Using the random class

For this method, i have to randomly generate a new job with random priority and execution time. The chances of creating a new job is equal to PERCENT_NEW_JOB which is 6. Im not sure on how to create a new job with a random chance of actually creating. heres the code

/*Randomly generates a new job with random priority and execution time.
* The chances of creating a new job is equal to PERCENT_NEW_JOB.
* after the creation the job is placed in the waitingJobs queue.
*/
public static void generateJobs(int clock)
{
int randomPriority = Math.abs(generator.nextInt()) % 4 + 1;
int randomExecutionTime = Math.abs(generator.nextInt()) % 10 + 1;

Job job = new Job(randomPriority, randomExecutionTime, clock);
waitingJobs.offer(job);
}

first of all its a good idea to use code tags when posting code
here is how Java Forums - BB Code List
so it now looks like this

Code:

---

/*
        * Randomly generates a new job with random priority and execution time. The
        * chances of creating a new job is equal to PERCENT_NEW_JOB. after the
        * creation the job is placed in the waitingJobs queue.
        */
        public static void generateJobs(int clock) {
                int randomPriority = Math.abs(generator.nextInt()) % 4 + 1;
                int randomExecutionTime = Math.abs(generator.nextInt()) % 10 + 1;

                Job job = new Job(randomPriority, randomExecutionTime, clock);
                waitingJobs.offer(job);
        }

---

but perhaps your question isnt phrased properly

it looks to my newbie eyes like you have sucessfully created a new Job

when you say

Quote:

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Im not sure on how to create a new job with a random chance of actually creating.

---

do you mean that you want to randomly create the Job (sometimes you will sometimes you wont ) that has just been randomly initialized
orare you just trying to randomly create the variables that make up the Job..

sorry if this doesnt make much sense but im also a noob,
it helps to be clear with your questions How To Ask Questions The Smart Way


Kind regards
Sonny

yea i want to randomly create the job as in sometimes it will work and sometimes it wont

okay but i am guessing a bit here
i am assuming that that you already have something like this in your class

Code:

---

private RandomGenerator generator = new RandomGenerator();

---

already

if that is the case you can use the next boolean method

something like

Code:

---

if(generator.nextBoolean(double p){
                        Job job = new Job(randomPriority, randomExecutionTime, clock);
                        waitingJobs.offer(job);
                }

---

double p represents the probability,
so for example if you wanted a 65% percent probability you would use

Code:

---

if(generator.nextBoolean(0.65){
                        Job job = new Job(randomPriority, randomExecutionTime, clock);
                        waitingJobs.offer(job);
                }

---

take a look at The acm.util.RandomGenerator Class for details on random generator class

and best of luck hope this helps

Sonny

thanks alot sonny, i was looking up the random class but just couldnt figure it out, thanks again

RandomGenerator is not part of the standard Java library. Are you sure that you're supposed to be using this class? Myself, I'd use the standard Random class, call nextDouble() which gives a double between 0 and 1, and use an if (myRandomDouble > 0.65)... e.g.

Code:

---

Random random = new Random();

double myRandomDouble = random.nextDouble();
if (myRandomDouble > 0.65) {
  //.... do something
}

---

etc...

if you have this declared in your class

Code:

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private final double PERCENT_NEW_JOB = 0.06;

---

0.06 is 6%

i think you should be able to do this

Code:

---

if(generator.nextBoolean(PERCENT_NEW_JOB){
                        Job job = new Job(randomPriority, randomExecutionTime, clock);
                        waitingJobs.offer(job);
                }

---

which would be much better. but dont trust me play with it, and post any problems,, OR mark this thread solved if you have sorted out the problem
knid regards
Sonny