What does a java source file consist of?

Java source file is composed of three parts: the first part is the class or external structure, such as "class Student{}"; the second part is the main() method, also called the entry of the program; the third part Part of the code is written in the main method.

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Java source file is composed of three parts,

The first part is a class or external structure:

Example:

class Student{
}

The second part It is the main method, also called the entrance of the program

There are three points that everyone needs to pay attention to when learning:

The third part is writing the code

There are three points that everyone needs to pay attention to here:

1. The current code is written in the main method ;

2. You can write as many statements as you like, and the statements end with an English semicolon;

3. Suggestion: Write one statement per line.

The final output statement,

System.out.print(“大小写字母、数字、汉字以及特殊符号，但是输出后不换行”);
System.out.println(“输出内容同上，但是输出后换行”);

There is another point that needs to be learned, that is, comments, the following two points:

1. Function: explanation, in the program It is not executed in the program, mainly to increase the readability of the program

2. Category:

单行注释//
多行注释/* 注释内容 */
文档注释/** 注释内容 */

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