148)What are wrapper classes?
| Wrapper classes are classes that allow primitive types to be accessed as objects. |
149)What is a native method?
| A native method is a method that is implemented in a language other than Java. |
150)What is the purpose of the System class?
| The purpose of the System class is to provide access to system resources. |
151)What comes to mind when someone mentions a shallow copy in Java?
152)What is singleton class?
| Singleton class means that any given time only one instance of the class is present, in one JVM. |
AWT and SWING Interview Questions
153)Which containers use a border layout as their default layout?
| The Window, Frame and Dialog classes use a border layout as their default layout. |
154)Which containers use a FlowLayout as their default layout?
| The Panel and Applet classes use the FlowLayout as their default layout. |
155)What are peerless components?
| The peerless components are called light weight components. |
156)is the difference between a Scrollbar and a ScrollPane?
| A Scrollbar is a Component, but not a Container. A
ScrollPane is a Container. A ScrollPane handles its own events and
performs its own scrolling. |
157)What is a lightweight component?
| Lightweight components are the one which doesn?t go with
the native call to obtain the graphical units. They share their parent
component graphical units to render them. For example, Swing components.
|
158)What is a heavyweight component?
| For every paint call, there will be a native call to get the graphical units.For Example, AWT. |
159)What is an applet?
| An applet is a small java program that runs inside the browser and generates dynamic contents. |
160)Can you write a Java class that could be used both as an applet as well as an application?
| . Yes. Add a main() method to the applet. |
Internationalization Interview Questions
161)What is Locale?
| A Locale object represents a specific geographical, political, or cultural region. |
162)How will you load a specific locale?
| By ResourceBundle.getBundle(?) method. |
Java Bean Interview Questions
163)What is a JavaBean?
| are reusable software components written in the Java
programming language, designed to be manipulated visually by a software
develpoment environment, like JBuilder or VisualAge for Java. |
RMI Interview Questions
164)Can RMI and Corba based applications interact?
| Yes they can. RMI is available with IIOP as the transport protocol instead of JRMP. |
JDBC Interview Questions
165)What is JDBC?
| JDBC is a Java API that is used to connect and execute
query to the database. JDBC API uses jdbc drivers to connects to the
database.
more details...
|
166)What is JDBC Driver?
JDBC Driver is a software component that enables java
application to interact with the database.There are 4 types of JDBC
drivers:
- JDBC-ODBC bridge driver
- Native-API driver (partially java driver)
- Network Protocol driver (fully java driver)
- Thin driver (fully java driver)
more details...
|
167)What are the steps to connect to database in java?
- Register the driver class
- Creating connection
- Creating statement
- Executing queries
- Closing connection
more details...
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168)What is the difference between Statement and PreparedStatement interface?
|
In case of Statement, query is complied each time whereas in case of
PreparedStatement, query is complied only once. So performance of
PreparedStatement is better than Statement.
more details...
|
169)How can we execute stored procedures and functions?
|
By using Callable statement interface, we can execute procedures and funtions.
|
170)How can we store and retrieve images from the database?
|
By using PreparedStaement interface, we can store and retrieve images. To see examples click here... |
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