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Using ________, we can perform cleanup operations when the stream is closed.

  • catch
  • close
  • finally
  • try
In Java's Stream API, the close() method is used to perform cleanup operations when the stream is closed. This can be helpful when you need to release external resources or perform any necessary cleanup before the stream is no longer in use.
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Imagine you are developing a networking application that establishes a connection to various servers. How would you handle various types of I/O exceptions, ensuring that your application can fail gracefully and retry connecting to the server without impacting the user experience?

  • Handle all I/O exceptions with a single generic catch block. Retry connecting to the server immediately after an exception occurs without any delay.
  • Implement a single global catch block to handle all I/O exceptions and use a fixed retry interval for connecting to the server. Display a generic message to the user on repeated failures.
  • Use a combination of try-catch blocks to handle specific I/O exceptions like SocketTimeoutException and IOException. Implement retry logic with exponential backoff to retry connecting to the server. Maintain a counter to limit the number of retries.
  • Use a dedicated library or framework for handling networking connections and exceptions. Configure the library to handle I/O exceptions and retry logic automatically. Display user-friendly messages and provide options for users to retry or cancel the operation.
In a networking application, it's crucial to handle I/O exceptions gracefully. Option 1 recommends using specific try-catch blocks for different exception types, which allows for fine-grained error handling and implementing retry logic with backoff. Option 2 suggests an immediate retry without any delay, which can lead to repeated failures. Options 3 and 4 propose more generic approaches, which may not provide the same level of control and user-friendly handling.
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________ allows you to traverse the collection, access the element, and insert

  • Buffer
  • Enumeration
  • Iterator
  • Stream
The Iterator interface in Java allows you to traverse a collection, access elements, and insert elements in the middle of traversal using the remove() and add() methods. The other options do not provide this functionality.
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The process of instantiating a class and creating an object is also known as _______.

  • Abstraction
  • Declaration
  • Inheritance
  • Instantiation
The process of instantiating a class and creating an object is known as "Instantiation." When you instantiate a class, you create an object of that class, which can then be used to access its members.
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What happens to the result of a relational operation if both operands are NaN?

  • It returns false.
  • It returns true.
  • It throws a NaNException.
  • It throws a NullPointerException.
When both operands of a relational operation are NaN, Java returns false. This behavior is consistent with the IEEE 754 floating-point standard, which defines the behavior of floating-point numbers, including NaN. Options 2, 3, and 4 are incorrect because they don't reflect the actual behavior of Java in this situation.
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A thread that goes into the ________ state will not be brought back to the running state when its sleep time has elapsed or its operation is complete.

  • blocked
  • sleeping
  • terminated
  • waiting
Once a thread enters the "terminated" state, it cannot be brought back to the running state. The thread has completed its execution or has been explicitly terminated and cannot be resumed.
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What will happen if an exception is not caught by any catch block?

  • The exception will be automatically caught by the JVM.
  • The program will continue to execute normally.
  • The program will enter an infinite loop.
  • The program will terminate with an error.
In Java, if an exception is not caught by any catch block within the current method, it will propagate up the call stack, and if not caught anywhere, it will lead to program termination with an error message. This is essential for identifying and handling exceptional situations in a program.
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Which class is primarily used for implementing UDP sockets?

  • DatagramPacket
  • DatagramSocket
  • ServerSocket
  • Socket
In Java, the DatagramSocket class is primarily used for implementing UDP (User Datagram Protocol) sockets. It provides methods to send and receive UDP packets. The other options are not specific to UDP sockets.
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The class ________ is used to create a text field in JavaFX.

  • JText
  • Text
  • TextField
  • TextInputField
In JavaFX, the TextField class is used to create a single-line text input field. It allows users to enter text or data. The other options, Text, TextInputField, and JText, are not the correct classes for creating text fields in JavaFX.
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Which method of the String class is used to compare two strings for equality, ignoring case differences?

  • compareTo()
  • compareToIgnoreCase()
  • equals()
  • equalsIgnoreCase()
In Java, the equalsIgnoreCase() method of the String class is used to compare two strings for equality while ignoring differences in case. It returns true if the two strings are equal, regardless of whether the characters are in uppercase or lowercase. The other options, equals(), compareToIgnoreCase(), and compareTo(), do not perform case-insensitive comparisons.
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