Core Java Interview Questions
Every year many thousand technocrats choose Java careers across the globe,after formally taking Java training classes,courses a...
Showing posts with label Core Java. Show all posts
Showing posts with label Core Java. Show all posts
Miscellaneous Core Java Questions With Short Answers
In a Java program, how can you divert program messages to the system console, but error messages, say to a file? A. The class 'Syste...
Collection APIs Related Interview Questions
You may like to read following posts before going through the list of questions mentioned on Collections APIs in this post: Questions on jav...
Short Questions On Java
Q.If I am extracting data from database which is have redundancy and not sorted, which collection object will you choose in order to make th...
Give an example where upcasting takes advantage of polymorphism.
Here it goes: class Parent { } class Child extends Parent { } Child can be referred as an object of type Parent or Child. Upcasting works li...
Interview Questions on java.net.*
How can you display a particular web page from an applet? How can you get the hostname on the basis of IP addres ? How can you get an I...
What are different socket options?
The different Socket options are : SO_TIMEOUT SO_LINGER TCP_NODELAY SO_RCVBUF SO_SNDBUF. They may be specified in various scenarios ...
How can you get the hostname on the basis of IP addres ?
The following snippet of code helps you in finding hostname on the basis of IP address:- InetAddress inetAddress = InetAddress.getByNam...
How do you know who is accessing your server?
In case of TCP protocol i.e. ServerSocket : Each Socket connection accepted corresponds to who is connecting to your server, that means rel...
What should I use a ServerSocket or DatagramSocket in my applications?
DatagramSocket accepts only UDP packets, whereas ServerSocket allows TCP connections in an application. It depends on the protocol one imple...
How can you display a particular web page from an applet?
The following code snippet shows you how to achieve that using showPage method is capable of displaying any URL passed to it. import java.n...
How is JDO(Java Data Object) different from VO(Value Object) ?
JDO is - a persistence technology -allows you to create POJOs (plain old java objects) and persist them to the database . Value objects ...
Questions on Assertions
What is an Assertion and why using assertion in your program is a good idea ? Explain Assertions with a code exmaple. How many forms of ...
What situations are best suitable for implementing assertions?
Assertions can best be implemented : - As Internal Invariants - As Control flow Invariants - As Preconditions and Postconditions - As Class...
When assertions should be avoided?
In following situations the assertions should be avoided: -When assertion becomes a performance issue.It means an assertion should not incl...
Explain Assertions with a code example
The main reason of introducing assertions in Java from R1.4 onwards is to reduce the chances of bugs which otherwise would have gone unnotic...
How many forms of assertions we have?
There are two forms of assertions: The first, simpler form is: assert Expression1 ; where Expression1 is a boolean expression. When the sy...
What is an Assertion and why using assertion in your program is a good idea ?
In a Java program,several times, one would like to make certain assumptions for executing a program.For example,while taking a square root o...
What is difference between trusted and untrusted applet?
A trusted applet is one which signed by a trusted authority. The trusted applet is installed on the local hard disk, in a directory on the ...
What is the difference between Java class and bean?
What differentiates Beans from typical Java classes is introspection. The tools that recognize predefined patterns in method signatures and ...
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