Dependency injection java

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Powerful Pigeon answered on February 21, 2022 Popularity 10/10 Helpfulness 2/10

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Dependency injection java

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// Entity
        public class News {
            private int id;
            private String title;
            private String description;
            private boolean deleted;
        
            public News(String title,String description){
                this.title = title;
                this.description = description;
            }
        
            // getter setter etc
            
        }

Popularity 10/10 Helpfulness 2/10 Language java

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Tags: dependency-injection java

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Contributed on Feb 21 2022

Powerful Pigeon

0 Answers Avg Quality 2/10

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Dependency injection java

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import java.util.List;
            // Controller
            public class NewsController {
                // Internal reference to the service used by this client
                private NewsServices newsServices;

                public NewsController(NewsServices newsServices){
                    // Constructor injection
                    this.newsServices = newsServices;
                }
                // Injected Methods
                public List getAll() {
                    return newsServices.findAll();
                }
                public News getOne(int id){
                    return newsServices.findOne(id);
                }

            }

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Contributed on Feb 21 2022

Powerful Pigeon

0 Answers Avg Quality 2/10

dependency injection java

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public interface SomeInterface{
    public int someMethod();
}

public class Independent implements SomeInterface{
    @Override
    public int someMethod(){
        return 2; // Your logic
    }
}

public class Dependent{
    private SomeInterface someObj; 

    public Dependent(SomeInterface someObj){ // Receiving constructor dependency
        this.someObj = someObj; 
    }

    public void injectionMethod(SomeInterface someObj){ // Receiving method dependency
        var x = someObj.someMethod();
        System.out.println(x);
    }

    public void setValue(SomeInterface someObj){  // Receiving setter dependency
        this.someObj = someObj; // NOT "someObj = new Independent();"
    }

}

class Main {
  public static void main(String[] args) {
    var independentObj = New Independent();
    // Main class is acting as an injector class
    var dependentObj = New Dependent(independentObj); // Injecting constructor dependency
    dependentObj.setValue(new Independent());  // Injecting setter dependency
    dependentObj.injectionMethod(new Independent());  // Injecting method dependency
  }
}

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Contributed on Aug 08 2023

Innocent Iguana

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Dependency injection java

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import java.util.List;
            // Data Access Object
            public interface NewsDao {
                List findAll(); // List type contains generic News class
                News findOne(int id);
            }

Popularity 10/10 Helpfulness 2/10 Language java

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Contributed on Feb 21 2022

Powerful Pigeon

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with out dependency injection java

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// A simple dependency class
public class Dependency {
    public void performAction() {
        System.out.println("Action performed by Dependency");
    }
}

// Service class without dependency injection
public class MyService {
    private final Dependency dependency;

    // Constructor creating an instance of Dependency internally
    public MyService() {
        this.dependency = new Dependency();
    }

    public void doSomething() {
        // Using the internally created dependency
        dependency.performAction();
    }
}

// Main application class
public class MyApp {
    public static void main(String[] args) {
        // Creating an instance of MyService
        MyService myService = new MyService();

        // Using the MyService instance
        myService.doSomething();
    }
}

Popularity 7/10 Helpfulness 1/10 Language java

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Contributed on Jan 18 2024

solomon bekele

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Dependency injection java

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