Hello World - Java
One of the most important aspects of Java syntax is the use of classes. Classes are the building blocks of Java programs which contains methods. Every Java program must have atleast one class to run. Classes defines the data and behavior of objects.It also referred as blueprint of objects.
Objects are the instances of classes. They are created using the new keyword. Objects can be used to store data, perform actions, and interact with other objects.
Another important aspect of Java syntax is the use of methods. Methods are blocks that contains code to perform a specific task. Methods are defined within classes. They can be called by other methods or by objects.
The main() method is the beginning point for all Java programs. It is the first method that is executed when java program starts running. The main() method must be defined in a class that is public and has a void return type.
Hello world - Example
Java Code
public class Main{
public static void main(String[] args) {
System.out.println("Hello World!");
}
}
Hello World - Output
Hello, world!
The HelloWorld class is a public class with a main() method. The main() method prints the message "Hello, world!" to the console using the System.out.println() statement.
public class HelloWorld - class
public static void main(String[] args) - method
System.out.println("Hello, world!"); - Print statement
Lets see about proper structure of Java to understand how to build a java program.
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