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View Compilation Error

0_0_39746201_7381\Main.java:13: 错误: 找不到符号
            Stack<Double> stack = new Stack<>();
            ^
  符号:   类 Stack
  位置: 类 Main
0_0_39746201_7381\Main.java:13: 错误: 找不到符号
            Stack<Double> stack = new Stack<>();
                                      ^
  符号:   类 Stack
  位置: 类 Main
2 个错误


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