Java MCQs with answers Page - 29

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Q. Interfaces helps in which type of inheritance

  • (A) Multiple inheritance
  • (B) Multilevel inheritance
  • (C) Hierarchical inheritance
  • (D) None of above

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Q. Which of these values is returned by read () method is end of file (EOF) is encountered?

  • (A) 0
  • (B) 1
  • (C) -1
  • (D) Null

A

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Q. Which of these exception is thrown by close () and read () methods?

  • (A) IOException
  • (B) FileException
  • (C) FileNotFoundException
  • (D) FileInputOutputException

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Q. Which exception is thrown by the read ( ) method of input stream class?

  • (A) Exception
  • (B) ClassNotFoundException
  • (C) read Exception
  • (D) IOException

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Q. What garbage collection in the context of java?

  • (A) The operating system periodically deletes all of the java files available on the system.
  • (B) Any package imported in a program and not used in automatically deleted.
  • (C) When all references to an object are gone, the memory used by the object is automatically reclaim
  • (D) None of the above

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Q. In order for a source code file, containing the public class test, to successfully compile, which of the following must be true?

  • (A) It must have a package statement
  • (B) It must be named test.java
  • (C) It must import java.lang
  • (D) It must declare a public class named test.

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Q. Which of the following are true about the Error and Exception classes?

  • (A) Both classes extend throwable
  • (B) The error class is final and exception class is not.
  • (C) The Exception class is final and the Error is not.
  • (D) Both classes implement Throwable

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Q. Which of the following are true?

  • (A) The void class extends the class class
  • (B) The float class extends double class
  • (C) The system class extends the runtime class
  • (D) The integer class extends the number class

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Q. How do you create a Reader object from an InputStream object?

  • (A) Use the static createReader() method of InputStream class
  • (B) Use the static createReader() method of Reader class
  • (C) Create an InputStreamReader object passing the InputStream object and an argument to the InputStreamReader constructor.
  • (D) Create an OutputStreamReader object, passing the InputStream object as an argument to the OutputStreamReader constructor.

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Q. Which of the following is true?

  • (A) The event inheritance model has replaced the event delegation model
  • (B) The event inheritance model is more efficient than event delegation model
  • (C) The event delegation model uses event listeners to define the methods of event handling classes.
  • (D) The event delegation model uses the handleEvent() method to support event handling.

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