TAILIEUCHUNG - Lecture Java™ How to Program (8/e) - Chapter 17: Files, streams and object serialization

After completing this unit, you should be able to: To create, read, write and update files; to use class File to retrieve information about files and directories; the Java input/output stream class hierarchy; the differences between text files and binary files; sequential-access and random-access file processing; to use classes Scanner and Formatter to process text files;. | Java How to Program, 8/e (C) 2010 Pearson Education, Inc. All rights reserved. (C) 2010 Pearson Education, Inc. All rights reserved. (C) 2010 Pearson Education, Inc. All rights reserved. Data stored in variables and arrays is temporary It’s lost when a local variable goes out of scope or when the program terminates For long-term retention of data, computers use files. Computers store files on secondary storage devices hard disks, optical disks, flash drives and magnetic tapes. Data maintained in files is persistent data because it exists beyond the duration of program execution. (C) 2010 Pearson Education, Inc. All rights reserved. Ultimately, a computer processes data items as combinations of zeros and ones It’s simple and economical for engineers to build electronic devices that can assume two stable states—one representing 0 and the other representing 1. The smallest data item in a computer can assume the value 0 or the value 1. Such a data item is called a bit .

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