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Interview Questions

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Java Scripts 3
  What modifiers may be used with an inner class that is a member of an outer class?

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

   
  What is an Iterator interface?

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

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

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

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

  setBounds()

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

  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.

 
  What is the difference between yielding and sleeping?

  When a task invokes its yield() method, it returns to the ready state. When a task invokes its sleep() method, it returns to the waiting state.

 
  Which java.util classes and interfaces support event handling?

  The EventObject class and the EventListener interface support event processing.

 
  Is sizeof a keyword?

  The sizeof operator is not a keyword.

 
  What are wrapper classes?

  Wrapper classes are classes that allow primitive types to be accessed as objects.

 

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