All About JAVA - Top Blogging

All About JAVA

All About JAVA

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Articles

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

2008-05-10 04:35:51

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 the >> and >>> operators?

2008-05-10 04:35:01

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

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

2008-05-10 04:34:15

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

How does Java handle integer overflows and underflows?

2008-05-10 04:33:27

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

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

2008-05-10 04:32:45

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....

What are the Collections API?

2008-05-10 04:32:19

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

What is the preferred size of a component?

2008-05-10 04:30:23

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

What is synchronization and why is it important?

2008-04-18 05:57:28

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. ...

How are Observer and Observable used?

2008-04-18 05:57:08

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. ...

Why do threads block on I/O?

2008-04-18 05:56:46

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