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Even better, maybe something like this: var numArray 0,1,2,3,4,5,6 numArray.

The resulting set of numbers will contain all of your indices without repetition. Repeat steps 1-2 until the array is empty.

Remove the chosen element from the array. And during the loop for the 22 girls, Im trying to grab a random number and then remove it from the ArrayList: double shirt Math.floor(Math.random() shirtnums.size()) shirtnum (int) shirt shirtnums. Math.random() returns a random number between 0.0 (inclusive), and 1. The Java Math class has many methods that allows you to perform mathematical tasks on numbers. The methods below are very simple to implement. Pick a random number < the size of the array. Java Switch Java While Loop Java For Loop. There is no need to wrap your array into a collection just to sort it. Math.random () can not return -0.000001 that would be round to 0 and 1.0000001 can not be returned that should round to 1. You should only use Collections.shuffle if you are dealing with a collection. Using Math.random () can return 1, this means Math.random ()100 can return 100, but OP asked for maximum 99 Using nextInt (100) is exclusive 100, it can only return values from 0 to 99.

Sample Durations List Shuffle: 43133nsīelow, are three different implementations of a shuffle. A list is a bit different than an array when it comes to shuffling.Īs you can see below, an array is faster than a list, and a primitive array is faster than an object array.