( ! ) Deprecated: Function WP_Dependencies-&gt;add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /var/www/html/wp-includes/functions.php on line 6131
Call Stack
#TimeMemoryFunctionLocation
10.0000484048{main}( ).../index.php:0
20.0000484400require( '/var/www/html/wp-blog-header.php ).../index.php:17
30.10334086512require_once( '/var/www/html/wp-includes/template-loader.php ).../wp-blog-header.php:19
40.10384115504include( '/var/www/html/wp-content/themes/twentyfifteen/single.php ).../template-loader.php:125
50.10384115504get_header( $name = ???, $args = ??? ).../single.php:10
60.10384115720locate_template( $template_names = [0 => 'header.php'], $load = TRUE, $load_once = TRUE, $args = [] ).../general-template.php:48
70.10384115816load_template( $_template_file = '/var/www/html/wp-content/themes/twentyfifteen/header.php', $load_once = TRUE, $args = [] ).../template.php:749
80.10384116360require_once( '/var/www/html/wp-content/themes/twentyfifteen/header.php ).../template.php:814
90.10394123768wp_head( ).../header.php:18
100.10394123768do_action( $hook_name = 'wp_head' ).../general-template.php:3197
110.10394123984WP_Hook->do_action( $args = [0 => ''] ).../plugin.php:522
120.10394123984WP_Hook->apply_filters( $value = '', $args = [0 => ''] ).../class-wp-hook.php:365
130.10414127400wp_enqueue_scripts( '' ).../class-wp-hook.php:341
140.10414127400do_action( $hook_name = 'wp_enqueue_scripts' ).../script-loader.php:2311
150.10414127616WP_Hook->do_action( $args = [0 => ''] ).../plugin.php:522
160.10414127616WP_Hook->apply_filters( $value = '', $args = [0 => ''] ).../class-wp-hook.php:365
170.10424129504twentyfifteen_scripts( '' ).../class-wp-hook.php:341
180.10434131024wp_style_add_data( $handle = 'twentyfifteen-ie', $key = 'conditional', $value = 'lt IE 9' ).../functions.php:440
190.10434131024WP_Styles->add_data( $handle = 'twentyfifteen-ie', $key = 'conditional', $value = 'lt IE 9' ).../functions.wp-styles.php:245
200.10434131024WP_Dependencies->add_data( $handle = 'twentyfifteen-ie', $key = 'conditional', $value = 'lt IE 9' ).../class-wp-styles.php:385
210.10434131024_deprecated_argument( $function_name = 'WP_Dependencies->add_data()', $version = '6.9.0', $message = 'IE conditional comments are ignored by all supported browsers.' ).../class-wp-dependencies.php:317
220.10434131344wp_trigger_error( $function_name = '', $message = 'Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers.', $error_level = 16384 ).../functions.php:5925
230.10444137728trigger_error( $message = 'Function WP_Dependencies-&gt;add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers.', $error_level = 16384 ).../functions.php:6131
( ! ) Deprecated: Function WP_Dependencies-&gt;add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /var/www/html/wp-includes/functions.php on line 6131
Call Stack
#TimeMemoryFunctionLocation
10.0000484048{main}( ).../index.php:0
20.0000484400require( '/var/www/html/wp-blog-header.php ).../index.php:17
30.10334086512require_once( '/var/www/html/wp-includes/template-loader.php ).../wp-blog-header.php:19
40.10384115504include( '/var/www/html/wp-content/themes/twentyfifteen/single.php ).../template-loader.php:125
50.10384115504get_header( $name = ???, $args = ??? ).../single.php:10
60.10384115720locate_template( $template_names = [0 => 'header.php'], $load = TRUE, $load_once = TRUE, $args = [] ).../general-template.php:48
70.10384115816load_template( $_template_file = '/var/www/html/wp-content/themes/twentyfifteen/header.php', $load_once = TRUE, $args = [] ).../template.php:749
80.10384116360require_once( '/var/www/html/wp-content/themes/twentyfifteen/header.php ).../template.php:814
90.10394123768wp_head( ).../header.php:18
100.10394123768do_action( $hook_name = 'wp_head' ).../general-template.php:3197
110.10394123984WP_Hook->do_action( $args = [0 => ''] ).../plugin.php:522
120.10394123984WP_Hook->apply_filters( $value = '', $args = [0 => ''] ).../class-wp-hook.php:365
130.10414127400wp_enqueue_scripts( '' ).../class-wp-hook.php:341
140.10414127400do_action( $hook_name = 'wp_enqueue_scripts' ).../script-loader.php:2311
150.10414127616WP_Hook->do_action( $args = [0 => ''] ).../plugin.php:522
160.10414127616WP_Hook->apply_filters( $value = '', $args = [0 => ''] ).../class-wp-hook.php:365
170.10424129504twentyfifteen_scripts( '' ).../class-wp-hook.php:341
180.12964138832wp_style_add_data( $handle = 'twentyfifteen-ie7', $key = 'conditional', $value = 'lt IE 8' ).../functions.php:444
190.12964138832WP_Styles->add_data( $handle = 'twentyfifteen-ie7', $key = 'conditional', $value = 'lt IE 8' ).../functions.wp-styles.php:245
200.12964138832WP_Dependencies->add_data( $handle = 'twentyfifteen-ie7', $key = 'conditional', $value = 'lt IE 8' ).../class-wp-styles.php:385
210.12964138832_deprecated_argument( $function_name = 'WP_Dependencies->add_data()', $version = '6.9.0', $message = 'IE conditional comments are ignored by all supported browsers.' ).../class-wp-dependencies.php:317
220.12964139152wp_trigger_error( $function_name = '', $message = 'Function WP_Dependencies->add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers.', $error_level = 16384 ).../functions.php:5925
230.12974139376trigger_error( $message = 'Function WP_Dependencies-&gt;add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers.', $error_level = 16384 ).../functions.php:6131

Object-Oriented Programming Concepts

Object-Oriented Programming Concepts

If you’ve never used an object-oriented programming language before, you’ll need to learn a few basic concepts before you can begin writing any code. This lesson will introduce you to objects, classes, inheritance, interfaces, and packages. Each discussion focuses on how these concepts relate to the real world, while simultaneously providing an introduction to the syntax of the Java programming language.

What Is an Object?


An object is a software bundle of related state and behavior. Software objects are often used to model the real-world objects that you find in everyday life. This lesson explains how state and behavior are represented within an object, introduces the concept of data encapsulation, and explains the benefits of designing your software in this manner.

What Is a Class?


A class is a blueprint or prototype from which objects are created. This section defines a class that models the state and behavior of a real-world object. It intentionally focuses on the basics, showing how even a simple class can cleanly model state and behavior.

What Is Inheritance?


Inheritance provides a powerful and natural mechanism for organizing and structuring your software. This section explains how classes inherit state and behavior from their superclasses, and explains how to derive one class from another using the simple syntax provided by the Java programming language.

What Is an Interface?


An interface is a contract between a class and the outside world. When a class implements an interface, it promises to provide the behavior published by that interface. This section defines a simple interface and explains the necessary changes for any class that implements it.

What Is a Package?


A package is a namespace for organizing classes and interfaces in a logical manner. Placing your code into packages makes large software projects easier to manage. This section explains why this is useful, and introduces you to the Application Programming Interface (API) provided by the Java platform.

Questions and Exercises: Object-Oriented Programming Concepts


Use the questions and exercises presented in this section to test your understanding of objects, classes, inheritance, interfaces, and packages.

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