View Compilation Error

0_0_30763397_24193\Main.java:1: 错误: 需要class, interface或enum
public static void main(String []args){
              ^
0_0_30763397_24193\Main.java:3: 错误: 需要class, interface或enum
    int b;
    ^
0_0_30763397_24193\Main.java:4: 错误: 需要class, interface或enum
    System.out.println(a+b);
    ^
0_0_30763397_24193\Main.java:7: 错误: 需要class, interface或enum
} 
^
4 个错误