Java Syntax
Java Tutorial » Java Syntax
A program in java, we can directly see it as a collection of objects that communicate with each other by invoking their own methods.
Object - Objects have state and behavior.
Class - A class can be defined as a template that describes the behavior and states of an object
Methods - A method is actually a behavior of the object. A class can contain several methods. In the methods is written the logic of the application, the dice are manipulated and actions executed.
Instance - Each newly created object has a set of instance variables. The state of an object is created by the values assigned to these instance variables.
Java Sintax
The first program Let's make a program that displays the text Hi, start to learn java programming with agernic.com on display.
Example:
public class Main
{
public static void main(String[] args)
{
System.out.println("Hi, start to learn java programming with agernic.com");
}
}
{
public static void main(String[] args)
{
System.out.println("Hi, start to learn java programming with agernic.com");
}
}
Every line of code that runs in Java must be inside a class. In our example, we named the class Main.
When we talk about Java we have to keep in mind the following things:
Case Sensitive - java is case sensitive, which means that Hello is different from hello
Class Names - Class names always start with a capital letter. If we have more words in the class name we use camelCase.
Method names - Method names must begin with a lowercase letter. If we have several words in the name we use camelCase.
File names - File names must be identical to class names.
public static void (String args []) - the main method must always appear.
The main Method
The main() method is required and you will see it in every Java program:
Example:
public static void main(String[] args)
Any code inside the main()
System.out.println()
Inside the main() method, we can use the println() method to print a line of text to the screen:
Example:
public static void main(String[] args) {
System.out.println("Hello World");
}
System.out.println("Hello World");
}
Note: The curly braces {} marks the beginning and the end of a block of code.
Note: Each code statement must end with a semicolon.
Note: Each code statement must end with a semicolon.
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Java Syntax - java
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