The java main() method and an Object creation process (#4)

----------Object creation by JVM-----------

Description:

The object car1 is an instance of Car class created by JVM.As shown below the new keyword is use to create car1 object from the Car class.

Car car1 = new Car();

Car class Reference -> http://namastejava.blogspot.jp/2015/01/java-source-translation-to-class-file-3.html

Each object is isolated from each other and maintains their own state (value for each property). e.g. car1 object’s price = 1000000, where as car2 object’s price = 2000.

-----------Source [CarApp.java]------------
public class CarApp {

public static void main(String[] args) {

//car1 instance

Car car1 = new Car();

car1.setPrice(1000000);

car1.setCurrency("JPY");

double p1 = car1.getPrice();

String c1 = car1.getCurrency();

System.out.println("Price1 = " + p1);

System.out.println("Currency1 = " + c1);

//car2 instance

Car car2 = new Car();

car2.setPrice(2000);

car2.setCurrency("USD");

//car3 instance

Car car3 = new Car();

car3.setPrice(5000);

car3.setCurrency("EUR");

}

}

Description:

The main() method

•  is an entry point to the Application

•  is a special method, which is already known to JVM

•  should exist for each Java application

•  is static, hence JVM can access it without Instance of the target class

•  returns void

•  takes parameters of type String array, these are use to pass values at the time of application start up.