What are the necessary knowledge points of Java?
This article mainly explains "what are the knowledge points that must be met in Java". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what are the necessary knowledge points of Java"?
Basic knowledge points
1.java development environment is built. It is recommended to start learning from jdk1.8, download jdk and install it.
two。 Understand the difference between jre and jdk
Choice of 3.IDE: both Eclipse and idea are available.
4.Hello world writing
5. Data type
8 basic data types: byte, short, int, long, float, double, char, boolean
Three reference data types: class, interface, array
6. Conditional statement application
7. Loop statement application
The common method of 8.String is to find, concatenate, replace and delete strings.
9. Array
10. Dynamic array (arraylist)
11.hashmap
twelve。 Regular expression application
13.java functions, including function definitions, parameters, and return values
Exception Mechanism of 14.java
15.java naming convention
Object-oriented concept
16. Inheritance, note that you cannot inherit too much in java
17. Encapsulation, focusing on package concepts and keywords public, protected, private and default keywords in the program
18. Polymorphisms, focusing on rewriting and overloading
Application
19. Method encapsulation, that is, code reuse
Overview of 20.JavaIO and reading and writing of files
21.Java Logger, the basic api for entry log reading and writing
twenty-two。 The method of generating jar package by class and introducing third-party jar package
23.maven fundamentals, the key points are:
Install the maven environment
Create a maven project
Maven engineering structure
Pom.xml
Using maven in ide
Basic use of 24.Junit4\ TestNG
For the example application of 25.apache commons-io, try org.apache.commons.lang.StringUtils first
Application of 26.httpclient sending http request for Interface Test
27.selenium web automation application
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