代码报错，求助

Question

package comm.imooc;import java.util.Scanner;public class testone { public static void main(String[] args) {  Scanner input = new Scanner(System.in);  int score = input.nextInt();  int count = 0;    System.out.println("累加前的成绩为："+score);  while(score<60){   score+=1;   count++;  }  System.out.println("累加后的成绩为："+score);  System.out.println("累加了"+count+"次");   }}点击运行就报：java.lang.NoClassDefFoundError: java/util/Scanner at comm.imooc.testone.main(testone.java:6)Exception in thread "main"

Answer 1

没有问题

Answer 2

代码没问题，是不是环境变量的问题