1. Java Generate Keys Based On Set Of Numbers 2017
2. Java Generate Keys Based On Set Of Numbers Pdf
3. Java Generate Keys Based On Set Of Numbers 1
4. Java Generate Keys Based On Set Of Numbers Worksheet

• To generate this number, we use RANDBETWEEN, a function that returns a random integer based on a lower and upper bound. Since we are only working with 4 values in CHOOSE, we supply 1 for the bottom number and 4 for the top number. When this formula is copied down, it will return one of the four numbers.
• Nov 27, 2017  The following one-liner Java 8 version will generate 1, 2,3. The first arg of iterate is the first nr in the sequence, and the first arg of limit is the last number. List numbers = Stream.iterate(1, n - n + 1).limit(10).collect(Collectors.toList).
• Java Program for Sum the digits of a given number Extract all integers from the given string in Java Introduction to Project Lombok in Java and How to get started?

In this section, we will discuss some of the important points about Java Set: Java Set interface is a member of the Java Collections Framework.; Unlike List, Set DOES NOT allow you to add duplicate elements.; Set allows you to add at most one null element only.

posted 11 years agoposted 11 years agoposted 11 years agoposted 11 years ago

Java Generate Keys Based On Set Of Numbers 2017

posted 11 years ago

Campbell wrote:Try putting the numbers into a Set<Integer>; then duplicates will be eliminated quietly and you can use the return value from the add() method to verify insertion.

Yes, but note that he's already trying to use a Hashtable for this, and getting an OutOfMemoryError. A HashSet just uses aHashMap internally, which is pretty much equivalent to Hashtable in most respects, including memory usage. So while using a Hashtable here is less semantically clear, I think the real problem here is the memory usage. Which brings us to:

Campbell Ritchie wrote:You can alter the heap size with the Xmx and Xms options, which you can find here.

Shree, this is an important point, and I don't see any response from you. Did you try increasing the maximum memory using -Xmx? That may well be the easiest solution to your problem, if your machine has enough RAM.
A question: is there a requirement about the range of the random numbers? In the code above, you're using nextInt(30000000), generating values from 0 to 29999999. In your later thread, you use nextLong(), generating values from -2^63 to 2^63 - 1. So, is there a specific requirement about the range, or are you just trying different things? Because if you can choose a smaller range, it's possible to solve this problem very efficiently using a BitSet or similar data structure to keep track of which numbers have previously been selected. That works if your range is something like 0 to 2 billion, or maybe 4 billion (with a little work). If you need a bigger range, well I suppose you could use a file-backed stand in for a BitSet, but that would be a lot slower. And if you need to cover the full range of a long, 2^64 different values, then it's very unlikely you have enough file space. Still, for a 'small' range like 2-4 billion or less, this could work quite well.

Campbell wrote:You cannot get truly random numbers unless you do something like seeding a detector with radioactive substances

Java Generate Keys Based On Set Of Numbers Pdf

Which would of course be incompatible with the stated requirement that he use a seed, in order to be able to reproduce resuults. I think we can take it as a given that for this conversation, 'random' should be interpreted as 'pseudorandom'.posted 11 years ago

If a code signer does not yet have a suitable private key for signing the code, the key must first be generated, along with a corresponding public key that can be used by the code receiver's runtime system to verify the signature.

Since this lesson assumes that you don't yet have such keys, you are going to create a keystore named examplestore and create an entry with a newly generated public/private key pair (with the public key in a certificate).

Type the following command in your command window to create a keystore named examplestore and to generate keys:

You will be prompted to enter passwords for the key and keystore.

Subparts of the keytool Command

Let's look at what each of the keytool subparts mean.

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• The command for generating keys is -genkey.
• The -alias signFiles subpart indicates the alias to be used in the future to refer to the keystore entry containing the keys that will be generated.
• The -keystore examplestore subpart indicates the name (and optionally path) of the keystore you are creating or already using.
• The storepass value that you are promted for specifies the keystore password.
• The keypass value that you are prompted for specifies a password for the private key about to be generated. You will always need this password in order to access the keystore entry containing that key. The entry doesn't have to have its own password. When you are prompted for the key password, you are given the option of letting it be the same as the keystore password.

Note: For security reasons you should not set your key or keystore passwords on the command line, because they can be intercepted more easily that way.

Distinguished-Name Information

If you use the preceding keystore command, you will be prompted for your distinguished-name information. Following are the prompts; the bold indicates what you should type.

Command Results

The keytool command creates the keystore named examplestore (if it doesn't already exist) in the same directory in which the command is executed. The command generates a public/private key pair for the entity whose distinguished name has a common name of Susan Jones and the organizational unit of Purchasing.

The command creates a self-signed certificate that includes the public key and the distinguished-name information. (The distinguished name you supply will be used as the 'subject' field in the certificate.) This certificate will be valid for 90 days, the default validity period if you don't specify a -validity option. The certificate is associated with the private key in a keystore entry referred to by the alias signFiles.

Java Generate Keys Based On Set Of Numbers 1

Self-signed certificates are useful for developing and testing an application. However, users are warned that the application is signed with an untrusted certificate and asked if they want to run the application. To provide users with more confidence to run your application, use a certificate issued by a recognized certificate authority.

Java Generate Keys Based On Set Of Numbers Worksheet

Note: The command could be shorter if option defaults are accepted or you wish to be prompted for various values. Whenever you execute a keytool command, defaults are used for unspecified options that have default values, and you are prompted for any required values. For the genkey command, options with default values include alias (whose default is mykey), validity (90 days), and keystore (the file named .keystore in your home directory). Required values include dname, storepass, and keypass.