View Compilation Error

0_0_37316802_3451\Main.java:2: 错误: 需要class, interface或enum
public static void main(String args){
              ^
0_0_37316802_3451\Main.java:4: 错误: 需要class, interface或enum
    double a=in.nextDouble();
    ^
0_0_37316802_3451\Main.java:5: 错误: 需要class, interface或enum
    double b=in.nextDouble();
    ^
0_0_37316802_3451\Main.java:6: 错误: 需要class, interface或enum
    System.out.println(a+b); 
    ^
0_0_37316802_3451\Main.java:7: 错误: 需要class, interface或enum
}
^
5 个错误