View Compilation Error

0_0_39639556_31832\Main.java:1: 错误: 需要class, interface或enum
public static void main() {
              ^
0_0_39639556_31832\Main.java:3: 错误: 需要class, interface或enum
        ArrayList<Integer> A = new ArrayList<>();
        ^
0_0_39639556_31832\Main.java:4: 错误: 需要class, interface或enum
        while(sc.hasNext())
        ^
0_0_39639556_31832\Main.java:7: 错误: 需要class, interface或enum
        }
        ^
0_0_39639556_31832\Main.java:8: 错误: 需要class, interface或enum
        for (int i = 0; i < A.size(); i=i+2) {
                        ^
0_0_39639556_31832\Main.java:8: 错误: 需要class, interface或enum
        for (int i = 0; i < A.size(); i=i+2) {
                                      ^
0_0_39639556_31832\Main.java:10: 错误: 需要class, interface或enum
        }
        ^
7 个错误