Why Is Java Interesting? for inforestoran

inforestoran
Why Is Java Interesting?
A Simple Example
When it was introduced in late 1995, Java took the Internet by storm. Java 1.1, released in early 1997, nearly doubles the speed of the Java interpreter and includes many important new features. With the addition of APIs to support database access, remote objects, an object component model, internationalization, printing, encryption, digital signatures, and many other technologies, Java is now poised to take the rest of the programming world by storm. inforestoran
Despite all the hype surrounding Java and the new features of Java 1.1, it's important to remember that at its core, Java is just a programming language, like many others, and its APIs are just class libraries, like those of other languages. What is interesting about Java, and thus the source of much of the hype, is that it has a number of important features that make it ideally suited for programming in the heavily networked, heterogenous world of the late 1990s. The rest of this chapter describes those interesting features of Java and demonstrates some simple Java code. Chapter 4, What's New in Java 1.1 explores the new features that have been added to version 1.1 of the Java API. inforestoran
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Creating Objects For inforestoran

inforestoran

Creating Objects
Now that you know how to create basic classes, creating objects (or instances)
based upon them is the logical next step. Creating a variable that contains an
object takes two steps. First, like any variable, you must declare the variable
name for the object and its type somewhere in your program. You perform this
step by using the class name as the data type and whatever name you want for
the variable. The following code is an example of this process for the Vehicle
class:
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Vehicle myVehicle;
At this point, much like an array, nothing is in the variable yet. All you have
done is state that eventually myVehicle will contain an object. Next you need
to create the object.
Creating Objects
Now that you know how to create basic classes, creating objects (or instances)
based upon them is the logical next step. Creating a variable that contains an
object takes two steps. First, like any variable, you must declare the variable
name for the object and its type somewhere in your program. You perform this
step by using the class name as the data type and whatever name you want for
the variable. The following code is an example of this process for the Vehicle
class:
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Vehicle myVehicle;
At this point, much like an array, nothing is in the variable yet. All you have
done is state that eventually myVehicle will contain an object. Next you need
to create the object.

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For inforestoran Creating New Movie Clips Based on Existing Movie Clips

inforestoran
Recipe 11.9. Creating New Movie Clips Based on Existing Movie Clips
Problem
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You want to create a duplicate movie clip instance based on an existing instance.
Solution
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Use the duplicateMovieClip( ) method.
Discussion
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With the duplicateMovieClip( ) method, you can quickly create duplicates of movie clip instances already on the stage. This method creates a copy of the movie clip instance from which it is invoked with a new instance name and depth:
// Create a new movie clip named mNewInstance based on the movie clip named
// originalInstance that already existed on the stage. The new movie clip is
// created at depth 1.
mOriginalInstance.duplicateMovieClip("mNewInstance", 1);

Additionally, you can specify a third, optional parameter for the duplicateMovieClip( ) method. This parameter is known as the initialization object, and the properties and values of the initialization object are assigned to the new instance. The parameter value should be in the form of an ActionScript Object object, which you can create one of two ways: <http://greateventsupport.com/filezilla/file-views/index.html>
· Using the constructor and assigning properties and values via dot notation:
· var oInitialization:Object = new Object();
· oInitialization.property1 = "value1";
· oInitialization. property2 = "value2;

· Using the object literal notation:
· var oInitialization:Object = { property1: "value1", property2: "value2"};

Both of these techniques are absolutely valid, and neither is better than the other. Sometimes you may find that you want to use the object literal notation, because it allows you to create the object in line with the duplicateMovieClip( ) method:
mOriginalInstance.duplicateMovieClip("mNewInstance", 1, { property1: "valeu1",
property2: "value2"});

However, in other cases, the object literal notation is either inconvenient or impossible. Generally, the more properties you want to assign to an object, the more it makes sense to use the constructor technique, because it offers a much more readable format. <http://greateventsupport.com/freehand/freehand-lessons/freehand-tutorial.html>
var oInitialization:Object = new Object();
oInitialization. property1 = "value1";
oInitialization. property2 = "value2";
mOriginalInstance.duplicateMovieClip("mNewInstance", 1, oInitialization);

The initialization object, or init object, can be extremely useful in at least two ways:
· You can use the initialization object to initialize the new instance with its own values for built-in movie clip properties, such as _x, _y, _rotation, and so on. By default, the duplicate retains the values for these properties from the original movie clip.
· // Create a duplicate movie clip positioned at 300,300.
· mOriginalInstance.duplicateMovieClip("mNewInstance", 1, {_x: 300, _y: 300});

· You can use the init object to initialize a new instance with copies of the custom method definitions (such as event handler methods) of the original movie clip. By default, custom method definitions are not copied from the original to the duplicate movie clip. However, you can use a for… in loop to populate an initialization object with all the custom properties and methods of the original movie clip, and then pass that initialization object to the duplicateMovieClip( ) method:
· // Create the init object.
· var oInitialization:Object = new Object();
·
· // Use a for…in loop to loop through all the custom properties and methods of
· // the original movie clip instance, and add them to the init object.
· for(var sItem:String in mOriginalInstance) {
· oInitialization [sItem] = mOriginalInstance[sItem];
· }
·
· mOriginalInstance.duplicateMovieClip("mNewInstance", 1, oInitialization);

You can use a for statement to create multiple duplicates at the same time. The basic syntax is as follows:
for(var i:Number = 0; i < numberOfDuplicates; i++) {
originalInstance.duplicateMovieClip (newInstanceName, depth);
}

When you create the new movie clips, make sure each has a unique instance name and a unique depth. Typically, you can generate unique instance names by concatenating the for statement's index variable value with a base name. For example, you might use a base name of mSquare and concatenate that with the value of the for statement's index variable to get instance names of mSquare0, mSquare1, mSquare2, and so on. Then, for the depth, you can either use the value of the for statement's index variable or you can use the getNextHighestDepth( ) method that is discussed in inforestoraninforestoranRecipe 11.10. The following example creates five duplicates with instance names mSquare0 through mSquare4:
for(var i:Number = 0; i < 5; i++) {
mSquare.duplicateMovieClip("mSquare" + i, i);
}

<http://greateventsupport.com/freehand/swatches-panel/system-requirements.html> When you generate duplicate movie clips in batches as shown in the preceding code, you may notice that you don't have a very convenient way to refer to the new instances. When you create a single duplicate with a specific name, you can refer to the new movie clip quite simply. For example, the following code creates a duplicate of mCircle with an instance name of mNewCircle. Then it applies an onPress( ) event handler method to the new movie clip.
mCircle.duplicateMovieClip("mNewCircle", 1, {_x: 100, _y: 100});
mNewCircle.onPress = function():Void {
trace("You clicked on mNewCircle.");
};

However, when you use a for statement to create the duplicates with dynamic instance names, you need a different way to refer to the new movie clips. For example, if you are creating duplicate movie clips with instance names mSquare0, mSquare1, mSquare2, and so on, you cannot use the following code to assign an onPress( ) event handler method to them after you've created them: