Core Java 면접 질문과 답변
Test your skills through the online practice test: Core Java Quiz Online Practice Test
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Ques 241. What is the purpose of the File class?
The File class is used to create objects that provide access to the files and directories of a local file system.
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Ques 242. What is a socket?
A socket is an endpoint for communication between two machines.
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Ques 243. How do I convert a numeric IP address like 192.18.97.39 into a hostname like java.sun.com?
String hostname = InetAddress.getByName("192.18.97.39").getHostName();
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Ques 244. How can my application get to know when a HttpSession is removed?
Define a Class HttpSessionNotifier which implements HttpSessionBindingListener and implement the functionality what you need in valueUnbound() method. Create an instance of that class and put that instance in HttpSession.
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Ques 245. How will you invoke any external process in Java?
Runtime.getRuntime().exec('.)
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