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Most of the methods defined by Object are discussed elsewhere in this book However, one deserves special attention: clone( ) The clone( ) method generates a duplicate copy of the object on which it is called Only classes that implement the Cloneable interface can be cloned The Cloneable interface defines no members It is used to indicate that a class allows a bitwise copy of an object (that is, a clone) to be made If you try to call clone( ) on a class that does not implement Cloneable, a CloneNotSupportedException is thrown When a clone is made, the constructor for the object being cloned is not called A clone is simply an exact copy of the original Cloning is a potentially dangerous action, because it can cause unintended side effects For example, if the object being cloned contains a reference variable called obRef, then when the clone is made, obRef in the clone will refer to the same object as does obRef in the original If the clone makes a change to the contents of the object referred to by obRef, then it will be changed for the original object, too Here is another example: If an object opens an I/O stream and is then cloned, two objects will be capable of operating on the same stream Further, if one of these objects closes the stream, the other object might still attempt to write to it, causing an error In some cases, you will need to override the clone( ) method defined by Object to handle these types of problems Because cloning can cause problems, clone( ) is declared as protected inside Object This means that it must either be called from within a method defined by the class that implements Cloneable, or it must be explicitly overridden by that class so that it is public Let s look at an example of each approach.

The configuration files for Apache are located in the /etc/httpd/conf/ directory on a Fedora or Red Hat Enterprise Linux (RHEL) system, and for our sample source install, the path will be /usr/local/httpd/conf/ The main configuration file is usually named httpdconf on Red Hat like distributions like Fedora On Debian-like systems, the main configuration file for Apache is named /etc/apache2/apache2conf The best way to learn more about the configuration files is to read the httpdconf file The default configuration file is heavily commented, explaining each entry, its role, and the parameters you can set

Note Keep in mind as you edit existing images or create your own that the size of the image that can be

Part II:

The following program implements Cloneable and defines the method cloneTest( ), which calls clone( ) in Object:

The default configuration settings work just fine right out of the box, and for basic needs, may require no further modification Nevertheless, site administrators may need to customize their web server or web site further This section discusses some of the common directives or options that are used in Apache s configuration file

// Demonstrate the clone() method class TestClone implements Cloneable { int a; double b; // This method calls Object's clone() TestClone cloneTest() { try { // call clone in Object return (TestClone) superclone(); } catch(CloneNotSupportedException e) { Systemoutprintln("Cloning not allowed"); return this; } } } class CloneDemo { public static void main(String args[]) { TestClone x1 = new TestClone(); TestClone x2; x1a = 10; x1b = 2098; x2 = x1cloneTest(); // clone x1 Systemoutprintln("x1: " + x1a + " " + x1b); Systemoutprintln("x2: " + x2a + " " + x2b); } }

Here, the method cloneTest( ) calls clone( ) in Object and returns the result Notice that the object returned by clone( ) must be cast into its appropriate type (TestClone) The following example overrides clone( ) so that it can be called from code outside of its class To do this, its access specifier must be public, as shown here:

This is used for specifying the base directory for the web server On Fedora, RHEL, and Centos distributions, this value, by default, is the /etc/httpd/ directory The default value for this directive in Ubuntu, OpenSuSE, and Debian Linux distributions is /etc/ apache2/

// Override the clone() method class TestClone implements Cloneable { int a; double b; // clone() is now overridden and is public public Object clone() { try { // call clone in Object return superclone(); } catch(CloneNotSupportedException e) {

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Systemoutprintln("Cloning not allowed"); return this; } } } class CloneDemo2 { public static void main(String args[]) { TestClone x1 = new TestClone(); TestClone x2; x1a = 10; x1b = 2098; // here, clone() is called directly x2 = (TestClone) x1clone(); Systemoutprintln("x1: " + x1a + " " + x1b); Systemoutprintln("x2: " + x2a + " " + x2b); } }

displayed on the NXT brick s LCD screen will be limited to what s visible on the Image Editor workspace here. If you wish the image to appear on the screen, it must fit on the grid workspace.

This is the port(s) on which the server listens for connection requests It can also be used to specify the particular IP addresses over which the web server accepts connections The default value for this directive is 80 for nonsecure web communications

The side effects caused by cloning are sometimes difficult to see at first It is easy to think that a class is safe for cloning when it actually is not In general, you should not implement Cloneable for any class without good reason