Core Java Interviewfragen und Antworten
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Frage 231. What is inner class?
If the methods of the inner class can only be accessed via the instance of the inner class, then it is called inner class.
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Frage 232. What is the use of serializable?
To persist the state of an object into any perminant storage device.
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Frage 233. Why do threads block on I/O?
Threads block on i/o (that is enters the waiting state) so that other threads may execute while the I/O operation is performed.
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Frage 234. What class allows you to read objects directly from a stream?
The ObjectInputStream class supports the reading of objects from input streams.
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Frage 235. What an I/O filter?
An I/O filter is an object that reads from one stream and writes to another, usually altering the data in some way as it is passed from one stream to another.
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Am hilfreichsten laut Nutzern:
- 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()?