '2345-PR'
For independent vendor i have '67-VE'
But for vend and prod combo i have it as '24-6677'
But when I want to build the key ..I will strip off all the characters so that I have plain numbers.
Hope am clear on this
Bartender
posted 14 years agoOriginally posted by Mary Cole:
I will strip off all the characters so that I have plain numbers.
I will strip off all the characters so that I have plain numbers.
I think that's your problem. You need some context to your key so you aren't confusing product 1234 with vendor 12 and vendor 34.
Ranch Hand
posted 14 years agoIf idon't strip off and hold plain numbers..how will I compare the key..coz an UserA might have product 1234 at first position in the array nd user 2 might have the same product at 5th place in the array..so my comparision will not work ( even thought they have the same combos)
Bartender
posted 14 years agoI'd consider a query like the one below:
productID= 1834, 2456,2834 ( he has selected multiple products)
VendorId NONE selected
ProductId,vendorId = NONE selected
to be 3 seperate queries, one for each product.
Ranch Hand
posted 14 years ago
Even if i do like thats..is there a way to generate a shorter key 10 in lenght
Bartender
posted 14 years agoStill confused. I don't see any connection between the requirements you've specified so far and the need for a 10-digit key. Even if you wanted to take an entire query like this: Java Generate Qr Code
productID= 1834, 2456,2834 ( he has selected multiple products)
VendorId NONE selected
ProductId,vendorId = NONE selected
and shrink it down to 10 digits, you are losing information. You will have name collision, where two queries that are not equal will resolve to the same name and dropouts, where two queries that should be equal do not resolve to the same name.
If it were me, I'd cache each product id seperately, otherwise your cache will duplicate information (i.e. if you had another query productID= 1834, 2456, you don't want to store the results AGAIN, because they duplicate 2/3 of the previous query).
Java Code To Generate Unique Key Chain
Maybe you want to store all the query information in a class and override hashcode and equals to Do The Right Thing.
I get the feeling that this is a school assignment and since I don't have the objective for this lesson I'm missing the point of the exercise.