java - 关于随机数生成Random的使用

Question

为什么会报错,求大神教!!!(PS:想生成某个范围的随机数)
是不是Random对象初始化有错? 要怎么改才对啊?

Answer 1

Your randoms are all null, and you will definitely get an error... You need to create a new Random object and assign it to random:

Random random = new Random();
// 其他代码

Answer 2

Random random=new Random（）;

Answer 3

You must have obsessive-compulsive disorder when writing code! For example, seeing warnings makes you feel uncomfortable. . . .