View Compilation Error

0_0_34664596_32440\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_34664596_32440\Main.java:4: 错误: 需要class, interface或enum
  while(in.hasNext()) {
  ^
0_0_34664596_32440\Main.java:6: 错误: 需要class, interface或enum
   System.out.printf("%.3f\n",4.0/3.0*r*r*r*3.1415927);
   ^
0_0_34664596_32440\Main.java:7: 错误: 需要class, interface或enum
  }
  ^
4 个错误