View Compilation Error

0_0_15799590_23667\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_15799590_23667\Main.java:3: 错误: 需要class, interface或enum
		while(in.hasNext())
		^
0_0_15799590_23667\Main.java:6: 错误: 需要class, interface或enum
			int b=in.nextInt();
			^
0_0_15799590_23667\Main.java:7: 错误: 需要class, interface或enum
			System.out.println(a+b);
			^
0_0_15799590_23667\Main.java:8: 错误: 需要class, interface或enum
		}
		^
5 个错误