[Spring]: Inversion of Control

Example wihout IoC

Define interface

public interface Player{
    public String getWorkout();
}

Define class implements Player

public class SoccerPlayer implements Player{
    @Override
    public String getWorkout() {
        return "kick the ball 100 times";
    }
}

Class with main method

public class Demo {
    public static void main(String[] args) {
        Player player = new SoccerPlayer();
        System.out.println(player.getWorkout());
    }
}

• Above snippets are basic object-oriented programming without using Spring's inversion of control
• Spring allows the app to be more configurable
• For example, if I want to create another sub-class BasketballPlayer the code need to be hardcoded as:

Player player = new BasketballPlayer();

• But with the use of Inversion of Control, we can read the implementation name from a config file without changing the sourcecode

Examples with IoC:

Link: xml configuration