The Collections of Objects

Jerry   August 13, 2015   Comments Off on The Collections of Objects

StackVsHeap

Here is a section that will particularly please you. We will see that we are not obliged to store our data in tables! These famous collections of objects are also dynamic: basically, they do not have a set size. It is therefore impossible to exceed their capacity!

I do not pass through all types and all objects Collection because they are many, but we will see the main ones. The objects we’ll cover here are all in the package java.util . Easy to remember, right?

This chapter will be of great use because the collections are essential in Java programs and they define an important part of answering the question of what is java.

The different types of collections

Before presenting some objects, I propose to introduce the component hierarchy of interfaces called collections. Yes, you read that right, it is indeed interfaces: they encapsulate most of the methods used with all concrete implementations. Here’s a small class diagram in the following figure schematizing this hierarchy.

java

You can see there are many types of collections, the interfaces List and Set directly implement the interface Collection and the interface Map revolves around this hierarchy, while being part of the Java collections.

Reading the rest of this chapter, you will find that these interfaces have features corresponding to specific needs. Objects of type List is used to store objects without special conditions on how to store them. They accept all values, even values ​​null . Types Set are a bit more restrictive since they do not allow twice the same value (same object), which is convenient for a list of unique items, for example. The Map are unique because they work with a key system – value to store and find the objects they contain.

Now that I have briefly explained the differences between these types, see how to use these objects.

The List Objects

The objects belonging to the category list are, in short, expandable tables at will. It includes objectsVector , LinkedList and ArrayList . You can insert as many items as you want without fear of exceeding the size of your table. They all work the same way: you can recover the items in the list via their indices. In addition, the list contains objects. I suggest you see two objects of this type that I think will be very useful.

The object LinkedList

A linked list (LinkedList in English) is a list in which each element is linked to the adjacent elements by a reference to the latter. Each element contains a reference to the previous item and the next item, except the first, which the previous item is null , and the last, the next element which is also null .

The following figure shows a diagram one that allows you to represent you better operation of this item:

java programming

 

Here’s some code to support my statements:

import java .useful .LinkedList ;import java.util.List;import java .useful .ListIterator ; public class Test  {   public static void main(String[] args) {    List l = new LinkedList();    l.add(12);    l.add("toto ! !");    l.add(12.20f);     for(int i = 0; i < l.size(); i++)      System.out.println("Élément à l'index " + i + " = " + l.get(i));  }}

If you try this code, you will find that all the elements are displayed!

There is something else you need to know about this type of object: they implement the interfaceIterator . So we can use this interface to list our LinkedList .

An iterator is an object that has the role to browse a collection. This is also his only reason for being. To be precise, the use of iterators in Java works the same way as the pattern of the same name. Just as we saw with the strategy pattern , the design patterns are actually objects of design models for better stability and increased reusability. Iterators are included.

In the following code, I added the course with an iterator:

import java .useful .LinkedList ;import java.util.List;import java .useful .ListIterator ; public class Test  {   public static void main(String[] args) {    List l = new LinkedList();    l.add(12);    l.add("toto ! !");    l.add(12.20f);     for(int i = 0; i < l.size(); i++)      System.out.println("Élément à l'index " + i + " = " + l.get(i));       System.out.println("\n \tParcours avec un itérateur ");      System.out.println("-----------------------------------");      ListIterator li = l.listIterator();       while(li.hasNext())        System.out.println(li.next());  }}

The two approaches are similar!

Note that I have to tell you something about the linked list: since all elements contain a reference to the next element, such lists may become particularly severe growing! However, they are suitable when you have a lot to handle a collection by deleting or adding objects to the list environment. They are so use with caution.

The object ArrayList

Here’s a handy object. ArrayList is one of those objects that have no size limit and, in addition, accept any type of data, including null ! We can put anything we want in an ArrayList , here is a piece of code that shows:

import java .useful .ArrayList ; public class Test  {   public static void main(String[] args) {             ArrayList al = new ArrayList();    al.add(12);    al .add ("A string!" );    al.add(12.20f);    al.add('d');                    for(int i = 0; i < al.size(); i++)    {      System.out.println("donnée à l'indice " + i + " = " + al.get(i));    }                 }}

If you run this code, you will get the following figure.

java features

I think you can already see the benefits of ArrayList .
Also note that there is a whole range of methods provided with this item:

  • add () adds an element;
  • get (int index) returns the item to the requested index;
  • remove (int index) clears the entrance to the requested index;
  • isEmpty () returns “true” if the object is empty;
  • removeAll () erases all contents of the article;
  • contains (Object element) returns “true” if the element passed in parameter is in theArrayList .

Unlike LinkedList , the ArrayList is fast read, even with a large volume of objects. However, they are slower if you need to add or remove data in the middle list. In summary in the extreme, if you do a lot of reading without worrying about the order of items, use a ArrayList ; However, if you insert a lot of data in the middle of the list, go for a LinkedList .

 

How to hide folder in windows 98, xp, 7, 8 , 8 1, 9 ,10 using command prompt

Jerry   February 5, 2016   Comments Off on How to hide folder in windows 98, xp, 7, 8 , 8 1, 9 ,10 using command prompt


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Eclipse is much more than just an IDE!

Jerry   February 4, 2016   Comments Off on Eclipse is much more than just an IDE!


Every year, the Eclipse simultaneous release brings together the hard work of dozens of open source projects into a single coordinated release. Most people think of Eclipse as a Java IDE; for the IDE crowd, this year’s Mars release introduces changes in the look and feel of Eclipse, improved Java 8 support, enhanced content assist, and more. In this session, we’ll walk through some of the new IDE features and survey some of the other technology being developed by open source projects at Eclipse. But Eclipse is also much more than an IDE. Repeat after me: “Eclipse is much more than just an IDE! Eclipse has a lot of cool projects that can get me started with the Internet of Things!”. So whether or not you are using Eclipse as your IDE, the second half of this session will give you a crash course on the available technologies to build the Internet of Things on top of Java. You will learn how protocols like MQTT, CoAP or LwM2M and embedded frameworks like Kura help solve classical IoT issues, and you will get useful tips to move from “yay, I blinked an LED!” to more useful industrial IoT scenarios.

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Open Source guy in a wireless company |
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Wayne is the Director of Open Source Projects at the Eclipse Foundation. He spends his days working with the many Eclipse projects, learning about Eclipse technology, and making sure that everybody knows just how cool it all really is. When not working, he can usually be found watching his kids play hockey at one of the many local arenas.

How to hide folder in windows 98, xp, 7, 8 , 8 1, 9 ,10 using command prompt

Jerry   February 2, 2016   Comments Off on How to hide folder in windows 98, xp, 7, 8 , 8 1, 9 ,10 using command prompt


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7 tips how to be an awesome programmer

Jerry   January 31, 2016   Comments Off on 7 tips how to be an awesome programmer


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Java Tip of the Week #4 – Lambdas

Jerry   January 30, 2016   Comments Off on Java Tip of the Week #4 – Lambdas


The Java Tip of the Week, is a series of small videos that shows you useful Java tips. The #4 is about Java 8 Lambdas.
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Tutorial Para Seba [Descargar Java 32 y 64 Bits para Minecraft] Full-Español

Jerry   January 29, 2016   Comments Off on Tutorial Para Seba [Descargar Java 32 y 64 Bits para Minecraft] Full-Español


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The Big Picture Photography | Funky Picture Photography | Photography Tips

Jerry   January 28, 2016   Comments Off on The Big Picture Photography | Funky Picture Photography | Photography Tips


Watch The Big Picture Photography Competition Round 382 Funky Picture Photography Photography Tips

1.This week’s The Big Picture winner – and recipient of a Nikon D3300 camera, worth £490 – is Ray Hems, of Newbury, Berkshire, with an image of an albatross flying past an iceberg in Antarctica.
Scroll through the gallery to see this week’s other shortlisted entries.

Picture: Ray Hems

2.A flock of red-winged blackbirds in New Mexico, US
Steve Horsted of Luton
Picture: Steve Horsted

3.A moment of solitude at the Taj Mahal in India
Guy Brown of Guernsey, Channel Islands
Picture: Guy Brown

4.Pine martens playing in the snow in North America
Alastair Swan of South Ayrshire
Picture: Alastair Swan

5.The Royal Pavilion in Brighton
Jide Adeleye of Brighton
Picture: Jide Adeleye

6.Mount Bromo in Java, Indonesia
Jason Tan of Glasgow
Picture: Jason Tan

7.Cathedral Rock in Sedona, Arizona
David Curry
Picture: David Curry

8.The backstreets of Lyon, France
Brian Minkoff of London
Picture: Brian Minkoff

9.And finally…
Early morning on a beach in Burma
Theresa Werner
The Big Picture: previous winners and how to enter
The Big Picture: terms and conditions of entry
More travel picture galleries
Picture: Theresa Werner

Lenovo K4 Note Unboxing And Overview!

Jerry   January 26, 2016   Comments Off on Lenovo K4 Note Unboxing And Overview!


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SIM Dual SIM (Micro-SIM, dual stand-by)
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Resolution 1080 x 1920 pixels (~401 ppi pixel density)
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CPU Octa-core 1.3 GHz Cortex-A53
GPU Mali-T720MP3
Memory Card slot microSD, up to 128 GB
Internal 16 GB, 3 GB RAM – A7010 a48
8/16/32 GB, 2 GB RAM – A7010
Camera Primary 13 MP, f/2.2, phase detection autofocus, dual-LED (dual tone) flash
Features Geo-tagging, touch focus, face detection, HDR, panorama
Video 1080p@30fps
Secondary 5 MP
Sound Alert types Vibration; MP3, WAV ringtones
Loudspeaker Yes, with stereo speakers
3.5mm jack Yes
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Comms WLAN Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, hotspot
Bluetooth v4.0, A2DP, LE
GPS Yes, with A-GPS
NFC NFC
Radio FM radio
USB microUSB v2.0
Features Sensors Fingerprint, accelerometer, gyro, proximity, compass
Messaging SMS(threaded view), MMS, Email, Push Mail, IM
Browser HTML5
Java No
– Active noise cancellation with dedicated mic
– MP4/H.264 player
– MP3/WAV/eAAC+/FLAC player
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– Document viewer
Battery Non-removable Li-Po 3300 mAh battery
Stand-by Up to 265 h (3G)
Talk time Up to 23 h (2G) / Up to 22 h (3G)
Misc Colors Black
Price group 5/10
I Personally Liked This Phone!
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PASS LIFE IN UK TEST IN 10 MINUTES

Jerry   January 25, 2016   Comments Off on PASS LIFE IN UK TEST IN 10 MINUTES


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