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View Compilation Error

655433_0_0_28562\Main.java:1: 类 hd1001 是公共的,应在名为 hd1001.java 的文件中声明
public class hd1001 {
       ^
655433_0_0_28562\Main.java:15: 找不到符号
符号: 类 InputStreamReader
位置: 类 hd1001
			InputStreamReader din = new InputStreamReader(System.in);
                        ^
655433_0_0_28562\Main.java:15: 找不到符号
符号: 类 InputStreamReader
位置: 类 hd1001
			InputStreamReader din = new InputStreamReader(System.in);
                                                    ^
655433_0_0_28562\Main.java:16: 找不到符号
符号: 类 BufferedReader
位置: 类 hd1001
			BufferedReader in = new BufferedReader(din);
                        ^
655433_0_0_28562\Main.java:16: 找不到符号
符号: 类 BufferedReader
位置: 类 hd1001
			BufferedReader in = new BufferedReader(din);
                                                ^
655433_0_0_28562\Main.java:18: 找不到符号
符号: 类 IOException
位置: 类 hd1001
		} catch (IOException e) {
                         ^
6 错误


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