It is important to learn java language with zero foundation to understand language characteristics
[Introduction] There are four main characteristics of the java language, namely encapsulation, inheritance, polymorphism, and abstraction. The java language is a static object-oriented programming language, and the application theory is an object-oriented theory, which requires programmers to have certain language thinking. , In order to facilitate complex programming. It is very important for people who learn java language with zero foundation to have a comprehensive understanding of its characteristics and development prospects. Let's take a look at the specific content.
1. Hot spots of java language
(1) Encapsulation: Encapsulation is the core idea of object-oriented programming. It encapsulates the attributes and behaviors of objects. The carrier is the class. The class usually hides its implementation details from customers. This is the idea of encapsulation. The idea of encapsulation ensures the integrity of the internal data structure of the class. Users who use this class cannot easily directly manipulate this data structure and can only execute public data. This avoids the influence of external operations on internal data and improves the maintainability of the program.
(2) Inheritance: There are also relationships between classes. For example, a department store and a salesperson are related to each other. This relationship between classes is called association. There are many kinds of relationships between two classes, and inheritance is a kind of association. Inheritance means that the child class inherits the properties and behaviors of the parent class. For example, pigeons retain the attributes and behaviors of birds, which saves time in defining the attributes and behaviors that birds and pigeons have in common. This is the basic idea of inheritance.
(3) Polymorphism: Polymorphism refers to multiple manifestations of the same thing in different situations. Polymorphism is actually the feature of applying the parent class object to the subclass. As far as the graphics class is concerned, each graphics has its own ability, which can be regarded as the behavior of the class. If the objects of the subclasses are unified as the instance objects of the parent class, when we draw the graphics, simple Any graphics can be drawn by calling the parent class, that is, the graphics drawing method of the graphics class. This is the basic idea of polymorphism.
(4) Abstraction: Abstraction means that a certain type of object cannot be described in a specific language. For example, a graphic object cannot be described in a specific language. It has several edges and what type of graphic it is. This kind of class is usually defined as an abstract class. Abstraction only changes the behavior and properties of the object, not the details of the method.
2. The development prospects of java
As one of the most popular network programming languages, Java language has played an important role in today's information society. With the rapid development of the Internet and the widening of Web applications, the Java language has also been rapidly developed. According to the statistics of authoritative statistical agencies, among all the needs of software development talents, the demand for Java engineers reaches 60%~70 of the total demand. %, the future employment prospects are very good.
The general monthly salary of Java software engineers is in the range of 6000-10000 yuan, far exceeding the average monthly salary of 2500 yuan for fresh graduates. Generally speaking, the salary of a Java senior software engineer with a year of work experience is roughly around 100,000 to 130,000 per year. Java currently involves a wide range of employment directions, such as JSP website development, Java programming, Java game development, Java desktop programming, and other work related to Java language programming. In addition, you can also work in software design and development work in telecommunications, banking, and insurance professional software development companies. In the next few years. Java still has broad employment prospects.
The above related content, everyone who learns the java language with zero foundation must understand in advance. Of course, the learning of the java language cannot be discussed on paper. The actual code is written and the program operation is the most important!