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View Compilation Error

0_0_3179919_8231\Main.java:1: 类 Abc 是公共的,应在名为 Abc.java 的文件中声明
public class Abc {
       ^
0_0_3179919_8231\Main.java:4: 找不到符号
符号: 类 Scanner
位置: 类 Abc
		Scanner input=new Scanner(System.in);
		^
0_0_3179919_8231\Main.java:4: 找不到符号
符号: 类 Scanner
位置: 类 Abc
		Scanner input=new Scanner(System.in);
		                  ^
3 错误


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