Programming Java

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2. 2 Contents Files and Directories Character Streams Buffered Character Streams The PrintWriter Class Byte Streams Random Access Files The StreamTokenizer Class Object Serialization The Java New I/O Writing Files Reading Files

3. 3 Files and Directories

4. 4 Files and Directories

5. 5 Character Streams

6. 6 Character Streams

7. 7 Character Streams

8. 8 Character Streams

9. 9 Character Streams

10. 10 Character Stream Examples

11. 11 Buffered Character Streams

12. 12 Character Stream Examples

13. 13 The PrintWriter Class

14. 14 Byte Streams (Binary Streams)

15. 15 Byte Streams

16. 16 Byte Streams

17. 17 Byte Streams

18. 18 Byte Streams (DataOutput Interface)

19. 19 Byte Streams (InputStream Interface)

20. 20 Byte Streams (DataInput Interface)

21. 21 Byte Streams (Example)

22. 22 Buffered[Input/Output]Stream Examples

23. 23 DataOutputStream Examples

24. 24 Random Access Files

25. 25 The StreamTokenizer Class

26. 26 StreamTokenizer Example 1

27. 27 StreamTokenizer Example 2

28. 28 Object Serialization What is Object Serialization? Process of reading and writing objects Writing an object is to represent its state in a serialized form sufficient to reconstruct the object as it is read. Object serialization is essential to building all but the most transient applications. Examples of using the object serialization Remote Method Invocation (RMI)--communication between objects via sockets Lightweight persistence--the archival of an object for use in a later invocation of the same program

29. 29 Serializing Objects How to Write to an ObjectOutputStream Writing objects to a stream is a straight-forward process. Example of constructing a Date object and then serializing that object: FileOutputStream out = new FileOutputStream("theTime"); ObjectOutputStream s = new ObjectOutputStream(out); s.writeObject("Today"); s.writeObject(new Date()); s.flush();

30. 30 Serializing Objects How to Read from an ObjectOutputStream Example that reads in the String and the Date object that was written to the file named theTime in the read example: FileInputStream in = new FileInputStream("theTime"); ObjectInputStream s = new ObjectInputStream(in); String today = (String)s.readObject(); Date date = (Date)s.readObject();

31. 31 Serializing Objects Providing Object Serialization for Your Classes Implementing the Serializable Interface Customizing Serialization Implementing the Externalizable Interface Protecting Sensitive Information [ObjectFileTest.java] /home/course/prog3/examples/objserial/ObjectFileTest.java

32. 32 The Java New I/O

33. 33 The Java New File I/O

34. 34 Writing Files

35. 35 Writing Files

36. 36 Writing Files

37. 37 Writing Files

38. 38 Writing Files

39. 39 Writing Files

40. 40 Writing Files

41. 41 Writing Files

42. 42 Writing Files

43. 43 Writing Files

44. 44 Writing Files

45. 45 Writing Files

46. 46 Writing Files

47. 47 Writing Files

48. 48 Writing Files

49. 49 Writing Files

50. 50 Writing Files

51. 51 Reading Files

52. 52 Reading Files

53. 53 Reading Files

54. 54 Exercise Step 1 Creating Information Summarizer (Use the FileInputStream and BufferedReader Class) Related Slides : #5 � 10 Step 2 (Using the DataInput/OutputStream Class) Related Slides : #14 � 19 Step 3 (Re-write the Step 2 Using the New I/O package) Related Slides : #32 � 51 Step 4 (Mixed-Data Processing Using the New I/O package) Related Slides : #32 � 52 Step 5 (A Stream Tokenizer) Related Slides : #25-27 Option (Object Serialization) Related Slides : #28-31