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Program: How to generate same random number sequence everytime?


Description:

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.


Code:
package com.java2novice.random;

import java.util.Random;

public class MySameSequenceWithRange {

	public void generateSequence(){
		Random rnd = new Random(40);
		for(int i=0;i<5;i++){
			System.out.println(rnd.nextInt(100));
		}
	}
	
	public static void main(String a[]){
		MySameSequenceWithRange mss = new MySameSequenceWithRange();
		mss.generateSequence();
		System.out.println("====================");
		mss.generateSequence();
		System.out.println("====================");
		mss.generateSequence();
	}
}

Output:
82
39
37
63
96
====================
82
39
37
63
96
====================
82
39
37
63
96
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List of Random class sample programs:

  1. Basic random number generator.
  2. How to generate random numbers in the given range?
  3. How to generate same random sequence everytime?
  4. How to change Random class seed value?
  5. How to create random string with random characters?
Knowledge Centre
What is wrapper class?
Everything in java is an object, except primitives. Primitives are int, short, long, boolean, etc. Since they are not objects, they cannot return as objects, and collection of objects. To support this, java provides wrapper classes to move primitives to objects. Some of the wrapper classes are Integer, Long, Boolean, etc.
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About Author

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.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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