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Program: How to change Random class seed value?


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. You can change the seed by calling setSeed() method. Each time you pass the same seed, you will get same random sequence. You can notice this with the below example.


Code:
package com.java2novice.random;

import java.util.Random;

public class MyRandomSeedChange {

	public static void main(String a[]){
		Random rnd = new Random(40);
		for(int i=0;i<5;i++){
			System.out.println(rnd.nextInt(100));
		}
		System.out.println("Changing seed to change to sequence");
		rnd.setSeed(45);
		for(int i=0;i<5;i++){
			System.out.println(rnd.nextInt(100));
		}
		System.out.println("Changing seed to change to sequence");
		rnd.setSeed(50);
		for(int i=0;i<5;i++){
			System.out.println(rnd.nextInt(100));
		}
		System.out.println("Setting seed 40 to produce the previous sequence");
		rnd.setSeed(40);
		for(int i=0;i<5;i++){
			System.out.println(rnd.nextInt(100));
		}
	}
}

Output:
82
39
37
63
96
Changing seed to change to sequence
9
31
31
40
87
Changing seed to change to sequence
17
88
93
12
51
Setting seed 40 to produce the previous sequence
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 abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{

}

Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();
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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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