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View Compilation Error

0_0_35796134_21733\Main.java:1: 错误: 类Sum4是公共的, 应在名为 Sum4.java 的文件中声明
public class Sum4 {
       ^
0_0_35796134_21733\Main.java:3: 错误: 找不到符号
        Scanner scan = new Scanner(System.in);
        ^
  符号:   类 Scanner
  位置: 类 Sum4
0_0_35796134_21733\Main.java:3: 错误: 找不到符号
        Scanner scan = new Scanner(System.in);
                           ^
  符号:   类 Scanner
  位置: 类 Sum4
0_0_35796134_21733\Main.java:6: 错误: 找不到符号
        BigInteger number1,number2;
        ^
  符号:   类 BigInteger
  位置: 类 Sum4
0_0_35796134_21733\Main.java:12: 错误: 找不到符号
            number1 = new BigInteger(str1);
                          ^
  符号:   类 BigInteger
  位置: 类 Sum4
0_0_35796134_21733\Main.java:13: 错误: 找不到符号
            number2 = new BigInteger(str2);
                          ^
  符号:   类 BigInteger
  位置: 类 Sum4
6 个错误


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