I've generally implemented sequence number generation using database sequences in the past. I have a String that looks like "Hello my is Joeseph.
It is very nice to meet you. What a wonderful day it is! I want to count the number of I want to generate a sequence number starting fromThanks in advance. I need to be able to generate a series of ascending or descending numbers within a range. I need a sequence of a Numbers to be generated through incrementing.
For Ex if it starts with goes till next no should be A01 again goes till I want to generate random numbers in java, I know I should use existing methods like Math. I have the following qn and I am in doubt how to get started. I have a few formulas but the problem is I am uncertain how to equate in Java. From the start program, I would provide a series of numbers and based on the numbers, I have to equate to see which best fits into the formula.
It has Hi All, Can anybody give me a code where I should have the output of missing numbers from a sequence. For example if I have a list then my output should beI know this's a homework assignment, but I would appreciate any help you could offer. Thanks for your help, Divya Hi All. My question is similar to generating ID number for each record in database; however, it is to generate a sequence number for every client request received over the web. I heard that there are 1. Are there code examples that I can follow?
Thank you. If it is single 1, it shouldnot be modified, if there are more that single Using something like an ArrayList may not be a bad idea, depending on how you implement this. For instance, I got bored the other day when this thread was fresh, and decided to code up my own KeithNumber search function.
I decided to use BigInteger so that it would be able to find Keith numbers of arbitrary size, and I think Hi, i have been trying to get a sequence code working. While i have a public method that differentiates between odd and even numbers i cannot seems to get the loop working.
When the method report that the given int is a even number it divides the number by 2. If the number is odd it multiplies the number by No, I cannot use a simple sequence of non-repeating values. Bad examples: 1, 2, 3, 4, Umm, references aren't meaningful outside of the JVM which created them.Enter a range of numbers like or a list of numbers to randomize like 10 20 30 40 You can also mix ranges and list like You can also add alphanumeric lists or words like a,b,c or apple, orange, banana. If you have a range with negative numbers, you can enter it using a ':' like To generate a non-repeating sequence, generate same amount of numbers as present in the range.
For pin codes, passwords, etc: Check "Order Matters" and uncheck "Unique". For no repeats: Check "Unique". For numbers with replacement: Uncheck "Unique". If numbers to be generated per line are more than the numbers available in the range, the random number generator will automatically switch to allow numbers with replacement i. Random Number Generator. Select All. Numbers per set or line. Your choice of numbers range or list Enter a range of numbers like or a list of numbers to randomize like 10 20 30 40 Select Uniqueness and Order Unique Numbers.
Order Matters. Unique Lines. Odd numbers only. Even numbers only. Equal odd and even.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The long has to be 4 digits. If you want to generate a number from range [0, ], you would use random. A Java int will never have leading 0 s. You'll need a String for that. You could use String. And Random. Learn more. Asked 4 years, 5 months ago. Active 4 years, 5 months ago. Viewed 36k times.
Louise Lin Louise Lin 1 1 gold badge 1 1 silver badge 7 7 bronze badges. Active Oldest Votes. Grogi Grogi 1, 11 11 silver badges 12 12 bronze badges. Elliott Frisch Elliott Frisch k 14 14 gold badges silver badges bronze badges.
The Overflow Blog. The Overflow How many jobs can be done at home? Featured on Meta. Community and Moderator guidelines for escalating issues via new response….
Feedback on Q2 Community Roadmap. Triage needs to be fixed urgently, and users need to be notified upon…. Dark Mode Beta - help us root out low-contrast and un-converted bits.Retired horse trader. Note: double-underline links may be advertisements automatically added by this site and are probably not endorsed by me.
I want a algorithm kind of thing which generates random unique number based on the digits of the input number. I found one solution. SCJP 1. There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors. Forum: Java in General. Hi, I am developing a application, which has some int manipulations. Thing is i am getting input values as, etc.
I need it very urgent. James Sabre. I like One possibility - create a map between the numbers and an int. Start the int values at 0 and increment each time you add a big number. Why not!
They are numbers and they are unique. There is obviously more to your requirement then you have said. Hunter McMillen. As long as you increment every time you add you will always have a unique id. Database' often use this scheme for IDs Hunter. Since you already have a database then why not just use a database table mapping the big integers to the small integers.
You can use auto-increment when inserting the big numbers. How can it be? You cannot make any simple manipulations of a big number that will create a unique int!
Rob Spoor. There is absolutely no way you can get an algorithm that guarantees uniqueness. Eventually you will get a duplicate. That said, the auto-increment from 0 or 1, as databases do is going to be as good as it gets, as long as you have proper synchronization.Comment 5.
While developing applications, we often need to generate random numbers. Java provides support for generating random numbers primarily through the java.
Math and java. Random classes. In this post, I will discuss different ways to generate random numbers based on different types of requirements. Java provides the Math class in the java. The Math class contains the static Math. The random method returns a double value with a positive sign, greater than or equal to 0.
When you call Math.
Program: How to generate same random number sequence everytime?
Random pseudorandom-number generator object is created and used. You can use the Math. If you provide parameters, the method produces random numbers within the given parameters. The code to use the Math.Java program to generate unique random number on each call
The getRandomNumber method uses the Math. For generating random numbers between a given a range, you need to specify the range. A standard expression for accomplishing this is:. There are different ways of implementing the above expression. Let us look at a couple of them. By default, the Math. The code to generate a random double value between a specified range is:. You can call the preceding method from the main method by passing the arguments like this.
The preceding getRandomIntegerBetweenRange method produces a random integer between the given range. As Math. You can call this method from the main method by passing the arguments as follows:. Note: You can pass a range of negative values to generate a random negative number within the range.
The dark mode beta is finally here.
Random Number Generation in Java
Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.
I want to generate 12 digit mobile number. It's start with Ex:, If you want to just get the nextNumber: I would suggest AtomicLong. If you need random numbers with possible duplicated, you can use the ThreadLocalRandom as suggested by Ravi. If you are looking for random number 12 digit number starting with 9 you can make use of ThreadLocalRandom. Learn more.
Random Number Generator
How to generate 12 digit sequence number in java Ask Question. Asked 3 years, 1 month ago. Active 3 years, 1 month ago. Viewed 4k times. It is possible in java? Sri Sri 2 2 gold badges 5 5 silver badges 18 18 bronze badges.
Mohammad Oghli: i have save method,in that i want to generate one 12 digit seq mobile number. Active Oldest Votes. It depends on what you want to do. Bojan Petkovic Bojan Petkovic 1, 9 9 silver badges 20 20 bronze badges.
It seems like you want to generate all numbers in sequence from to ? You could do something like this. Oscar Lundberg Oscar Lundberg 3 3 silver badges 13 13 bronze badges. Doesn't work because int cannot hold such large numbers. Limit issee Integer. ThomasFritsch I changed it to a long about 5 minutes ago, is it not visible?Some times we need to generate same random number sequence everytime we call the sequence generator method on every call.
We cannot achieve this if we use simple Random class constructor. We need to pass seed to the Random constructor to generate same random sequence. The below example, calls the generateSequence method three times, and generates the same random sequence.
I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners.
The source code is compiled and tested in my dev environment. We know that String is immutable object. We can not change the value of a String object once it is initiated. If we try to change the value of the existing String object then it creates new object rather than changing the value of the existing object.
So incase, we are going to do more modificatios on String, then use StringBuffer. StringBuffer updates the existing objects value, rather creating new object. About Author I'm Nataraja Gootooru, programmer by profession and passionate about technologies. Java Data Structures Java 8 new features Write a program to find common integers between two sorted arrays. Publish Your Article Here. Program: How to generate same random number sequence everytime? List of Random class sample programs: Basic random number generator.
How to generate random numbers in the given range?
How to generate same random sequence everytime? How to change Random class seed value? How to create random string with random characters? All Rights Reserved.