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Why servlet context is used but not ServletConfig
What is use of the servletconfig
josesaid
- Jul 27th, 2011
The ServletContext is the way to comminucate with the whole application, and the servletconfig is to communicate just with the actual servlet... Greetings..."java5 this.getServletC...
vinodk.05
- Jul 27th, 2011
ServletContex is used to hold information required through out application. One object created for per application and remain active until server is up. while servlet config is used to hold informatio...
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Which one is faster interms of accessing, interface or abstract class?
narendra
- Jul 28th, 2011
No, Suppose both have abstract method then ?
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What is the purpose of interface? And tell the difference between the class and interface?
sachin
- Aug 2nd, 2011
interface is mainly used to achieve standardization and loose coupling.. Its like a media between two systems. Interface can be treated like rules, where only method definition is present but not imp...
surya_merla
- Jun 7th, 2009
An interface is a specification of method prototypes. All the methods of interface are public and abstract. They are public because they should be available to third party vendors and they are abstrac...
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How does an object knows if some change happens in its base class?
For example:
Class A created with method m1() and its object created in various other files. later m1() changed to m2() and class has added some more public variable. Now question is how does object created in other files came to know about this change happened in its class.
Is Object Listener linked to this question??? -
Java.lang.object class methods
List out the five common methods in java.lang.object class?
Prabhat807
- Aug 20th, 2011
Public native int hashCode()
public string toString()
public final void wait()
public final native void notify()
public final native void notifyAll()
public boolean equals(object)
protected void finalize() -
How would you implement a thread pool
phanibhushan.g
- Apr 6th, 2010
Two ways of implementing your own thread pool. a. Using the java.util.concurrent.Executors class which contains the static methods newFixedThreadPool(), newCachedThreadPool() etc for creating thread p...
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String s2="xyz";
String s3=new String("abcd");
totally how many objects will be created?
">In the declaration of strings, String s1="abc"; String s2="xyz"; String s3=new String("abcd");totally how many objects will be created?
nik7i
- Aug 28th, 2011
There are 3 objects created
According to syntax
string s1= new string("abcd")
syntax create an object of string
hence there are 3 object -
How can we take various inputs from user as int,char,string,float etc ?
dinesh
- Oct 12th, 2011
Example we get input for integer,
Scanner scan = new Scanner(System.in);
int variable_name = scan.nextInt();geeksterrahul
- Jul 25th, 2009
Firstly take the User input as String using the BufferedReader API.Call br.readLine();Once you get the input Use .ValueOf method for conversion. Eg: String MyString; Buffere...
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Inter Thread Communication
What are all the methods used for Inter Thread communication and what is the class in which these methods are defined?
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Editorial / Best Answer
maneesh.ce.2007- Member Since Nov-2008 | Dec 15th, 2008
There are three ways in which Threads communicate with each other :
wait: It tells the calling thread to give up the monitor until some other thread enters the same monitor an calls Notify or Notifyall...
notify: It wakes up the first thread that called Wait() on the same object...
NotifyAll: It allows all the threads that called Wait() on the same object.The thread having the highest priority will run first...chakry
- Nov 5th, 2011
Why we use 'wait()' inside a synchronized method
kutiarul
- Nov 21st, 2009
Three methods are used. They are1. wait() - makes one thread wait for some time till another thread is being executed2. notify() - makes one wait process into ready state process3. notifyall() - makes all the waiting processes into ready state processes
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How can you do multiple inheritance in Java
sony
- Nov 27th, 2011
Its not possible directly. That means this feature is not provided by Java, but it can be achieved with the help of Interface. By implementing more than one interface
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Dynamic Polymorphism
Write a program for dynamic polymorphism without using method overriding?
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What is Java Reflection.?2. For what are triggers used in a database.
koti.tirumala
- Jan 5th, 2012
Using Reflection API, We can know the runtime beheaviour of class.
Using this we can identify the methods,constractors and return types.
Note: If we know class name we can create object using new operator and will call methods. If we dont know the className then we will go for reflection API.Rahul sharma
- Oct 11th, 2011
Reflection is API to find out the detail of the class at run time....
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What do you like most with Ant
koti.tirumala
- Jan 5th, 2012
Memory leaks are caused by writting poor program design where Object reference are long lived and the garbage collector is unable to reclaim those objects..
javagek
- Aug 27th, 2011
I guess the best thing about ANT is that it's easier to learn and works cross platform and cross programming language - which is a real bonus.
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Final method
having said a final method can be overloaded(default in d same class) plz explain me if there is anything missing in this code ?
class Base {
public final doSomething(Object o) {
System.out.println("Object");
}
}
class Derived extends Base {
public doSomething(Integer i) {
System.out.println("Int");santhosh
- Feb 23rd, 2012
In the main method,you simply change the "base d" as "Derived d" you get "object" and "int" as a output.also returned type is required.
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What is difference between instance and object.?what are the all difference between interface and abstract class?
heena
- Feb 15th, 2012
Object is a instance of a class. Instance is the occurence of the object of class which defines its state and behavior.
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Exception
When super class method throws exception then subclass also throws the same Exception, which will compile?
alin20_84
- Feb 14th, 2012
Here foo can skip adding throws NullPointerException because is an unchecked exception
class SupSub extends Super {
void foo()throws NullPointerException
{
System.out.println("SupSub");
}
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Abstract body
can we declare abstract body ? Explain with simple example and the situation you would use ?
krishna
- Jan 19th, 2012
Here, a ; (semicolon) is given after the method header of the first display method (with parameter). And for the second display method, keyword abstract is not stated in the header and it doesn?...
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What is the difference between transient variable,volatile variable
sampra
- Mar 6th, 2012
transient variable is the variable which cant be serialized..volatile is useful in multi thread env.each thread has ots own copy to update..in fact it wont update the main memory var ..its update the ...
Sanjeev
- Jan 25th, 2012
If you are working with the multi-threaded programming, the volatile keyword will be more useful. When multiple threads using the same variable, each thread will have its own copy of the local cache f...
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Is is true that JAVA is not 100% object oriented language ?
Core Java Interview Questions
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