Solved Getting a random number

Discussion in 'Plugin Development' started by Forword, Apr 23, 2018.

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  1. Offline

    Forword

    How would you get 2 random numbers that both add up to 100?

    I currently have:

    [/code]
    public static int getRandom(int lower, int upper)
    {
    Random random = new Random();
    return random.nextInt(upper - lower + 1) + lower;
    }
    [/code]

    But that doesn't really work with what I'm trying to get.
     
  2. Offline

    JanTuck

    Do you want two numbers or just 1?


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  3. Offline

    Forword

    2 numbers
     
  4. Offline

    JanTuck

    So if the random number was 19, the other number would be 81?


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  5. Offline

    Forword

  6. Offline

    Zombie_Striker

    @Forword
    int upper = Math.random*100;

    int lower = 100-upper;
     
    JanTuck likes this.
  7. Offline

    Forword

    Ok lemme test that @Zombie_Striker

    @Zombie_Striker
    Where would you like me to put that beacause its saying:
    random cannot be resolved or is not a field

    EDIT by Moderator: merged posts, please use the edit button instead of double posting.
     
  8. @Forword
    Here is your code:

    Code:
        public static int[] getNumbers(int lower, int upper)
        {
            Random random = new Random();
            int num_1 = random.nextInt(upper - lower + 1) + lower;
            return new int[] {num_1, upper-num_1};
        }
    for instance: If you type
    Code:
    int[] result = getNumbers(0, 100);
    and the num_1 will set to 39, then the num_2 will be (upper-39) = (100-39) = 61
    as result. result[0] = 39 and result[1] = 61.

    //DISCLAIMER// This is an elaborated code of @Zombie_Striker's example.

    I hope this helps you out.
     
    Last edited: Apr 23, 2018
  9. Offline

    Forword

    Thank you very much, that is what I wanted :D

    @DanielTheDev
    EDIT: If I were to use that in 2 lines what would I have to do?

    lore1.add(ChatColor.GREEN + "Success Rate: " + getRandom(1, 50) + ChatColor.GREEN + "%");
    lore1.add(ChatColor.RED + "Destroy Rate: " + getRandom(1, 50) + ChatColor.RED + "%");

    Each line will have a number and
    the numbers have to equal 100 :/

    EDIT by Moderator: merged posts, please use the edit button instead of double posting.
     
    Last edited by a moderator: Apr 23, 2018
  10. @Forword

    I think you mistunderstood my code.
    The method will create 2 numbers (array).

    This will be the right code for you.
    Code:
    int[] result = getRandom(1, 50);
    
    lore1.add(ChatColor.GREEN + "Success Rate: " + result[0] + ChatColor.GREEN + "%");
    lore1.add(ChatColor.RED + "Destroy Rate: " + result[1] + ChatColor.RED + "%");
    I think this solves your problem :)
     
  11. Offline

    JanTuck

    Random instances are quite wasteful please use ThreadLocalRandom to get over this.

    This function will do the same exact thing.
    Code:
        public static int[] getNumbers(int lower, int upper) {
            int[] returnVal = new int[2];
            returnVal[0] = ThreadLocalRandom.current().nextInt(lower, upper);
            returnVal[1] = upper - returnVal[0];
            return returnVal;
        }
     
  12. Offline

    Forword

    @JanTuck
    For your code, how would it work?

    EDIT: Like when your using it in a message, how would it work?
     
  13. Offline

    JanTuck

    The same way his code worked.

    Code:
    int[] chances = getNumbers(1, 50);
    lore1.add(ChatColor.GREEN + "Success Rate: " + chances[0] + ChatColor.GREEN + "%");
    lore1.add(ChatColor.RED + "Destroy Rate: " + chances[1] + ChatColor.RED + "%");
     
  14. Offline

    Forword

    Alright thanks, Ill test it out in a bit

    @JanTuck, the numbers it gave me were always 57 and 43

    Heres my code:

    Code:
    public static int[] getNumbers(int lower, int upper) {
            int[] returnVal = new int[2];
            returnVal[0] = ThreadLocalRandom.current().nextInt(lower, upper);
            returnVal[1] = upper - returnVal[0];
            return returnVal;
        }
            int[] chances = getNumbers(1, 50);
    
    lore.add(ChatColor.GREEN + "Success Rate: " + chances[0] + ChatColor.GREEN + "%");
    lore.add(ChatColor.RED + "Destroy Rate: " + chances[1] + ChatColor.RED + "%");
    
    EDIT by Moderator: merged posts, please use the edit button instead of double posting.
     
    Last edited by a moderator: Apr 23, 2018
  15. Offline

    JanTuck

    It can’t be unless you made the upper 100


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  16. Online

    timtower Administrator Moderator

    @Forword code blocks are [code] <code here> [/code]
    Not [/code] <code here> [/code]
     
  17. Offline

    Forword

    @JanTuck
    When I make the upper 100, it still is 57, 43

    EDIT: I need those numbers to be random everytime
    To elaborate more on that, whenever I try to get 2 different numbers,
    they always turned out be to 57 and 43
     
    Last edited: Apr 23, 2018
  18. Offline

    JanTuck

    Then get another pair of random numbers each time and update the lore
     
  19. Offline

    Forword

    @JanTuck
    Is there an efficient way to constantly get 2 different numbers which add up to 100?
    Ex.
    50, 50 | 25,75
    Those numbers will constantly be changing. The code which you has provided me with, only get a combination of 2 of the exact same numbers each time. I'm trying to use this for a success and destroy rate for a custom enchantment plugin.

    Thanks, Forword :D
     
  20. @Forword
    You could generate 1 number between 1 and 100 and then to get the second number do
    int secondNum = 100 - randNum;
     
  21. Offline

    Forword

    @Blackwing_Forged
    if you mind, can you make a piece of code for that?
    I’m only asking this because whenever I try doing it, it never works.
     
  22. @Forword
    Can you show me your current code
     
  23. Offline

    Forword

    Code:
    public static int getRandom() {
                Random random = new Random();
                int Failure = random.nextInt(1-100);
                int Success = 100 - Failure;
                return Success;
            }
    
    How do I get failure number?
     
  24. Code:
    public static int[] getRandom() {
                int Failure = ThreadLocalRandom.current().nextInt(1-100);
                int Success = 100 - Failure;
                return new int[] {Success, Failure};
      }
    
    int[] both = getRandom();
    int success = both[0];
    int failure= both[1];
    
     
  25. Offline

    Forword

    @DanielTheDev

    Code:
    package me.forword.server.commands;
    
    import org.bukkit.ChatColor;
    import org.bukkit.command.Command;
    import org.bukkit.command.CommandExecutor;
    import org.bukkit.command.CommandSender;
    
    import io.netty.util.internal.ThreadLocalRandom;
    
    public class Test implements CommandExecutor {
    
        public static int[] getRandom() {
            int Failure = ThreadLocalRandom.current().nextInt(1-100);
            int Success = 100 - Failure;
            return new int[] {Success, Failure};
        }
        int[] both = getRandom();
        int success = both[0];
        int failure= both[1];
    
        @Override
        public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
           
            sender.sendMessage(ChatColor.GREEN + "Success Rate:" + both[0]);
            sender.sendMessage(ChatColor.RED + "Failure Rate:" + both[1]);
            return true;
           
           
           
        }
    }
    
    Is there a reason why that wont work?
     
  26. Online

    timtower Administrator Moderator

    @Forword Use that code in the onCommand, not outside where it only gets called once.
     
  27. Offline

    JanTuck

    Why are you running NextInt on -99?
     
  28. Offline

    Forword

    @timtower
    it doesnt work when i put it inside the onCommand
     
  29. Offline

    JanTuck

    Because the method needs to be outside, the getter inside.
     
  30. Offline

    Forword

    @JanTuck
    can you think of another way to get 2 numbers that will always reach 100?
     
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