Java FAQ

d

d

There are two types

1.Checked
2.Unchecked

Unchecked exceptions are you are not understood at compile time. It is a critical problem for the user.

B

The concept of polymorphism is often expressed by ...

Single Interface, Multiple methods

No. Java was intially called "Green".
This is correct answers

Oak

True

true

Yes its true.

The statement is True

A) It must have a package statement

hi, offcourse it is B.when file is complied ,it is save as .java extention...thanku....

B) Six

Swing provides six text components.All of Swing's text components inherit from the same superclass, JTextComponent.

 - Himanshu

Thats an excellent question. Try this, It works. Because main() is a static method. So, We can call static methods from another class static method. ClassB { public static void main(String[] args) { ...

Protective wrapper that prevents the code and data from being arbitrarily accessed by the other code defined outside the wrapper.

Binding of data and methods into a single unit is called encapsulation.

4

Three

List list;
Map map = new HashMap();
for (Item i : list) map.put(i.getKey(),i);

Only 4 ways.
1) Class c=new Class(); -->Using new operator
2) Class.forName("Class"); -->Using class.forName
3) NumberFormat object=NumberFormat.getNumberInstance(); -->Using Factory methods
4) Class c=new Class();
Class c2=(Class)c.clone(); -->using Cloning

1.newInstance()
2.static factory()
3.InstanceFactory()
4.factoryPattern()
5.deserialization
6clonning
7.new keyword.

packages is nothing but Classes and Interfaces and sub-packages.
Sub-packages is nothing but Classes and Interfaces and sub-sub-packages.

A package is a container which consists of classes and interfaces.

wrapper classes are the base class for the primitive datatypes.To be accessed as objects;
wrapper classes are used to be able to use primitive datatypes as objects...............

another informative thing is;

there are 8 wrapper classes in J2EE

java is a platform independent and pure object oriented programming language. the java programs mainly developed for embedded system application.

JasperReports is a powerful open source Java reporting tool that has the ability to deliver rich content onto the screen, to the printer or into PDF, HTML, XLS, CSV and XML files.
Check this link out http://java-source.net/open-source/charting-and-reporting/jasperreports

"java import java.io.ByteArrayOutputStream; java.io.IOException; import java.util.zip.GZIPOutputStream; import java.util.zip.*; public class zipUtil{ public static String compress...

A Java Decompiler (JD) can convert back the Bytecode (the .class file) into the source code (the .java file).

A deadlock occurs when one thread has the control for A and tries to get the control for B while another thread has the control for B and tries to get the control for A. Each will wait forever for the...