Course Intermediate  13511

Course Introduction：This course will use short and concise language to develop a mall in a modular manner to facilitate code reuse. There is no need to spend a lot of time learning other unrelated functions to implement one function. At the same time, all courses are combined into one The complete shopping mall project is very suitable for students to practice.

Course Elementary  44010

Course Introduction：PHP native code operates the background management page and can perform addition, deletion, modification and query operations.

Course Advanced  13125

Course Introduction：Infinite classification is very common in daily applications, and website classification relies on it. This course will explain in detail the usage scenarios and common implementation methods of infinite classification, to help future learning and use.

Course Advanced  32921

Course Introduction：Infinite classification is very common in daily applications, and website classification relies on it. This course will explain in detail the usage scenarios and common implementation methods of infinite classification, to help future learning and use.

Course Advanced  8442

Course Introduction："PHP Development Classification Technology Tutorial" explains PHP unlimited classification technology. Achieve a multi-level classification linkage effect.

Course Introduction：Abstract classes include abstract methods and non-abstract methods. Abstract classes cannot be instantiated. A sealed class prevents inheritance and cannot be used as a base class. Abstract Class To declare an abstract class, you need to put the keyword abstract before the class definition. An example of a class member in an abstract class is as follows, an abstract method is defined - publicabstractclassVehicle{ publicabstractvoiddisplay();} The abstract method definition is followed by a semicolon because it is not implemented. Sealed class To declare a sealed class, you need to place the keyword seal class definition in front. A sealed class prevents inheritance, and you cannot use it as a base class. publicse

2023-09-14 comment 0  846

Course Introduction：Class selector types include basic class selector, multi-class selector, hierarchical class selector, sub-element class selector, adjacent sibling class selector, universal sibling class selector, attribute value class selector and negative class selector, etc. . Detailed introduction: 1. Basic class selector, using a selector starting with a dot, means selecting elements with specified class names; 2. Multi-class selector, using a selector combining multiple class names, means selecting elements with multiple specified class names. For elements of class names, there is no need for spaces between multiple class names, just write them consecutively; 3. Hierarchical class selectors, selectors separated by spaces, etc.

2023-10-07 comment 0  2115

Course Introduction：There are four main types of classes in Java: ordinary classes, abstract classes, interfaces and enumeration types. Ordinary classes are used to create custom objects, abstract classes contain abstract methods, interfaces define method signatures, and enumerated types represent a set of fixed values.

2024-04-27 comment 0  517

Course Introduction：In Java, an inner class is simply a class that’s defined inside another class or interface. Inner classes help keep related code together, making programs easier to read and understand. They also allow inner classes to access the outer class’s privat

2024-10-27 comment 0  415

Course Introduction：No, in Java, a parent class does not directly contain a child class. Subclasses possess the characteristics of the parent class by inheriting its methods and properties. Inheritance, polymorphism, and overriding are key elements of the relationship between parent and child classes.

2024-04-26 comment 0  991