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Thread: Printing many random names from an array

  1. #1
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    Post Printing many random names from an array

    In this code I create first a list with some names and then print them randomly:

    package testrandom;
     
     
    public class TestRandom {
     
     
    public static void main(String[] args) {
    String [] name={"Bob","Joe","Max","Alfred","Mat"};
    int min =0;
    int max= name.length;
    int random_int = (int)Math.floor(Math.random()*(max-min+1)+min);
    System.out.println(name[random_int]);
     
    }
     
    }

    This code prints only one name everytime I run it. Now if I want to have for exemple 3 random names from that list each time, how should I modify my code ?!

    I tried with this but failed:

    package testrandom;
     
     
    public class TestRandom {
     
     
    public static void main(String[] args) {
    String [] name={"Bob","Joe","Max","Alfred","Mat"};
    int min =0;
    int max= name.length;
     
    for (int i=0; i<4;i++)
    ///System.out.println("Random value in int from " +min+"to "+max+" : ");
    int random_int = (int)Math.floor(Math.random()*(max-min+1)+min);
    //System.out.println(random_int);
    System.out.println(name[random_int]);
     
    }
     
    }
    Last edited by pooyan89; May 1st, 2021 at 12:56 PM.

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Printing many random names from an array

    failed
    Please explain what that means. What happened when the code was compiled and executed?
    Why did it fail?

    Please edit your post and wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    pooyan89 (May 1st, 2021)

  4. #3
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    Default Re: Printing many random names from an array

    Quote Originally Posted by Norm View Post
    Please explain what that means. What happened when the code was compiled and executed?
    Why did it fail?

    Please edit your post and wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.
    Did it!

    My question is if I want a loop that each time I run the program it prints 3 names randomly from the list

  5. #4
    Super Moderator Norm's Avatar
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    Default Re: Printing many random names from an array

    What happened to the code's indentations? All the statements start in the first column. That makes the code harder to read and understand. For example it is hard to see what statements are inside of the for loop and what statements follow the loop.

    What happens when you compile and execute the code? Copy the output and paste it here. Add some comments to the output saying what is wrong with it.
    If you don't understand my answer, don't ignore it, ask a question.

  6. #5
    Super Moderator Norm's Avatar
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    Default Re: Printing many random names from an array

    Also posted here: https://coderanch.com/t/741926/java/...om-names-array
    If you don't understand my answer, don't ignore it, ask a question.

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