Using math.random to generate a certain amount of random numbers in java

Question

I need help making a program in java that lets you write a number in textField and then generate that amount of random numbers from 0-9 using i = (int) (Math.random() * 10.0). For example if I would write 5 in the textField the program would generate 5 random numbers from 0-9.

Thanks

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– blurfus, Commented Apr 10, 2016 at 18:33

Peter Walser · Accepted Answer · 2016-04-11 06:41:41Z

1

Using the new Java 8 streams API:

int n = Integer.parseInt(myTextField.getText());
int[] random = ThreadLocalRandom.current().ints(0, 10).limit(n).toArray();

uses the current thread local random (recommended over creating a new Random instance)
creates a random stream of integers in the range [0..10) -> 0..9
Stream terminates after n numbers have been generated
the stream result is collected and returned as an array

answered Apr 11, 2016 at 6:41

Peter Walser

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Comments

theVoid · Accepted Answer · 2016-04-11 06:25:24Z

0

Ok since you want to use the Math.random() method try the following:

    int times = 5;//how many numbers to output

    for(int i = 0; i < times; i++)
    {
        System.out.println((int)(Math.random()*10));
        //you must cast the output of Math.random() to int since it returns double values
    }

I multiplied by 10 because Math.random() returns a value greater than or equal to 0.0 and less than 1.0.

edited Apr 11, 2016 at 6:25

answered Apr 10, 2016 at 19:03

theVoid

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2 Comments

tucuxi Over a year ago

Change your loop to i < times -- you are now printing 6 numbers

theVoid Over a year ago

I just gave an example value to times i never said it will print five numbers. Anyway,i changed it to prevent future confusion thanks for pointing it out.

Debosmit Ray · Accepted Answer · 2016-04-10 22:58:18Z

0

int x = value entered in textfield;
int generatedRandomNumber = 0;
java.util.Random rand = new java.util.Random();
for(int i=0 ; i<x ; i++) {
    generatedRandomNumber=rand.nextInt(10);//here you have your random number, do whatever you want....
}

edited Apr 10, 2016 at 22:58

Debosmit Ray

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answered Apr 10, 2016 at 18:44

Ashish Sharma

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1 Comment

tucuxi Over a year ago

Fix your indentation - it will make your code easier to read. Also, don't make your lines longer than 80 columns - just put the comment on another line

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