View Compilation Error

0_0_39404044_3164\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_39404044_3164\Main.java:3: 错误: 需要class, interface或enum
        while(scanner.hasNext()){
        ^
0_0_39404044_3164\Main.java:5: 错误: 需要class, interface或enum
            int b= scanner.nextInt();
            ^
0_0_39404044_3164\Main.java:6: 错误: 需要class, interface或enum
            System.out.println(a+b);
            ^
0_0_39404044_3164\Main.java:7: 错误: 需要class, interface或enum
        }
        ^
5 个错误