Core Java preguntas y respuestas de entrevista
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Pregunta 236. What is the difference between the File and RandomAccessFile classes?
The File class encapsulates the files and directories of the local file system. The RandomAccessFile class provides the methods needed to directly access data contained in any part of a file.
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Pregunta 237. What interface must an object implement before it can be written to a stream as an object?
An object must implement the Serializable or Externalizable interface before it can be written to a stream as an object.
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Pregunta 238. What value does readLine() return when it has reached the end of a file?
The readLine() method returns null when it has reached the end of a file.
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Pregunta 239. What value does read() return when it has reached the end of a file?
The read() method returns -1 when it has reached the end of a file.
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Pregunta 240. What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?
The Reader/Writer class hierarchy is character-oriented, and the InputStream/OutputStream class hierarchy is byte-oriented.
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Lo mas util segun los usuarios:
- How could Java classes direct program messages to the system console, but error messages, say to a file?
- What are the differences between an interface and an abstract class?
- Why would you use a synchronized block vs. synchronized method?
- How can you force garbage collection?
- What are the differences between the methods sleep() and wait()?