View Compilation Error

0_0_34387967_7772\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_34387967_7772\Main.java:3: 错误: 需要class, interface或enum
       while(in.hasNext()) {
       ^
0_0_34387967_7772\Main.java:5: 错误: 需要class, interface或enum
           if (a <= 100) {
           ^
0_0_34387967_7772\Main.java:8: 错误: 需要class, interface或enum
               } else if (a < 90 && a >= 80) {
               ^
0_0_34387967_7772\Main.java:10: 错误: 需要class, interface或enum
               } else if (a < 80 && a >= 70) {
               ^
0_0_34387967_7772\Main.java:12: 错误: 需要class, interface或enum
               } else if (a < 70 && a >= 60) {
               ^
0_0_34387967_7772\Main.java:14: 错误: 需要class, interface或enum
               } else {
               ^
0_0_34387967_7772\Main.java:16: 错误: 需要class, interface或enum
               }
               ^
0_0_34387967_7772\Main.java:20: 错误: 需要class, interface或enum
           }
           ^
9 个错误