View Compilation Error

0_0_25776851_11409\Main.java:1: 错误: 需要class, interface或enum
 public static int Sum(int n){
               ^
0_0_25776851_11409\Main.java:3: 错误: 需要class, interface或enum
        for (int i=1;i<=n;i++){
        ^
0_0_25776851_11409\Main.java:3: 错误: 需要class, interface或enum
        for (int i=1;i<=n;i++){
                     ^
0_0_25776851_11409\Main.java:3: 错误: 需要class, interface或enum
        for (int i=1;i<=n;i++){
                          ^
0_0_25776851_11409\Main.java:5: 错误: 需要class, interface或enum
        }
        ^
0_0_25776851_11409\Main.java:7: 错误: 需要class, interface或enum
    }
    ^
0_0_25776851_11409\Main.java:8: 错误: 需要class, interface或enum
    public static void main(String[] args){
                  ^
0_0_25776851_11409\Main.java:10: 错误: 需要class, interface或enum
        while (in.hasNextInt()){
        ^
0_0_25776851_11409\Main.java:12: 错误: 需要class, interface或enum
            System.out.println(Sum(n));
            ^
0_0_25776851_11409\Main.java:13: 错误: 需要class, interface或enum
        }
        ^
10 个错误