View Compilation Error

0_0_21270386_27584\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_21270386_27584\Main.java:3: 错误: 需要class, interface或enum
		int a,b,sum;
		^
0_0_21270386_27584\Main.java:4: 错误: 需要class, interface或enum
		while(input.hasNextInt()){
		^
0_0_21270386_27584\Main.java:6: 错误: 需要class, interface或enum
			b=input.nextInt();
			^
0_0_21270386_27584\Main.java:7: 错误: 需要class, interface或enum
			sum = a+b;
			^
0_0_21270386_27584\Main.java:8: 错误: 需要class, interface或enum
			System.out.println(sum);
			^
0_0_21270386_27584\Main.java:9: 错误: 需要class, interface或enum
		}
		^
7 个错误