conversion from double to int

时间: 2023-04-23 21:05:23 浏览: 592

Java语言程序设计基础篇课后题答案-Chapter18BinaryI_O.pdf

Stream are concrete implementations, providing direct access to the underlying operating system's file I/O facilities. These classes are used for binary input and output, where data is read and written in raw bytes without any conversion. 12. In Java, `FileInputStream` and `FileOutputStream` are the primary classes for performing binary input and output operations on files. They extend the `InputStream` and `OutputStream` classes respectively, which form the base for all input and output streams in Java. 13. To read a binary file using `FileInputStream`, you would typically create an instance of `FileInputStream`, passing the file path as a parameter, then call the `read()` method repeatedly to read bytes from the file. The `read()` method returns the next byte as an integer between 0 and 255, or -1 if the end of the file has been reached. ```java try (FileInputStream fis = new FileInputStream("path_to_your_file")) { int byteRead; while ((byteRead = fis.read()) != -1) { // Process the byte } } catch (IOException e) { e.printStackTrace(); } ``` 14. Similarly, to write to a binary file using `FileOutputStream`, you initialize a `FileOutputStream` object with the desired file path, then call the `write(int)` method to write a byte to the file. If you want to write an array of bytes, you can use the `write(byte[])` or `write(byte[], int, int)` method. ```java try (FileOutputStream fos = new FileOutputStream("path_to_your_file")) { byte[] bytesToWrite = {0x41, 0x42, 0x43}; // ABC in bytes fos.write(bytesToWrite); } catch (IOException e) { e.printStackTrace(); } ``` 15. `DataInputStream` and `DataOutputStream` are used for more structured binary I/O. They provide methods to read and write primitive data types like `int`, `float`, `double`, and `long`. These streams handle type conversions automatically, making it easier to read and write complex data structures. 16. When working with binary files, it's crucial to understand the concept of byte order, especially when dealing with multi-byte data types like integers or floating-point numbers. Big-endian and little-endian refer to the order in which bytes are stored. Java uses big-endian by default. 17. The `BufferedInputStream` and `BufferedOutputStream` classes are used to improve performance by buffering data before transferring it. This reduces the number of actual I/O operations, which can significantly speed up file transfers. 18. Error handling is essential in I/O operations, as issues like file not found, permission denied, or network errors can occur. Therefore, all I/O methods that can throw exceptions should be enclosed in a try-catch block, or use try-with-resources for auto-closing resources. 19. Closing streams is critical because it ensures all buffered data is flushed to the file and releases system resources. Failure to close streams can lead to data loss or resource leaks. 20. In conclusion, Java's binary I/O system provides a comprehensive set of tools for reading and writing binary data efficiently and reliably. Understanding these concepts is fundamental for developing robust applications that handle files and data storage effectively.

将double转换为int的方法是使用强制类型转换符号，即将double值放在括号内，前面加上int，例如： double d = 3.14; int i = (int)d; 这将把d的值转换为整数，并将其存储在i中。请注意，这将截断小数部分，因此在进行此转换时应谨慎。

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conversion from double to int

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