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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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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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Arrays/Linked List
When and on what conditions will you decide whether to use linked lists or arrays, also Which process is fastest and which is slowest in arrays as well as linked list i.e, sorting, searching, add, delete etc.
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Aqan12- Member Since Apr-2010 | Jun 13th, 2010
Memory:
When you create an array you allocate all the memory while initializing the array, so if you had an array of 1000 Objects, you'd allocate space to hold 1000 object references as soon as you initialize the array.LinkedList on the other hand extends dynamically as the objects are added to the linked list.
Accessing Elements:
Arrays are useful if you are going to access elements using the index. if you need to access the 100th element you can directly access it by a[100].To access 100th element in a LinkedList you'll have to traverse 99 elements to reach the 100th element.
LinkedList can handle addition/deletion of elements better then arrays and that's one of the most powerful feature of LL over arrays.
Adding/Inserting Elements:
Array is fixed size; to add a number of elements greater then the size of the array you'd have to copy the array into a new bigger array.To insert an element in the middle of an array all the elements after the inserted element would have to moved up one index.
LinkedList can grow dynamically.
Deleting Elements:
To delete an element from Array you'd have to move down all the elements after the deleted element.LinkedList elements can be deleted dynamically.
To summarize, LinkedList can handle manipulation of data structure much better and efficiently manage memory but arrays have better accessibility when accessing elements by index.
Search and Sort would be similar performance on both.jamesjohnney
- Aug 12th, 2010
In all way Linked list is best then Arrays, since its a next level of Array 1. Linked list is dynamic allocation where as Arrays are not 2. We can get and set the value with the use of get, set method...
Anubhavs
- Aug 6th, 2010
Linked list is best under the feature of the manipulation e.g. insertion, deletion etc. In the other way the array will go through a good way if we focus on the accessibility.
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Marker Interface
When there is no methods in the marker interface, then what is the use of marker interface. What is the functionality of the interface. Why do we need to implement marker interface?
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Saroj_mi2- Member Since Sep-2009 | Sep 14th, 2009
Marker interface is an interface with out having any implementation methods.
By implementing this interfaces, we will specify some special behaviour to implemented class.
Examples: Serializable, Cloneable
For example if we want to create a clone for a an object of class using clone()(clone()-- which is an object class method), then class need to implement Cloneable interface.
This mark is to JVM to handle the interface.If you are implimenting this interface the compliler will know some specific job need to be done.
For Cloneable interface even it does not have any methode the JVM looks for clone() method to execute. But the complier will not fail if the clone() meth is not implimented.
Narotam
- Jan 19th, 2010
Marker interface do not have any method. It is used only to inform JVM that?such class can do some special function like clone, serialize.
uncer
- Jan 15th, 2010
When you need to perform some behavioral function on any class without implementing method in implemented interface we implement an interface such interface called marker interface for exmple serializabe, cloneable.
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ReadLine() Function
Explain readLine function in Core Java.
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omkar.raj- Member Since Jul-2010 | Jul 8th, 2010
ReadLine() function is used to take the input from user in string format.
muralidhar.9e
- Sep 8th, 2010
Actually the readLine() method will reads the data through the bufferdReader object. It reads only one line of data through keyboard. We can't enter the multiple lines of data at runtime.This is the main functionality of the readLine() method.
sailendra.n.jena
- Aug 26th, 2010
It will read the data from the keyboard but line by line not character by character.
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Will there be a performance penalty if you make a method synchronized? If so, can you make any design changes to improve the performance
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Answered by: Faisal Ghauri
- Jul 24th, 2005
Performance does take a hit when using synchronization. I think the way to reduce this hit is to synchronize only a block of code that will be accessed by threads and not synchronize the entire method.
sumeesudha
- Feb 6th, 2010
There is degradation in performance when you make a method synchronized. Even when a program contains only a single thread running on a single processor, a synchronized method call is still slow...
sripatnaiky
- Feb 4th, 2010
The Synchronization may be useful in avoiding the deadlock, helpful in maintaining the consistent object state etc,. Only one thread will be accessed at a time by acquiring lock on the synchronized bl...
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Which one is better when compare with Interface and Abstract class ?
muralidhar.9e
- Oct 30th, 2010
I prefer to Interface. Because the same feature can have different implementations in different Objects.And can also support for multiple Inheritance through Interfaces.If you go for Abstarct Classes ...
salman138
- Oct 29th, 2010
Both Interface and Abstract class have different usages. Interface is used to define that an object support a certain kind of functionality like any class that implements Comparable interface has the ...
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Can array with zero length exist in Java?
swapnil
- Sep 17th, 2013
Yes, array size in java is always 0 bz array is start with 0th location
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How to catch an Error occurred in a class
Can we catch an Error occurred in a class by extending that class with Throwable Since, Exception and error is the sub class of throwable.If yes/no- why?
sampra
- Feb 20th, 2008
We can handle the exception but we cabt handle error super call of both is throwable
onelastman
- Jan 8th, 2008
yes...u can handle that error by extending with our class with throwable...but it is not recommended to do...pls don't consider errors as same to the exceptions..both are different...Errors ...
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Serialization Process
Explain the use of serialization process in real time projects?
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Sarje- Member Since Aug-2009 | Aug 28th, 2009
Serialization is the process of writing the state of an object to a byte stream. This is useful when you want to save the state of the object (content of the object) to a persistent storage area, such a file.
For example if you want to maintain record of the temprature on a particular place at every hour then you can serialize your object and save the temprature at every hour in a file.
Only an object that implements the java.io.Serializable interface can be saved.dh_maan
- Jun 6th, 2010
The use of serialization process in real time project is to transfer the object over the network.
winoth4
- Oct 28th, 2009
Serialization is writing the state of the object to a byte stream. This is useful when you want to save the state of the object in a persistent ?storage such as file.
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Adding Method in Java
Hi
I have interface in that interface 3 methods are there , after some days client said that,i want to add one more method in that interface ,so how can add 4 method so that the implemented class did not affect,
Thanks
Kalins Naik
sivapurammani
- Jul 4th, 2013
If we implement any new method in Interface then by default that method is public and abstract, So the classes which are implementing that interface should implement that method that is one way in whi...
akii
- Apr 30th, 2013
Make a class abstract in this class you do not need to implement all methods of interface .
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Platform Independence
Why platform independence is needed in real world ?
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What is difference between string and stringtokenizer?
prasanna_b2001@yahoo.com
- Dec 16th, 2005
String and stringtokenizer serves different string operations. there is no point in comparing these two.
katam
- Nov 14th, 2005
stringtokeniser can devide the the string into tokens.where string is group of characters within " ">
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Difference between throw and throws
What exactly is the difference between between throw and throws? If both are used for the same purpose then why are both needed instead of one?
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vegetto- Member Since Jun-2008 | Jun 15th, 2008
hi there,
throw:the throw keyword is used to throw the exception manually,that is when you feel a particular line in your code, when executed is capable of having some exception then you use throw keyword as:
throw new MyException(arguments if any);
this leads to instantiating of the MyException class and exception is thrown
throws: this is to be used when you are not using the try catch statement in your code but you know that this particular class is capable of throwing so and so exception(only checked exceptions).in this you do not use try catch block but write using the throw clause at appropriate point in you code and the exception is thrown to caller of the method and is handeled by it. eg:
void trouble()throws IOException,any other exceptions just separate them with commas.......
{
/* throw statement at appropriate step,
no need to use try catch here,exception would be thrown to caller and u should provide try catch block to handle exception there else this process cotinues further till
appropriately it is handeled or prog terminates abruptly */
}
this is called as HANDLE OR DECLARE RULE i.e either u handle exceptions using try catch block or by declaring them
vegetto
- Jun 15th, 2008
hi there, throw:the throw keyword is used to throw the exception manually,that is when you feel a particular line in your ...
krishna_kanth83
- Jun 14th, 2008
they are not same."throws" declares that your method is capable of throwing an exception."throw" actually does the work , of throwing the exception.example :public void...
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MVC architecture
what is the difference between MVC1 & MVC2 in Java?
sivapurammani
- Jul 10th, 2013
MVC(Model-View-Controller) :: This type of architecture makes our code to be reusable and separation of code. View :: Which presents the modal data, example if we are presenting any tabular data or c...
Prasad MN
- Mar 11th, 2013
MVC1: Its a model view Controller architecture 1 that means all the presentation logic and business logic is mixed up. If any modification is required on its impact on the logic. Difficult ...
Core Java Interview Questions
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