Anatomy of a java program смотреть онлайн

There are generally three different pieces of a Java program

image dissecting code pieces of Java program

Class
The class is the outermost layer of the program. It starts with the keywords "public class" and then whatever the name of your file is.

public class YourClass {
The name of your class has to exactly match the name of your file, including capitalization. The class is enclosed by a set of curly braces or "{ }" characters. All code you want to run should be placed between these two characters.

class header

Main Method
The main method is the wrapper that tells your computer which lines of code to run. In Java it has a very specific series of keywords:

public static void main(String[] args) {
After the open curly brace, you should put each line of code you want the computer to run. Don't forget to add the closing curly brace after all your code. As you can see in the image it is convention to add a layer of indentation between the main method and the class, this shows that the main method is inside the class.

main method

Statements
The statements are the lines of code for the computer to run. Each line is called a "statement" and should end with a semi-colon(;). You can have as many statements as you want, the computer will run each line from top to bottom one after the other. Again, as these are inside the main method all statements should be one level of indentation in.