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View Compilation Error

0_0_12781315_3367\Main.java:1: 类 main 是公共的,应在名为 main.java 的文件中声明
public class main{ 
       ^
0_0_12781315_3367\Main.java:4: 找不到符号
符号: 类 Scanner
位置: 类 main
        Scanner in = new Scanner(System.in);
        ^
0_0_12781315_3367\Main.java:4: 找不到符号
符号: 类 Scanner
位置: 类 main
        Scanner in = new Scanner(System.in);
                         ^
3 错误


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