# Random from set Values

Discussion in 'Plugin Development' started by ItZ_JameZ_, Apr 15, 2023.

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### ItZ_JameZ_

Hello all I'm trying to make a feature where a random value gets picked from a list of predetermined values that equal 100 kinda like this

Code:
```item1:
chance: 10
item2:
chance: 10
item3:
chance: 15
item4:
chance: 35
item5:
chance: 30```
I'm currently using just java.util.Random to generate a random number but where I need help is doing a percent chance of getting each entry.

EDIT: I have answered my own question I found this post on Stackoverflow and honestly its so simple. I'm embarrassed.

https://stackoverflow.com/questions/9330394/how-to-pick-an-item-by-its-probability
Code:
```Item A 25%
Item B 15%
Item C 35%
Item D 5%
Item E 20%

Lets pretend that all the probabilities are integers, and assign each item a "range" that calculated as follows.

Start - Sum of probability of all items before
End - Start + own probability

The new numbers are as follows

Item A 0 to 25
Item B 26 to 40
Item C 41 to 75
Item D 76 to 80
Item E 81 to 100

Now pick a random number from 0 to 100. Lets say that you pick 32. 32 falls in Item B's range.

mj```

Last edited: Apr 17, 2023
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