🚀 No, they happen at different points in the Bean lifecycle.

🔍 1️⃣ Constructor Injection Happens First

Constructor injection happens during the Bean Instantiation Phase, meaning before the object is fully created

Example: Constructor Injection

@Component
public class MyService {
    private final String configValue;

    public MyService(@Value("${app.config}") String configValue) {  // ✅ Injected during instantiation
        this.configValue = configValue;
        System.out.println("Constructor: configValue = " + configValue);
    }
}

✅ What Happens?

1. Spring creates the Bean (new MyService(configValue)).
2. The @Value property is resolved BEFORE the Bean is fully created.
3. The constructor completes, and the Bean is fully initialized.

⏳ Happens during: Bean Instantiation Phase.

🔍 2️⃣ Field Injection (@Value) Happens After Bean Instantiation

Field injection (@Value on fields) happens in the Dependency Injection Phase, after the Bean is created.

Example: Field Injection with @Value

java
CopyEdit
@Component
public class MyService {
    @Value("${app.config}")
    private String configValue;  // ❌ Injected AFTER constructor runs

    public MyService() {
        System.out.println("Constructor: configValue = " + configValue); // ❌ Will print null!
    }

    @PostConstruct
    public void init() {
        System.out.println("PostConstruct: configValue = " + configValue);  // ✅ Injected here
    }
}

✅ What Happens?

1. Spring creates the object (new MyService()).
2. The constructor runs, but configValue is still null.
3. Only after instantiation, Spring injects the @Value property.