How do i restrict a Java random number generation -

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here deal: have java code generates random number between 2 numbers , works fine. i'm trying achieve something. want in such way after first number has been generated, when recalls it, doesn't generate same number. instance, if number 4 generated, want included among possible generated numbers second time. make things little bit clear, here's code.

      int maximum=10;       int minimum=1;       int r;       r = (int)(math.random() * maximum) + minimum;

is there can make code above not generate particular number between 1 , 10? thanks.

you fill collection , removed randomly selected number:

list<integer> nums = new arraylist<>(); (int = /* start */; < /* end */; i++) {     nums.add(i); }  //elsewhere random rand = new random(); int = nums.remove(rand.nextint(/* end */); /* end */--;

this may bit slower large amounts of numbers end result lower time-complexity on checks new numbers (whereas while loop in theory o(∞n) if i'm not mistaken)

alternatively, use collections#shuffle


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