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View Compilation Error

0_0_29406520_24215\Main.java:1: 错误: 类FatMouseTrade1009是公共的, 应在名为 FatMouseTrade1009.java 的文件中声明
public class FatMouseTrade1009 {
       ^
0_0_29406520_24215\Main.java:36: 错误: 找不到符号
    private static double calculate(List<Point> list, Double own) {
                                    ^
  符号:   类 List
  位置: 类 FatMouseTrade1009
0_0_29406520_24215\Main.java:7: 错误: 找不到符号
        list = new ArrayList<>();
                   ^
  符号:   类 ArrayList
  位置: 类 FatMouseTrade1009
0_0_29406520_24215\Main.java:51: 错误: 找不到符号
                    Collections.swap(list, j, j+1);
                    ^
  符号:   变量 Collections
  位置: 类 FatMouseTrade1009
4 个错误


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