Please explain @interface with an example

Please explain @interface with an example

Here is the code snippet:

@Retention(RUNTIME)
@Target({ FIELD })
public @interface InjectProperty {
  boolean required default true;
}

Main Application:

@InjectProperty(required = false)
private Boolean isTrue;

@InjectProperty(required = false)
private Runnable runnable;
where Runnable is an interface.

Could you please explain what does all these mean? How all these work

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