View Compilation Error

0_0_18812317_27419\Main.java:3: 错误: 需要class, interface或enum
    public static void main(String[] args) throws IOException {
                  ^
0_0_18812317_27419\Main.java:6: 错误: 需要class, interface或enum
        int t = (new Integer(sin.readLine()));
        ^
0_0_18812317_27419\Main.java:7: 错误: 需要class, interface或enum
        if (t > 100) {
        ^
0_0_18812317_27419\Main.java:9: 错误: 需要class, interface或enum
        } else if (t >= 90) {
        ^
0_0_18812317_27419\Main.java:11: 错误: 需要class, interface或enum
        } else if (t >= 80) {
        ^
0_0_18812317_27419\Main.java:13: 错误: 需要class, interface或enum
        } else if (t >= 70) {
        ^
0_0_18812317_27419\Main.java:15: 错误: 需要class, interface或enum
        } else if (t >= 60) {
        ^
0_0_18812317_27419\Main.java:17: 错误: 需要class, interface或enum
        } else if (t >= 0) {
        ^
0_0_18812317_27419\Main.java:19: 错误: 需要class, interface或enum
        } else {
        ^
0_0_18812317_27419\Main.java:21: 错误: 需要class, interface或enum
        }
        ^
10 个错误