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Core Java Interview Question Page 13


Question: What is an Iterator interface?

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

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

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

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

Answer: setBounds()

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

Answer: 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.

Question: What is the difference between yielding and sleeping?

Answer: 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.

Question: Which java.util classes and interfaces support event handling?

Answer: The EventObject class and the EventListener interface support event processing.

Question: Is sizeof a keyword?

Answer: The sizeof operator is not a keyword.

Question: What are wrapped classes?

Answer: Wrapped classes are classes that allow primitive types to be accessed as objects.

Question: Does garbage collection guarantee that a program will not run out of memory?

Answer: Garbage collection does not guarantee that a program will not run out of memory. It is possible for programs to use up memory resources faster than they are garbage collected. It is also possible for programs to create objects that are not subject to garbage collection

Question: What restrictions are placed on the location of a package statement within a source code file?

Answer: A package statement must appear as the first line in a source code file (excluding blank lines and comments).

Question: Can an object's finalize() method be invoked while it is reachable?

Answer: An object's finalize() method cannot be invoked by the garbage collector while the object is still reachable. However, an object's finalize() method may be invoked by other objects.

Question: What is the immediate superclass of the Applet class?

Answer: Panel

Question: What is the difference between preemptive scheduling and time slicing?

Answer: Under preemptive scheduling, the highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence. Under time slicing, a task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.

Question: Name three Component subclasses that support painting.

Answer: The Canvas, Frame, Panel, and Applet classes support painting.

Question: What value does readLine() return when it has reached the end of a file?

Answer: The readLine() method returns null when it has reached the end of a file.

Question: What is the immediate superclass of the Dialog class?

Answer: Window


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Current Comments

2 comments so far (post your own) View All Comments Latest 10 Comments:

its a very useful for me

Posted by praveenkumar on Saturday, 10.24.09 @ 20:31pm | #92098

In question <What is the difference between yielding and sleeping?>

Both return to ready state. However, sleep allows to "yield"
to processes with lower priority. A process can not yield to a lower-priority process. There may be more minor differences.

Posted by DMitriy on Monday, 12.1.08 @ 10:16am | #82244

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