Java randomly generates non-repeating numbers between 1 and 15

Function description:

random() method is used to return a random number, the range of random numbers is 0.0 =< Math .random < 1.0.

For example:

Generating an integer between 0 and 9 is:

(int)(Math.random()*10);

Generating an integer between 1 and 10 can be written as:

(int)(Math.random()*10 + 1);

And so on: to generate a number between 0~n, it should be written as:

Math.random()*n;

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The example is as follows:

package text;

import java.util.ArrayList;
import java.util.List;

public class Text {

    public static void main(String[] args) {
        //创建一个Integer集合的链表
        List<Integer> l = new ArrayList<Integer>();
        //当链表中存在15个数时结束向链表中插入数据
        while(l.size()<15){
          int i = (int)(Math.random()*15+1);
            if(!l.contains(i)) 
                l.add(i);
        }
        //迭代，输出链表中的元素
        //for(int j:l)
        //    System.out.println(j);
        for(int i=0;i<l.size();i++)
        {
            System.out.println(l.get(i));
        }
        
    }
}

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