Java Annotations

Core Java

@Override

Indicate that a method within a subclass overrides the inherited method from its superclass. This helps prevent method overloading by using the compiler to ensure the method signature matches its inherited signature.

public class Parent {
  public void show(int num) {
    return num + 5;
  }
}

public class Child extends Parent {
  @Override
  public void show(int num) {
    return num + 10;
  }
}

@Deprecated

Communicates that an element (class, method, attribute, etc.) should no longer be used.

public class Example {
  @Deprecated(since = "2.0", forRemoval = true)
  public void calculateTax(double cost) {
    return cost * 0.06;
  }
}

@FunctionalInterface

Indicates that an interface has a Single Abstract Method (SAM).

@FunctionalInterface
interface Example {
  void calculate(int num1, int num2);
}