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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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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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When will we go for abstract class and when will we go for interface?
Praveen Kumar Singh
- Mar 13th, 2012
When you have some methods to be implemented as common and some methods you want to keep abstract, that time we will go for abstract class. You want to provide contract between class and object. And you don't want to implement any method as common that time we will go for interface.
sampra
- Mar 6th, 2012
Correct ans would be:Whenever there is need of having same common features among all subclasses of super class, we have to go for an abstract class.
Whenever there is no common features for subclasses of super class, we have to go for an interface.
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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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What is the difference between an object and an instance? And give me a real time example to differentiate these two?
Sarje
- Aug 15th, 2009
object and instance both are sameI think you want know the difference between reference and object.If so thenreference of any class type is a variable that can hold the reference(more or less we can s...
pravinsharma
- Oct 15th, 2008
An object is part of a process/thread which demands processor time through the JVM.The act of creating the object from a class is called instantiation.In literary sense an instance is existance/occurrence of an object.In this case a duplicate copy(instance) of an object is still the same object.
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Explain working of Java Virtual Machine (JVM)
nishant.mca2010
- Dec 17th, 2010
Java Virtual Machine is the heart of entire java program execution process. It is?responsible?for taking the .class file and converting each byte code instruction into the machine language instruct...
ramakrishnankt
- Apr 20th, 2009
* Creation of bytecode* Verifying the byte code* Linking the code with?library* Maintaining garbage collection
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In Execption handling What is exactly difference between throws and throw?
Karuna Reddy
- Jun 1st, 2008
Throw: We can use our own exceptions ie User Defined Exceptions.Throws: we can raise the exceptions more than one at a time
vinaymudgil007
- May 29th, 2008
Throw -- used to throw an exception explicitlyThorws -- indiacates the calling method that the called method my throw specified exceptionVinny
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Let say there are two interfaces like the followinginterface int1{int meth1();}interface int22{int meth1();}ok theni am implementing both of them in a calss as followsclass mycl implements int1,int2{}now as the rule says, if a class implements an interface it must complete its signature.now my questions is that if i define meth1(), as that method is in both interface, may i know how can i define both of that methods.please answer me
sujatham
- Aug 12th, 2007
Yes?.? int meth1()?in?both interfaces share the same implementataion in the class.
sandhya
- Apr 1st, 2007
Hi !???yes! I have chcd the above program and not giving any errors in the sense that we can use the same method in the two diff interfaces but the implementation is in the main class so this will really work ! and the expected output is printed
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What is difference between & and && in java
nehagarg2822
- Jun 1st, 2011
It depends on the type of the arguments:- For integer arguments, the single ampersand ("&")is the "bit-wise AND" operator. The double ampersand ("&&") does not mean anything as it is not defined f...
raju g
- Mar 24th, 2011
The Boolean && operator is used for determining two relational expressions and returns true if only if both returns true, otherwise returns falseThe Boolean & operator is used to perform B...
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What does the System, out, means in this statement System.out.println()?
sampra
- Mar 13th, 2012
Ystem class has a varible out 9public final static PrintStream out)and PrintStreem has a method println
Ramanjaneyulu
- Sep 3rd, 2011
println() is a method to print the messages on the screen and it is present in printStream class to access this method we need to create object of printStream class the object of printstream class cre...
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Explain Servlet and JSP life cycle
nalindascjp
- Mar 4th, 2010
A Servlet is a Java class which faclitates a web developer to write dynemic web pages. JSP is the presentation componant that used with Servlets to make a page dynamic. Generally a JSP is a HTML docum...
sripatnaiky
- Feb 4th, 2010
Life cycles are pretty same, as the JSP will be translated into a servlet during the translation phase, the important point to be considered here is if we include another JSP by making use o...
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How is serialization implemented in Java
Rajesh G
- Aug 3rd, 2007
Serialization is the mechanism of converting the state of an object to stream of bytes to a persistant storage area(file). By making an object serializable we are making the object as network enabled.Rajesh
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IBM Interview Questions in Bangalore
Br />1.what is oracle.2.what is major differenece oracle8i and oracle9i.4.tell me some thing ur self.5.please tell me about oops.6.what is single inheritance.7.what is multiple inheritance.8.can java support multiple inheritance.9.what is interface.10.what is differenec between abstract class and interface.11.how to u prove that abstrace class cannot instantiate directly.12.what is differenece between...
sujain
- Aug 17th, 2010
5. About OOPS: Object Oriented Programming is based on three major concepts: Inheritance, Polymorphism and Encapsulation Inheritance: Through inheritance the base class properties are acquired in subc...
anithananduri
- Aug 28th, 2009
8.can java support multiple inheritance.java support multiple inheritance for interfaces not fro classes25.what is difference between procedure and functions.function returns only one value where as procedure returns more than one value
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Explain the importance of "static"keyword
sampra
- Mar 6th, 2008
Static menthods, variables or block is executed in the order they are written in the class while class is getting loaded. Static methods are variables can be invoked without creating an object of the ...
vishalchat
- Feb 23rd, 2008
Static menthods, variables or block is executed in the order they are written in the class while class is getting loaded. Static methods are variables can be invoked without creating an object of the class. There is only one instance of the variable in the JVM.
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What will this printint i=10000System.out.println(i*i);and explain why ?
I do't know
vasu.funky
- Oct 7th, 2007
It will give you the multiplied value..does not throw an error..we are no way storing this result (i mean you are not storing thisvalue in any interger or so...) it is just displayed in the sop which expects a string value
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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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What is difference between array & arraylist?
Arraylist is resizable where as using array it is not possible.
Sukhrob
- Dec 24th, 2015
First difference: array is already with fixed size while array lists size could be dynamically changed.
Secondly, array can include only the same type of data while array list can consist of different primitive data types as well as objects.rakesh
- Nov 18th, 2015
Array is collection of similar data type values. We cant resizable and growable of array. It is already fixed when you declared while array list works as a dynamic in which size could be grow. It is a part of collection framework to handle or store the collection of object not any type of values.
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What is garbage collection? can it be forced?
Karuna Reddy
- Jun 6th, 2008
Garbage Collection: If no longer any obejct need to any variable, java automatically reclaimes the memory.U can't force the GC, U have to give the request by using system.gc() and even not guarante that its immediatly to reclaims the memory...........
vinaymudgil007
- Jun 5th, 2008
garbage collection means releasing the memory free from the objects that can no longer be refferenced.No it can't be forced.............. although system.gc() or whatever may request for garbage collection but when exactly it would be started is at the discretion of JVM.
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Why Java is secured compare with other languages? Explain with example.
prachi patil
- Oct 24th, 2016
Java: The Most Secure Programming Language? What makes Java the most secure programming language? Or is it really so? We will discuss the same in this blog. If you wish to make a career in Java progr...
aleemkh
- Jul 29th, 2008
Before talking about secure , let us compare the difference between C and Java.First a C program is coverted as shown belowC(sourcecode) --> compiler---> compiles to binary (101010)---> OperatingSyste...
Core Java Interview Questions
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