Aug 24, 2016  First we need to create object of java.util.Random class. After creating object of java.util.Random class then we need call nextInt method by passing range. Int range = maximum - minimum + 1; int randomNum = rn.nextInt(range) + minimum; package com.randomnumbergenerator; import java.util.Random. How to Generate Unique Random Numbers in Excel (No Duplicates) I was going through the questions on the Microsoft Excel Community, and one of the questions was on generating random numbers in Excel between 1 to 10, where none of the numbers repeat (i.e., there are no duplicates). There is a class called java.util.UUID, with a method to generate a random-based UUID. This 128-bit value has 122 of its bits generated randomly. UUID uuid = UUID.randomUUID; Call toString to view the value as a hex string in canonical format with hyphens inserted.

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Dec 18, 2018 This is a very common scenario in programming when there is a requirement to use some unique random id. This tutorial will help us to generate it in Java. In this post, we will see “how to create a unique random ID using the GUID algorithm?” Simplest example of generating a unique random id using GUID algorithm in Java.!!! Click To Tweet. Jun 09, 2017 Java - How to Generate Unique Serial Number in Database using Java. Random String Generator Java - Duration: 14:14. HOW TO GENERATE UNIQUE ID.

This class provides the functionality of a secret (symmetric) key generator.

Key generators are constructed using one of the getInstance class methods of this class.

KeyGenerator objects are reusable, i.e., after a key has been generated, the same KeyGenerator object can be re-used to generate further keys.

There are two ways to generate a key: in an algorithm-independent manner, and in an algorithm-specific manner. The only difference between the two is the initialization of the object:

• Algorithm-Independent Initialization

  All key generators share the concepts of a keysize and a source of randomness. There is an init method in this KeyGenerator class that takes these two universally shared types of arguments. There is also one that takes just a keysize argument, and uses the SecureRandom implementation of the highest-priority installed provider as the source of randomness (or a system-provided source of randomness if none of the installed providers supply a SecureRandom implementation), and one that takes just a source of randomness.

  Since no other parameters are specified when you call the above algorithm-independent init methods, it is up to the provider what to do about the algorithm-specific parameters (if any) to be associated with each of the keys.

• Algorithm-Specific Initialization

  For situations where a set of algorithm-specific parameters already exists, there are two init methods that have an AlgorithmParameterSpec argument. One also has a SecureRandom argument, while the other uses the SecureRandom implementation of the highest-priority installed provider as the source of randomness (or a system-provided source of randomness if none of the installed providers supply a SecureRandom implementation).

In case the client does not explicitly initialize the KeyGenerator (via a call to an init method), each provider must supply (and document) a default initialization.

Every implementation of the Java platform is required to support the following standard KeyGenerator algorithms with the keysizes in parentheses:

• AES (128)
• DES (56)
• DESede (168)
• HmacSHA1
• HmacSHA256

These algorithms are described in the KeyGenerator section of the Java Cryptography Architecture Standard Algorithm Name Documentation. Consult the release documentation for your implementation to see if any other algorithms are supported.posted 10 years ago

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posted 10 years ago

SCJP 1.4, SCWCD 1.4 - Hints for you, Certified Scrum Master
Did a rm -R / to find out that I lost my entire Linux installation!

posted 10 years agoThere is a contradiction in the term 'unique hash key'. Hash codes are not unique - a hashing algorithm will always have multiple possible inputs that result in the same hash code. (It's very easy to see theoretically why this is so - the hash code has fewer bits than the original data, so if there is a mapping from original data to hash keys, there must be some overlap). It's not possible to create unique IDs with a hashing algorithm.
MD5 and SHA1 are hashing algorithms, so they do not guarantee that you get a unique output for any input.
UUID is a universally unique identifier. It is not a hashing algorithm.

Jothi Shankar Kumar wrote:UUID hash = UUID.fromString(emailAddress);

This will not work and will most likely give you an IllegalArgumentException. You cannot put any arbitrary string into this method - it has to be a string that represents an UUID (as returned by UUID.toString()). It's not a method that generates a unique ID based on arbitrary input.
If you're looking for something that creates a unique ID based on arbitrary input - such a method can't exist in principle. (If you invent a method that does this, then you have discovered the ultimate compression algorithm and you'll win a Nobel prize in information theory.. See Jan Sloot).posted 10 years ago

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posted 10 years agoposted 10 years ago

Jothi Shankar Kumar wrote:So how could I acheive a unique key for my case here?

Hash and unique key are two different things, but to answer your question..
If you want to generate a key for a single application, then the UUID class should be fine. If it is a group of applications, meaning that you can be generating it from many applications and on many machines -- then you probably need to create your own class that uses the host, pid, and probably system time. Regardless, it is probably best to use a service (such as a database) to generate the id.
Henry

Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)

posted 10 years ago

Generate Unique Random Key In Java Word

Jesper Young wrote:Generate a unique ID, then store in a database somewhere which ID is associated with which user. When the user tries to activate the account using the ID, look the user's information up in the database.
You can create random unique IDs using the UUID class:
UUID id = UUID.randomUUID();
But, as I explained above, you cannot create unique identifiers based on some arbitrary input such as the user's e-mail address.

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I understand what you meant here. But how unique is the randomUUID() generator?

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Did a rm -R / to find out that I lost my entire Linux installation!

posted 10 years agoposted 10 years ago

SCJP 1.4, SCWCD 1.4 - Hints for you, Certified Scrum Master
Did a rm -R / to find out that I lost my entire Linux installation!

posted 10 years agoposted 10 years ago

SCJP 1.4, SCWCD 1.4 - Hints for you, Certified Scrum Master
Did a rm -R / to find out that I lost my entire Linux installation!

posted 10 years ago

Jothi Shankar Kumar wrote:I need to generate a unique hash key for all users that are registering on my application and send them a confirmation email link that will activate their account. I'm considering to use UUID for generating the unique id. I'm trying to generate it based on the users email address. I would like to know if that would be a correct approach??

No it's not. The best way is to keep a global counter (starting at 0). When a user registers he/she gets the counter number as id, and then you increment the counter by 1.

Generate Random Number In Java

In this way you're 100% sure each user gets a unique id. There is not other way to ensure that really.
Also, from a principle standpoint, the id's will be random. They're random in the sense that no user can know what number they're going to get.
posted 10 years ago

Ulrika Tingle wrote:

Jothi Shankar Kumar wrote:I need to generate a unique hash key for all users that are registering on my application and send them a confirmation email link that will activate their account. I'm considering to use UUID for generating the unique id. I'm trying to generate it based on the users email address. I would like to know if that would be a correct approach??

No it's not. The best way is to keep a global counter (starting at 0). When a user registers he/she gets the counter number as id, and then you increment the counter by 1.
In this way you're 100% sure each user gets a unique id. There is not other way to ensure that really.
But you have to synchronize the counter, or you will run into problems in a multi-threaded environment. AtomicLong can help out here to do the hard work, with its incrementAndGet() and getAndIncrement() methods, the synchronized versions of ++l and l++.

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posted 10 years ago

SCJP 1.4, SCWCD 1.4 - Hints for you, Certified Scrum Master
Did a rm -R / to find out that I lost my entire Linux installation!

How To Generate Unique Key In Java

posted 10 years ago

Generate Unique Random Key In Java Pdf