View Compilation Error

0_0_28640408_12942\Main.java:3: 错误: 需要class, interface或enum
	public static void main(String[] args) {
	              ^
0_0_28640408_12942\Main.java:5: 错误: 需要class, interface或enum
		while(scan.hasNext()) {
		^
0_0_28640408_12942\Main.java:7: 错误: 需要class, interface或enum
			a = scan.nextInt();
			^
0_0_28640408_12942\Main.java:8: 错误: 需要class, interface或enum
			b = scan.nextInt();
			^
0_0_28640408_12942\Main.java:9: 错误: 需要class, interface或enum
			if (a==0&&b==0) break;
			^
0_0_28640408_12942\Main.java:10: 错误: 需要class, interface或enum
			System.out.println(a+b);
			^
0_0_28640408_12942\Main.java:11: 错误: 需要class, interface或enum
		}
		^
7 个错误