View Compilation Error

0_0_35040624_19011\Main.java:1: 错误: 需要class, interface或enum
Scanner sc = new Scanner(System.in);
^
0_0_35040624_19011\Main.java:2: 错误: 需要class, interface或enum
int a = sc.nextInt();
^
0_0_35040624_19011\Main.java:3: 错误: 需要class, interface或enum
int b = sc.nextInt();
^
0_0_35040624_19011\Main.java:4: 错误: 需要class, interface或enum
System.out.println(a + b);
^
4 个错误