Question

I have a xml file having 50 different questions and i need only 15 out of them randomly and non-repeated.I used the code below

int n = ((int)(Math.random()*100))%50;
if(temp<15)
{
    for(int i=0;i<temp;i++)
    {
        System.out.println("hello naresh");
        if(n==check[i])
        {
            n=((int)(Math.random()*100))%50;
        }
    }
    check[temp]=n;
}

temp++;
return n;

But by using this some questions are repeated.Please suggest me something which help me to generate the non-repeated questions.

Answer 1

By this way u can generate any no of random no.

     int max=50;
        List<Integer> indices;
    int randomIndex = 0;
random(){
    int arrIndex = (int)((double)indices.size() * Math.random());
           System.out.println("my random no is:"+arrIndex);
           randomIndex = indices.get(arrIndex);
           indices.remove(arrIndex);
            return randomIndex;
}