https://www.xgeek.net/salesforce/order-of-execution-in-visualforce-page/

OrderController.java

public class OrderController{
    public String prop1{
       get{
           System.debug('--> prop1 getter');
           return prop1;
       }
       set;
    }
    
    public OrderController(){
        System.debug('--> OrderController constructor');
    }
    
    public void init(){
        System.debug('--> Action mainInit()');
    }
}