Cannot import a package more than once

最新推荐文章于 2025-12-20 22:10:08 发布

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eclipse的.classpath文件

excluding标签是保证项目在启动时不会讲指定的目录jar加载到内存，只做编译引用。

http://www.blogjava.net/colorfire/archive/2010/12/09/340172.html

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TypeScript报错信息表（备注）

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code 类型英文描述中文描述 1002 错误 Unterminated string literal. 未终止的字符串文本。 1003 错误 Identifier expected. 应为标识符。 1005 错误 '{0}' expected. 应为“{0}”。 1006 错误 A file cannot have a reference to itself. 文件不能引用自身。 1009...

Failed to import package with error: Cannot import package in play mode.

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Unity2D 出现如题错误，发现是游戏正在运行，需要暂停后再import。

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cannot import name dataset；'sklearn' is not a package

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Python pycharm引用报错：cannot import name dataset；‘sklearn’ is not a package 出现的一个可能原因：py文件的名称起成了：sklearn。。。

Untiy导入package时报错Failed to import package with error: Couldn't decompress package

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Untiy导入package时报错Failed to import package with error: Couldn't decompress package

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今天在学习siki的塔防教程时发生了一件很尴尬的事情，那就是无法导入资源包里面是这样显示的 Failed to import package with error: Cannot import package in play mode. 我当时没有注意到这个问题，以为是简单的报错，过了一会再去试的时候出现了另一个报错 Failed importing packag

vue3 拖拽穿梭框

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视图通过 id 绑定 sortablejs 数据通过 data-xxx 自定义属性挂载 ts中通过id获取dom 实现拖拽 getNewArr函数通过自定义属性对数据做处理以下是全部代码官网链接下面是文档 Install with Bower: Import into your project: Cherrypick plugins: Usage You can use any element for the list and its element

[root@mcs-server MCPTT-Server]# yum install ffmpeg-devel Repository extras is listed more than once in the configuration CentOS Linux 8 - AppStream 0.0 B/s | 0 B 00:00 Errors during downloading metadata for repository 'appstream': - Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=container [Could not resolve host: mirrorlist.centos.org] Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=container [Could not resolve host: mirrorlist.centos.org]

06-10

Part 2: Java You are going to make a system that represents the seats in a venue, such as a theatre or a cinema, and a process for booking seats at events that are held in that venue. The tasks will get harder as you progress, and build on each other, so try to ensure that you complete each stage before moving on. We have provided initial versions of Seat.java and SeatType.java which you should use to complete the tasks. You can add any additional fields, methods, or modifiers to these classes as needed, and can also write and submit any additional classes that are needed, but please do not change the provided packages, class names, or method names. Here are the initial versions of the two files -- you should download these and use them to create your solution. SeatType.java Seat.java All classes you create should be in the boxOffice package. Java Task 2a: Representing individual seats (8 Marks) For our purposes, a seat has four core properties: The row, which must be a single character representing a capital letter A through Z The seat number, which must be a positive integer The seat type, which is represented by the provided SeatType enumerated type The availability, which is a Boolean value indicating whether the seat has been reserved 1. Write code to represent individual seats using the above properties. The full details of the implementation are up to you, but you must use the provided Seat.java file as a starting point for representing the core properties. A seat should be initially available when it is created, while the other properties should be set in the constructor. [4 marks] 2. Be sure that your constructor validates that the values of all core properties are valid: that is, the row and seat number are in range. If an attempt is made to create a seat object with invalid values, your constructor should throw an IllegalArgumentException with a descriptive message. [2 marks] 3. Include getter methods for all core properties, as well as a setter method for the availability property only. [1 mark] Java Task 2b: Representing a venue (8 Marks) A venue is a location such as a theatre which has a number of rows, each of which has a number of seats. The row letters always start at A, and the seat numbers always start at 1. Note that the number and distribution of seats may be different in each row. There can be at most 26 rows. For example, the following might be the seat configuration in a very small venue: Row/Seat 1 2 3 4 5 6 A Standard Deluxe Deluxe Standard B Deluxe Deluxe Deluxe C Standard Standard Standard Standard Standard Standard A venue configuration can be given by a string of the following format: - First line: number of rows - Remaining lines: seat configuration in each row, separated by spaces For example, the above venue would be specified by the following string: 3 S D D S D D D S S S S S S In Java, you could specify this string like this: “3\nS D D S\nD D D\nS S S S S S” 1. Create a class called Venue to represent the seats in a venue as described above, using your Seat class from Task 2a. You can use whatever internal representation you choose. Your class should have one constructor which should take a string like above and create the necessary Seat objects. You can assume that the string is well-formed and do not need to do any error checking. [4 marks] 2. Add a method to the Venue class with the following signature: public Seat getSeat (char row, int seatNum) This method should return the Seat object corresponding to the given row and seat number. If the row or seat number is invalid, this method should throw an IllegalArgumentException with a descriptive message. [2 marks] 3. Add a method to the Venue class with the following signature: public void printDetails() This method should print out the details of all seats in all rows of the venue in a human-readable form. The details are up to you, but simply using toString() on the internal representation will not be sufficient for full marks. [2 marks] Java Task 2c: Representing an event (8 Marks) An Event is a particular show that takes place at a venue. The details of an event include: The venue where the event will take place A price structure for tickets – that is, the price in pounds of each ticket type. For example, this might be: Standard tickets: £10 Deluxe tickets: £20 An event also allows seats to be reserved – a customer can request one or more seats of a given type (Standard or Deluxe). If a customer is booking more than one seat, the seats must be adjacent – that is, the seats must have consecutive numbers and be in the same row. Once a seat has been reserved by a customer, it cannot be reserved by another unless the seat is returned. 1. Create an Event class to represent the details of an event, using the classes from the previous tasks. You can assume that all ticket prices can be represented as integers. [2 marks] 2. Add a method reserveSeats to the Event class with the following signature: public int reserveSeats (int numSeats, SeatType seatType) This method should attempt to find the indicated number of adjacent seats of the given type that are available. If enough seats are found, they should all be reserved, and the total price of the seats returned. If enough seats are not found, no seats should be reserved and the method should return -1. [4 marks] 3. Add a method returnSeat to the Event class with the following signature: public void returnSeat (char row, intSeatNum) If the indicated seat is reserved, it should be made available again. If the indicated seat is already available, or if the row and seat number are invalid, this method should throw an IllegalArgumentException with appropriate information. [2 marks] Java submission Be sure that your classes are named as above, and that all classes are in the boxOffice package. You must submit all the .java files you wrote, including the final versions of Seat.java and SeatType.java. 我的seattype是package boxOffice; public enum SeatType { STANDARD, DELUXE; } 按照题目中给的变量和参数执行

12-10

throw new IllegalArgumentException("Seat type cannot be null or empty."); } this.row = row; this.number = number; this.type = type; this.isReserved = false; } // Getter 方法 public int ...

ImportError ：cannot import name xxxxxx 的三种类型的解决方法

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