Skip to main content

Daily Java questions

1​. What do you know about Java?

Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX.

2. What are the supported platforms by JavaProgramming Language?

Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX/Linux like HP-Unix, Sun Solaris, Redhat Linux, Ubuntu, CentOS, etc.

3. List any five features of Java?

Some features include Object Oriented

Platform Independent

Robust

Interpreted

Multi-threaded

4. Why is Java Architectural Neutral?

It’s compiler generates an architecture-neutral object file format, which makes the compiled code to be executable on many processors, with the presence of Java runtime system.

5. What is a singleton class? Give a practical example of its usage.

A singleton class in java can have only one instance and hence all its methods and variables belong to just one instance. Singleton class concept is useful for the situations when there is a need to limit the number of objects for a class.

The best example of singleton usage scenario is when there is a limit of having only one connection to a database due to some driver limitations or because of any licensing issues.

Comments

Post a Comment

Popular posts from this blog

What is Servet ?

A servlet is a java class that extends an application hosted on a web server. Handles the HTTP request-response process (for our purposes) Often thought of as an applet that runs on a server. Provides a component base architecture for web development, using the Java Platform The foundation for Java Server Pages (JSP). Alternative to CGI scripting and platform specific server side applications.
Post a Comment
Read more

Panels in AWT

Panels: import java.applet.*; import java.awt.*; /*<applet code="PanelDemo" width=300 height=300></applet>*/ public class PanelDemo extends Applet { public void  init() { setLayout(new BorderLayout()); Panel pn=new Panel(); Button b1=new Button("Button 1"); pn.add(b1); Button b2=new Button("Button 2"); pn.add(b2); add(pn,"North"); Panel pe=new Panel(); Button b3=new Button("Button 3"); pe.add(b3); add(pe,"East"); Panel pw=new Panel(); Button b4=new Button("Button 4"); pw.add(b4); add(pw,"West"); Panel ps=new Panel(); Button b5=new Button("Button 5"); ps.add(b5); Button b6=new Button("Button 6"); ps.add(b6); add(ps,"South"); } }
Post a Comment
Read more