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 is0.0 =< 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 l = new ArrayList(); //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
        

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