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View Compilation Error

0_0_13081199_16736\Main.java:1: 类 Hdacm 是公共的,应在名为 Hdacm.java 的文件中声明
public class Hdacm {
       ^
0_0_13081199_16736\Main.java:5: 找不到符号
符号: 类 Scanner
位置: 类 Hdacm
		Scanner in;
		^
0_0_13081199_16736\Main.java:8: 找不到符号
符号: 类 Scanner
位置: 类 Hdacm
        in=new Scanner(System.in);
               ^
3 错误


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