Annotating methods with @java.lang.Override improves code readability since it shows the intent. In addition, the compiler emits an error when a signature of the overridden method doesn't match the superclass method.

Example:

    class X {
      public String toString() {
        return "hello world";
      }
    }
  

After the quick-fix is applied:

    class X {
      @Override
      public String toString() {
        return "hello world";
      }
    }
  

Configure the inspection:

• Use the Ignore 'equals()', 'hashCode()' and 'toString()' option to ignore these java.lang.Object methods: equals(), hashCode(), and toString(). The risk that these methods will disappear and your code won't be compiling anymore due to the @Override annotation is relatively small.
• Use the Ignore methods in anonymous classes option to ignore methods in anonymous classes.
• Disable the Highlight method when its overriding methods do not all have the '@Override' annotation option to only warn on the methods missing an @Override annotation, and not on overridden methods where one or more descendants are missing an @Override annotation.

This inspection only reports if the language level of the project or module is 5 or higher.