In Java, the following are the two ways to create an instance:
- Using constructor
- Using the factory method
I will not go into detailed scenarios on when to use which way, as we all are from Java background, and have read the reasons a number of times. We will directly start with how to use them in the Spring framework one by one. Hope that's fine with you!
Let's take an example of a Car to make it crystal clear how the container creates its object using the following steps:
- Create a Java application
Ch02_Instance_Creation, and add jars that we added in the previous project. - Create a
Carclass in thecom.ch02.beanspackage withchassis_number,color,fuel type,price, andaverageas data members. The code is as follows:
class Car{
private String chassis_number, color, fuel_type;
private long price;
private double average;
}
- Add
show()inCaras shown in the following lines of code:
public void show()
{
System.out.println("showing car "+chassis_number...