What are objects in programming languages?

Our world is made of objects. Every living and non-living thing can be refereed to as an object.  Human, car, dog, chair, table, money are just a few examples of real world objects. All real world objects have two main characteristics.

• State
• Behavior

State is also can be refereed to as a property. A dog has properties like color, breed, name  and height. By looking at the object you can identify these properties. A dog has behaviors such as running, eating, barking and sleeping. Behaviors are things that dog can do (perform). Therefore behaviors are also can be defined as actions that a particular  object can do.

Another example, think about the light bulb. Light bulb has properties such as color, on and off. Also it has behaviors such as turn-off and turn-on.

Objects we find in a software are also similar to objects in real world. They also have states and behaviors. The state of an object is represented by fields (sometimes fields are refereed to variables). Behaviors of an object are represented by methods. Methods are the key fundamental item which perform action in a software.

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Creating Java programs using Eclipse IDE

First you need to download Eclipse IDE from eclipse.org web site. Then you can unzip the downloaded zip file. Then you can run the Eclipse IDE.

Note: Before you run Eclipse, make sure you computer is equipped with Java Run time (JRE). If you don't have JRE installed in the system, you will have to install it before you run the application.

This is Eclipse interface.

You need to create a new project in Eclipse. Use following steps to create a new project.

1. Go to File > New > Java Project.

When you create a new Java Project in the workspace, Eclipse creates a special folder to hold all files of the project. Name that you type as the project name will be the name of the project folder. If you have already created a project folder, then you can select Create project from existing source and the browse for the project folder. If the default Create new project in workspace is selected, then your project folder will be created in you Eclipse workspace folder.

Next you need to select the Java Run time that you prefer to use to run your Java application.

 Click Next and then Finish to create a new Java project.

Note : After you clicked the Next button, you should see the following dialog box. In this dialog box you can change the source and output folders. It is good enough to keep the default setting for the moment.

 

You have just created a Java project. Now you can create a Java class. Use following steps to make a new Java class.

• Go to File > New > Class. This will bring a new dialog box called New Java Class.
• Enter the class name as HelloWorld. This is the name of the Java class that your are creating here.
• Make sure that the public static void main(String [] args) check box is selected. This will add the main method to your class.

Now Eclipse creates a new Java class file called HelloWorld.java. This is created in the 'Your workspace folder'/HelloWorld/src folder. Directory HelloWorld is project folder that you created before and src is the default location which stores source codes of your project.

Now you should see the code window appears with some source code in it.

 

You can enter following code in between opening and closing curly braces.

System.out.print("Hello, World!");

In order to run the program, simply go to  Run menu and select Run or click on the Run button on the toolbar.

If there are no errors on the program, you should see the running application on the Console window.

 

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Create A New Document In MS Word 2007

Creating documents in Microsoft Word 2007 is not very difficult. This video teaches you how to do it.

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Change Interface Color in Word 2007

Are you board with the same interface color in MS Office 2007. Then, you can change it to something else. watch the video and learn.

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