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  

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• Member Since Apr-2010 | Jun 13th, 2010

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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

 Profile Answers by jamesjohnney Questions by 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

 Profile Answers by Anubhavs Questions by 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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What is the difference between below 2 statements? String s1=new String("abc");String s2="abc";How it will allocate in memory?

gaurav

• Jun 15th, 2012

in String s1 = "Hello World"; // "Hello world" is a constant and it will be allocated in the string pool. all the variables refering to "Hello World" constant will refer to same memory location in th...

sampra

 Profile Answers by sampra Questions by sampra

• Mar 13th, 2012

String s1=new String("abc");- creates 2 obj one in jvm and one in pool.

String s2="abc"; no obj will create it will point to pool above already created existing obj

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In how many ways we can create an object? Explain with example.

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vishrutha  

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• Member Since Feb-2009 | Feb 13th, 2009

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1. Using new keyword
This is the most common way to create an object in java. I read somewhere that almost 99% of objects are created in this way.

MyObject object = new MyObject();

2. Using Class.forName()
If we know the name of the class & if it has a public default constructor we can create an object in this way.

MyObject object = (MyObject) Class.forName("subin.rnd.MyObject").newInstance();

3. Using clone()
The clone() can be used to create a copy of an existing object.

MyObject anotherObject = new MyObject();
MyObject object = anotherObject.clone();

4. Using object deserialization
Object deserialization is nothing but creating an object from its serialized form.

ObjectInputStream inStream = new ObjectInputStream(anInputStream );
MyObject object = (MyObject) inStream.readObject();

5. Using class loader
one more is through creation of object using classloader like

this.getClass().getClassLoader().loadClass(”com.amar.myobject”).newInstance();

Now you know how to create an object. But its advised to create objects only when it is necessary to do so.

sampra

 Profile Answers by sampra Questions by sampra

• Mar 13th, 2012

There are 5 ways:
1-> new operaotor
2-> Class.forName()
3-> Cloning
4-> Deserialization
5-> Class.newInstance()

Max

• Sep 7th, 2011

All sorts of syntax sugar can also be named: 6. New String as a result of concatenation: String varName = getClass().getName(); //to avoid compile-time optimization String a = "Prefix" + varName; ...

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bharath.334

 Profile Answers by bharath.334 Questions by bharath.334

• Feb 24th, 2010

As far of my knowledge grid view is used in CRUD (Create, View, Update and Delete) applications so in CRUD it is better to go for AJAX insted of going for other controls/requests.

biswaranjanrout

 Profile Answers by biswaranjanrout Questions by biswaranjanrout

• Feb 14th, 2008

If it is required the updation in data base should be display instanctly to the user every time then   ajax is  better to use ,otherwise it is not required.

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AMIT GURJAR

• Sep 21st, 2012

Sir please tell me that when a thread never return desired result then why we use it?

prabakaran29

 Profile Answers by prabakaran29 Questions by prabakaran29

• Aug 19th, 2012

Thread class can be extend only one class where as we using runnable interface can be implement many classes.so runnable interface is the best to implement the block of code

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