How to generate random numbers?

Question

How do I write a program in java to generate random numbers between 1 and 2 ? Do I need to use for-loop or math.random ?? Is there any calculations that needs to be done before writing the code ?

possible duplicate of [Generating random integers in a range with Java](http://stackoverflow.com/questions/363681/generating-random-integers-in-a-range-with-java) — Jordi Castilla, Nov 19 '14 at 10:25
Check this link ( Generate Random Number using java) http://stackoverflow.com/questions/363681/generating-random-integers-in-a-range-with-java... you can also check http://java.about.com/od/javautil/a/randomnumbers.htm — MAK, Nov 19 '14 at 10:28

score 1 · Answer 1 · edited May 23 '17 at 12:02

1

You might want to take a look at java.util.Random, which does much of the work for you, especially the method nextFloat. Since this returns floats between 0.0 and 1.0, just add 1 to the result to get floats between 1.0 and 2.0

You might also want to take a look at this question, which asks the same thing, just with a different range.

edited May 23 '17 at 12:02

Community

1
1

answered Nov 19 '14 at 10:29

Alexander Weinert

665
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12

score 0 · Answer 2 · answered Nov 19 '14 at 10:27

import java.util.Random;

/** Generate 10 random integers in the range 0..99. */
public final class RandomInteger {

  public static final void main(String... aArgs){
    log("Generating 10 random integers in range 0..99.");

    //note a single Random object is reused here
    Random randomGenerator = new Random();
    for (int idx = 1; idx <= 10; ++idx){
      int randomInt = randomGenerator.nextInt(100);
      log("Generated : " + randomInt);
    }

    log("Done.");
  }

  private static void log(String aMessage){
    System.out.println(aMessage);
  }
}

How to generate random numbers?

2 Answers2