View Compilation Error

0_0_34344339_12124\Main.java:1: 错误: 需要class, interface或enum
Scanner sc=new Scanner(System.in);
^
0_0_34344339_12124\Main.java:2: 错误: 需要class, interface或enum
		int a=sc.nextInt();
		^
0_0_34344339_12124\Main.java:3: 错误: 需要class, interface或enum
		int b=sc.nextInt();
		^
0_0_34344339_12124\Main.java:4: 错误: 需要class, interface或enum
		System.out.println(a+b);
		^
4 个错误