import java.util.Random;
public class randomDemo {
public static void main(String[] args) {
randomTest();
}
public static void randomTest(){
//Random产生随机数
Random r=new Random();
for (int i=1;i<10;i++){
int num= r.nextInt(50)+1;
System.out.println(num);
}
System.out.println("---------");
//产生20到80之间的随机数
for (int i=1;i<=10;i++){
int num=r.nextInt(61)+20;
System.out.println(num);
}
}
}