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View Compilation Error

0_0_29515325_7640\Main.java:3: 错误: 类sum是公共的, 应在名为 sum.java 的文件中声明
public class sum{
       ^
0_0_29515325_7640\Main.java:1: 错误: 找不到符号
import java.util.Scannner;
                ^
  符号:   类 Scannner
  位置: 程序包 java.util
0_0_29515325_7640\Main.java:5: 错误: 找不到符号
Scanner input= new Scanner(System.in);
^
  符号:   类 Scanner
  位置: 类 sum
0_0_29515325_7640\Main.java:5: 错误: 找不到符号
Scanner input= new Scanner(System.in);
                   ^
  符号:   类 Scanner
  位置: 类 sum
4 个错误


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