What is a Socket?

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Answer:

Sockets provide the communication mechanism between two computers using TCP. A client program creates a socket on its end of the communication and attempts to connect that socket to a server.

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219. Advantages of Java Sockets?

Answer: Sockets are flexible and sufficient. Efficient socket based programming can be easily implemented for general communications. It cause low network traffic.

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Question: Fundamentals of Object-Oriented Programming Short

220. Disadvantages of Java Sockets?

Answer: Socket based communications allows only to send packets of raw data between applications. Both the client-side and server-side have to provide mechanisms to make the data useful in any way.

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Question: Fundamentals of Object-Oriented Programming Short

221. Which class is used by server applications to obtain a port and listen for client requests?

Answer: java.net.ServerSocket class is used by server applications to obtain a port and listen for client requests.

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Question: Fundamentals of Object-Oriented Programming Short

222. Which class represents the socket that both the client and server use to communicate with each other?

Answer: java.net.Socket class represents the socket that both the client and server use to communicate with each other.

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Question: Fundamentals of Object-Oriented Programming Short

223. Why Generics are used in Java?

Answer: Generics provide compile-time type safety that allows programmers to catch invalid types at compile time. Java Generic methods and generic classes enable programmers to specify, with a single method declaration, a set of related methods or, with a single class declaration, a set of related types.

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Question: Fundamentals of Object-Oriented Programming Short

224. What environment variables do I need to set on my machine in order to be able to run Java programs?

Answer: CLASSPATH and PATH are the two variables.

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Question: Fundamentals of Object-Oriented Programming Short

225. Is there any need to import java.lang package?

Answer: No, there is no need to import this package. It is by default loaded internally by the JVM.

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Question: Packages in java Short

226. What is Nested top-level class?

Answer: If a class is declared within a class and specify the static modifier, the compiler treats the class just like any other top-level class. Nested top-level class is an Inner class.

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Question: Class, Object and Methods in java Short

227. What is Externalizable interface?

Answer: Externalizable is an interface which contains two methods readExternal and writeExternal. These methods give you a control over the serialization mechanism.

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Question: Interface in java Short

228. If System.exit (0); is written at the end of the try block, will the finally block still execute?

Answer: No in this case the finally block will not execute because when you say System.exit (0); the control immediately goes out of the program, and thus finally never executes.

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Question: Fundamentals of Object-Oriented Programming Short

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