#constructor injection

Dagger tips: the potentiality of Constructor Injection

Remember my posts [Dagger tips for using AndroidInjector] and [Dagger tips for modularization]? I didn’t talk too much about the constructor injection way in the project. But it has great potentialities to let your injection more robust and more flexible. Let’s see how we can use constructor injection for providing multi-source injection for the different release version.

Check the repo[click here

Constructor Injection With Collection

Spring framework provides support of collection framework. The collection in the sense, list, set, map and properties interfaces are included. In this post, we will see how this collection framework will be handled in spring through constructor injection.

Constructor Injection With List Collection:

List allows to add duplicate elements and ‘null’ elements. To set values to list collection then…

If the dependencies are injected by calling constructor of an object then it is called constructor injection.

Example:

Below class is POJO class i.e., StudentBean Class having private member variables and parameterized constructor.

package com.spring.constructor;

//Bean class

public class StudentBean {

public StudentBean(String stdName, int rollNum, Marks marks) {

this.stdName = stdName;

this.…

Dependency injection (DI) is a process whereby objects define their dependencies, that is, the other objects they work with, only through constructor arguments, arguments to a factory method, or properties that are set on the object instance after it is constructed or returned from a factory method. The container then injects those dependencies when it creates the bean. This process is…