java基礎——random小例子(生成22選5彩票)

//一個利用random生成22選5彩票的代碼示例
public class Lottery
{
       
    public static void main(String[] args)
    {
        int total = 22;
        int k = 5;
        int[] numbers = new int[total];
        for(int i=0;i<numbers.length;i++)
        {
           
            numbers[i] = i+1; 
        }
        int[] result = new int[k];
        int counter = 0;
        do
        {
            int r = (int)(Math.random()*22);
            if(numbers[r]==-1)
                      continue;
            result[counter]=numbers[r];
            numbers[r]=-1;
            counter++;
        }
        while(counter<5);
           
        for(int i : result)
                {
              System.out.print(i+" ");
        }
       
    }
}