How to generate random numbers from 0-5 twice each. The numbers should be used twice only [closed]-CodePudding

How to generate random numbers from 0-5 twice only. For example the result should be like this 0,0,1,1,2,2,3,3,4,4,5,5 but it should be randomly. The numbers should be used twice only.

CodePudding user response：

This would be a solution:

ArrayList<Integer> numberList = new ArrayList<Integer>(); // Filling a dynamic list with our integers

numberList.add(0);
numberList.add(1);
numberList.add(2);
numberList.add(3);
numberList.add(4);
numberList.add(5);

Random rand = new Random();
while(numberList.size() > 0) // While we have a number inside our list
{
    int randomIndex = rand.nextInt(numberList.size()); // get a random index and display the number

    int randomNr = numberList.get(randomIndex);

    if(numberList.size() != 1)
    {
        System.out.print(randomNr   ", "   randomNr   ", ");
    }
    else // if we are at the last element, omit the last comma
    {
        System.out.print(randomNr   ", "   randomNr);
    }

    numberList.remove(randomIndex); // After displaying remove it.
}

CodePudding user response：

You can just generate one number and then copy it.

Example:

You are randomly generate 1, so you will output this number and copy of this number, then you will generate "second" number