Using the @Override annotation is useful for two reasons :

• It elicits a warning from the compiler if the annotated method doesn't actually override anything, as in the case of a misspelling.
• It improves the readability of the source code by making it obvious that methods are overridden.

Noncompliant Code Example

class ParentClass {
  public boolean doSomething(){...}
}
class FirstChildClass extends ParentClass {
  public boolean doSomething(){...}  //Non-Compliant
}

Compliant Solution

class ParentClass {
  public boolean doSomething(){...}
}
class FirstChildClass extends ParentClass {
  @Override
  public boolean doSomething(){...}  //Compliant
}