UrbanPro
true

Learn Java Training from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Search in

Spring - Dependency Injection (DI)

Gaurav Kothari
18/11/2020 0 0

Spring - Dependency Injection (DI)

DI is a framework which provides loose coupling in code. Here loose coupling means no hard coding of the object. Instead of hard coding, we will be injecting these object from some configurations (XML based, java based, annotation-based).

DI is nothing but design patterns which give you the lightweight loosely couple enterprise application in the result.

What is an injection? -- Inserting of an object/ value into a class whenever the help requires it of third party configurations.

There is two way of achieving Dependency Injection:

  • By Constructor
  • By Setter method

Constructor Injection: Injecting any object/ value through the constructor of a class. For, e.g., I have a Test class with the parameterized constructor in it, and I am initializing parameter of that constructor from the external source, i.e. XML file. See how

public class Test { 

private int id; 

public Test(int id) {

this.id = id;

}

XML configuration file: //here now 100 will be assigned to the id of Test class

 

Setter method Injection: Injecting any object/ value through the setter method of a class. For, e.g., I have a Test class with setter method in it, and I am initializing parameter of that setter method from the external source, i.e. XML file. See how

public class Test { 

private int id; 

public int getId() { 

  return id; 

public void setId(int id) { 

   this.id = id; 

}

}

XML configuration file: //here now 100 will be assigned to the id of Test class

 

Please add on comments and like this lesson, if it gave you some revision or refreshment on Spring - Dependency Injection (DI) concepts.

0 Dislike
Follow 2

Please Enter a comment

Submit

Other Lessons for You

Priority in TestNG
public class Priority { @Test (priority=1)public void login() {System.out.println("login");} @Testpublic void email1() {System.out.println("email1");} @Test (priority=-2)public void email2() {System.out.println("email2");} //I...

Sarthak Chadha | 22/11/2021

0 0
0

Example of DependsOnMethod in TestNG
public class dependsonM { @Test public void login() { System.out.println("login"); } @Test (dependsOnMethods = {"login"}) public void email() { //Intentionally I am failing this testcase Assert.assertTrue(false);...

Sarthak Chadha | 18/11/2021

0 0
0

TestNG Annotations and its sequence
public class TestNGAnnotations { @BeforeMethod public void beforeM() { System.out.println("Before Method"); } @AfterMethod public void afterMethod() { System.out.println("After Method"); } @BeforeClass...

Sarthak Chadha | 18/11/2021

0 0
0

ListIterator Example
public class ListIteratorEx { public static void main(String args) { List<String> li = new ArrayList<String>(); li.add("java1"); li.add("java2"); li.add("java3"); li.add("java4"); ListIterator...

Sarthak Chadha | 18/11/2021

0 0
0

doWhile example in Java
public class doWhilePracticleEx { public void test() { } public static void main(String args) { String q1 = "Who is PM of India?"; String a1 = "Sonia Gandhi"; String a2 = "Rahul Gandhi"; String a3...

Sarthak Chadha | 18/11/2021

0 0
0
X

Looking for Java Training Classes?

The best tutors for Java Training Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Learn Java Training with the Best Tutors

The best Tutors for Java Training Classes are on UrbanPro

Book a Free Demo

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more