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

Chapter 18 Binary I/O

1. Although it is not technically precise, a text file consists of a sequence of

characters and a binary file consists of a sequence of bits. You can use a text

editor to view a text file, but not a binary file.

2. You have to use Java I/O classes to create objects and use the methods in the

objects to perform I/O. A Java I/O object is called a stream. An object for reading

data is called an input stream and an object for writing data is called an output

stream.

3. Binary I/O reads a byte from a file and copies it directly to the memory with any

5. The values stored in the text file are 0x41 0x42 0x43.

6. If you write string "100" to an ASCII text file, the values stored are 0x31 0x30

0x30. If you write a numeric byte-type value 100 using binary I/O, the value

stored in the file is 0x64.

7. The encoding scheme for representing a character in a Java program is the

Unicode. By default, a text file is encoded using ASCII.

8. Almost all the methods and constructors in Java I/O classes, because there are

always some unexpected situation may arise during I/O.

9. Two reasons: (1) closing a stream ensures that data will be written to the file. (2)

closing a stream release resource acquired by the stream object.

FileInputStream(File) to create a new FileInputStream and use new

FileOutputStream(filename), new FileOutputStream(File), new