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/* Here, Box uses a constructor to initialize the dimensions of a box */ class Box { double width; double height; double depth; // This is the constructor for Box Box() { Systemoutprintln("Constructing Box"); width = 10; height = 10; depth = 10; } // compute and return volume double volume() { return width * height * depth; } } class BoxDemo6 { public static void main(String args[]) { // declare, allocate, and initialize Box objects Box mybox1 = new Box(); Box mybox2 = new Box(); double vol; // get volume of first box vol = mybox1volume(); Systemoutprintln("Volume is " + vol); // get volume of second box vol = mybox2volume(); Systemoutprintln("Volume is " + vol); } }

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When this program is run, it generates the following results: Constructing Box Constructing Box Volume is 10000 Volume is 10000

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A window similar to this will appear:

As you can see, both mybox1 and mybox2 were initialized by the Box( ) constructor when they were created Since the constructor gives all boxes the same dimensions, 10 by 10 by 10, both mybox1 and mybox2 will have the same volume The println( ) statement inside Box( ) is for the sake of illustration only Most constructors will not display anything They will simply initialize an object Before moving on, let s reexamine the new operator As you know, when you allocate an object, you use the following general form: class-var = new classname( ); Now you can understand why the parentheses are needed after the class name What is actually happening is that the constructor for the class is being called Thus, in the line

Figure 18-20. Create a constant to hold a value available to other programs. Now I need to provide a name and data type for the constant. I click the Create button (see Figure 18-20) and enter StartToFinish for the Name, and I select Number from the Data Type drop-down menu and enter a value (24 for this example) in the Value section, as shown in Figure 18-21.

If the preceding command complains about some missing dependencies, it is probably saying that you don t have the appropriate Qt development environment and a few other necessary packages Assuming that you are connected to the Internet, you can take care of its whining by using Yum to install the proper package(s) over the Internet by typing

Box mybox1 = new Box();

new Box( ) is calling the Box( ) constructor When you do not explicitly define a constructor for a class, then Java creates a default constructor for the class This is why the preceding line of code worked in earlier versions of Box that did not define a constructor The default constructor automatically initializes all instance variables to zero The default constructor is often sufficient for simple classes, but it usually won t do for more sophisticated ones Once you define your own constructor, the default constructor is no longer used

The kernel configuration window that appears is divided into three panes The left pane shows an expandable tree-structured list of the overall configurable kernel options The upper-right pane displays the detailed configurable options of the parent option that currently has the focus in the left pane Finally, the lower-right pane displays useful help information for the currently selected configuration item 3 We will examine one very important option a little more closely by selecting it in the left pane Use your mouse to click the Loadable Module Support item in the left pane On almost all Linux distributions, you will see that the support for this feature is enabled In the upper-right pane, select the Enable Loadable Module

While the Box( ) constructor in the preceding example does initialize a Box object, it is not very useful all boxes have the same dimensions What is needed is a way to construct Box objects of various dimensions The easy solution is to add parameters to the constructor As you can probably guess, this makes them much more useful For example, the following version of Box defines a parameterized constructor that sets the dimensions of a box as specified by those parameters Pay special attention to how Box objects are created