To create a simple Java program, you need to create a class that contains the main method.
class Simple{
public static void main(String args[]){
System.out.println("Hello Java");
}
}
Save the above file as Simple.java.
To compile: javac Simple.java
To execute: java Simple
The meaning of class, public, static, void, main, String[], System.out.println() is:
- class keyword is used to declare a class in Java.
- public keyword is an access modifier that represents visibility. It
means it is visible to all.
- static is a keyword. If we declare any method as static, it is known
as the static method. The core advantage of the static method is that
there is no need to create an object to invoke the static method. The
main() method is executed by the JVM, so it doesn't require creating an
object to invoke the main() method. So, it saves memory.
- void is the return type of the method. It means it doesn't return
any value.
- main represents the starting point of the program.
- String[] args or String args[] is used for command line
argument
- System.out.println() is used to print statement. Here, System is a class, out is an
object of the PrintStream class, println() is a method of the PrintStream
class.
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