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View Compilation Error

0_0_35105470_11140\Main.java:1: 错误: 类A_add_B是公共的, 应在名为 A_add_B.java 的文件中声明
public class A_add_B {
       ^
0_0_35105470_11140\Main.java:3: 错误: 找不到符号
        Scanner scanner = new Scanner(System.in);
        ^
  符号:   类 Scanner
  位置: 类 A_add_B
0_0_35105470_11140\Main.java:3: 错误: 找不到符号
        Scanner scanner = new Scanner(System.in);
                              ^
  符号:   类 Scanner
  位置: 类 A_add_B
3 个错误


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