What is the basis of Java language

Many Java programming beginners don’t know what necessary basic knowledge they should learn when they first come into contact with Java language programs. Here are some key points for learning the basics of Java programming language from scratch. I hope it will be helpful to novices who are learning the basics of Java programming.

1. First understand what the four aspects of Java are.

It is also essential for beginners to first understand these basic concepts of Java. Memorizing them by rote will definitely not work. The important thing is to understand, understand the differences and connections between them, and what are their applications. . Think about what knowledge points are used in these codes. Don't blindly type code according to the book. rather than understand.

Java programming language, that is, grammar.

Java file format, that is, the suffix of various folders and files.

Java Virtual Machine (JVM), which is the interpreter that processes *.class files.

Java Application Programming Interface (Java API).

You must know that java is divided into two parts: one is compilation and the other is running.

javac: Responsible for the compilation part. When javac is executed, the java compiler program will be started. Compile the .java file with the specified extension. A bytecode file that can be recognized by jvm is generated. That is, the class file, which is the running program of java.

java: The part responsible for running. It will start the jvm, load the class libraries required for runtime, and execute the class file.

For a file to be executed, there must be an execution The starting point, this starting point is the main function.

2. Master static methods and attributes

Static methods and attributes are used to describe the characteristics of a certain type of object group , rather than the characteristics of a single object. Static methods and properties are heavily used in Java, and this is a common trick. But this technique is not used frequently in many languages. Understanding static methods and properties is very helpful for understanding the relationship between classes and objects. In a large number of Java specifications, static methods and properties are frequently used. Therefore learners should understand static methods and properties. Java is consistent in calling methods and properties. The difference is only reflected in the declaration, which is different from C.

3. Beginners also need to understand the relationship between the three technical platforms of JAVA.

Java is divided into three systems, namely Java SE (J2SE, Java2 Platform Standard Edition, Standard Edition).

JavaEE (J2EE, Java 2 Platform, Enterprise Edition, Enterprise Edition).

Java ME (J2ME, Java 2 Platform Micro Edition, micro version).

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