View Compilation Error

0_0_26204732_7332\Main.java:1: 错误: 需要class, interface或enum
 public static BigInteger Factorialdec(int n)
               ^
0_0_26204732_7332\Main.java:4: 错误: 需要class, interface或enum
         for (int i = 1; i <= n; i++)
         ^
0_0_26204732_7332\Main.java:4: 错误: 需要class, interface或enum
         for (int i = 1; i <= n; i++)
                         ^
0_0_26204732_7332\Main.java:4: 错误: 需要class, interface或enum
         for (int i = 1; i <= n; i++)
                                 ^
0_0_26204732_7332\Main.java:8: 错误: 需要class, interface或enum
         }
         ^
0_0_26204732_7332\Main.java:11: 错误: 需要class, interface或enum
     }  
     ^
6 个错误