Java MCQs with answers Page - 30

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Q. Which of the following is the highest class in the event delegation model?

  • (A) java.util.EventListner
  • (B) java.util.EventObject
  • (C) java.util.AWTEvent
  • (D) java.util.event.AWTEvent

A

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Q. When two or more objects are added as listeners for the same event, which listener is first invoked to handle the event?

  • (A) The first object that was added as listner.
  • (B) The last object that was added as listner
  • (C) There is no way to determine which listener will be invoked first.
  • (D) It is impossible to have more than one listener for a given event.

A

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Q. Suppose that you want to have an object eh handle the TextEvent of
TextArea object t. How should you add eh as the event handler for?

  • (A) t.addTextListener(eh);
  • (B) eh.addTextListner(t);
  • (C) addTextListner(eh.t);
  • (D) addTextListner(t,eh);

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Q. Which is true about a method-local inner class?

  • (A) It must be marked final.
  • (B) It can be marked abstract.
  • (C) It can be marked public.
  • (D) It can be marked static.

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Q. Which statement is static and synchronized in JDBC API?

  • (A) executeQuery()
  • (B) executeUpdate()
  • (C) getConnection()
  • (D) prepareCall()

A

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Q. Which driver is efficient and always preferable for using JDBC applications?

  • (A) Type – 4
  • (B) Type – 1
  • (C) Type – 3
  • (D) Type – 2

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Q. Which one of the following does not extends java.awt.Component

  • (A) CheckBox
  • (B) Canvas
  • (C) CheckbocGroup
  • (D) Label

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Q. What is default layout manager for panels and applets?

  • (A) Flowlayout
  • (B) Gridlayout
  • (C) BorderLayout
  • (D) none

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Q. Which of the following methods finds the maximum number of connections that a specific driver can obtain?

  • (A) Database.getMaxConnections
  • (B) Connection.getMaxConnection
  • (C) DatabaseMetaData.getMaxConnections
  • (D) ResultSetMetaData.getMaxConnections

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Q. What is the disadvantage of Type-4 Native-Protocol Driver?

  • (A) At client side, a separate driver is needed for each database.
  • (B) Type-4 driver is entirely written in Java
  • (C) The driver converts JDBC calls into vendor-specific database protocol
  • (D) It does not support to read MySQL data.

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