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Current Feed Content from 10 Oct 08 06:26

• How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters?

  Sat, 10 May 2008 09:35:00 +0000

  Unicode requires 16 bits and ASCII require 7 bits. Although the ASCII character set uses only 7 bits, it is usually represented as 8 bits. UTF-8 represents characters using 8, 16, and 18 bit patterns. UTF-16 uses 16-bit and larger bit patterns.

  noreply@blogger.com (Educational Information)

• Which method of the Component class is used to set the position and size of a component?

  Sat, 10 May 2008 09:35:00 +0000

  setBounds()

  noreply@blogger.com (Educational Information)

• What is the difference between the >> and >>> operators?

  Sat, 10 May 2008 09:34:00 +0000

  The >> operator carries the sign bit when shifting right. The >>> zero-fills bits that have been shifted out.

  noreply@blogger.com (Educational Information)

• What is an Iterator interface?

  Sat, 10 May 2008 09:34:00 +0000

  The Iterator interface is used to step through the elements of a Collection.

  noreply@blogger.com (Educational Information)

• What modifiers may be used with an inner class that is a member of an outer class?

  Sat, 10 May 2008 09:33:00 +0000

  A (non-local) inner class may be declared as public, protected, private, static, final, or abstract.

  noreply@blogger.com (Educational Information)

• What is the Vector class?

  Sat, 10 May 2008 09:33:00 +0000

  The Vector class provides the capability to implement a growable array of objects.

  noreply@blogger.com (Educational Information)

• How does Java handle integer overflows and underflows?

  Sat, 10 May 2008 09:33:00 +0000

  It uses those low order bytes of the result that can fit into the size of the type allowed by the operation.

  noreply@blogger.com (Educational Information)

• What is the List interface?

  Sat, 10 May 2008 09:32:00 +0000

  The List interface provides support for ordered collections of objects.

  noreply@blogger.com (Educational Information)

• which characters may be used as the second character of an identifier, but not as the first character of an identifier?

  Sat, 10 May 2008 09:32:00 +0000

  The digits 0 through 9 may not be used as the first character of an identifier but they may be used after the first character of an identifier.

  noreply@blogger.com (Educational Information)

• What are the Collections API?

  Sat, 10 May 2008 09:31:00 +0000

  The Collections API is a set of classes and interfaces that support operations on collections of objects.

  noreply@blogger.com (Educational Information)

• What state does a thread enter when it terminates its processing?

  Sat, 10 May 2008 09:31:00 +0000

  When a thread terminates its processing, it enters the dead state.

  noreply@blogger.com (Educational Information)

• Which containers use a FlowLayout as their default layout?

  Sat, 10 May 2008 09:31:00 +0000

  The Panel and Applet classes use the FlowLayout as their default layout.

  noreply@blogger.com (Educational Information)

• What method is used to specify a container's layout?

  Sat, 10 May 2008 09:30:00 +0000

  The setLayout() method is used to specify a container's layout.

  noreply@blogger.com (Educational Information)

• What is the preferred size of a component?

  Sat, 10 May 2008 09:29:00 +0000

  The preferred size of a component is the minimum component size that will allow the component to display normally.

  noreply@blogger.com (Educational Information)

• Is null a keyword?

  Fri, 18 Apr 2008 10:58:00 +0000

  The null value is not a keyword.

  noreply@blogger.com (Educational Information)

• What's new with the stop(), suspend() and resume() methods in JDK 1.2?

  Fri, 18 Apr 2008 10:57:00 +0000

  The stop(), suspend() and resume() methods have been deprecated in JDK 1.2.

  noreply@blogger.com (Educational Information)

• Can a lock be acquired on a class?

  Fri, 18 Apr 2008 10:57:00 +0000

  Yes, a lock can be acquired on a class. This lock is acquired on the class's Class object.

  noreply@blogger.com (Educational Information)

• What is synchronization and why is it important?

  Fri, 18 Apr 2008 10:57:00 +0000

  With respect to multithreading, synchronization is the capability to control the access of multiple threads to shared resources. Without synchronization, it is possible for one thread to modify a shared object while another thread is in the process of using or updating that object's value. This often leads to significant errors.

  noreply@blogger.com (Educational Information)

• How are Observer and Observable used?

  Fri, 18 Apr 2008 10:56:00 +0000

  Objects that subclass the Observable class maintain a list of observers. When an Observable object is updated it invokes the update() method of each of its observers to notify the observers that it has changed state. The Observer interface is implemented by objects that observe Observable objects.

  noreply@blogger.com (Educational Information)

• Why do threads block on I/O?

  Fri, 18 Apr 2008 10:56:00 +0000

  Threads block on i/o (that is enters the waiting state) so that other threads may execute while the i/o Operation is performed.

  noreply@blogger.com (Educational Information)

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