随机选餐

public class Test02 {
    public static void main(String[] args) {
        String[] launchList ={
                "米线","盖饭","面","麻辣烫","饺子","汉堡"
        };
        //[0.0-1.0]
        int r=(int) (Math.random()*(launchList.length));
        System.out.println(r);
        System.out.println(launchList[r]);
    }
}