View Compilation Error

0_0_33495733_22511\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_33495733_22511\Main.java:6: 错误: 需要class, interface或enum
        while (in.hasNext()) {
        ^
0_0_33495733_22511\Main.java:8: 错误: 需要class, interface或enum
            int b = in.nextInt();
            ^
0_0_33495733_22511\Main.java:9: 错误: 需要class, interface或enum
            int res = sum(a,b);
            ^
0_0_33495733_22511\Main.java:13: 错误: 需要class, interface或enum
            System.out.println(res);
            ^
0_0_33495733_22511\Main.java:17: 错误: 需要class, interface或enum
        }
        ^
0_0_33495733_22511\Main.java:27: 错误: 需要class, interface或enum
    static public int sum(int a, int b) {
                  ^
0_0_33495733_22511\Main.java:29: 错误: 需要class, interface或enum
    }
    ^
8 个错误