仅在Override类上调用super方法

Question

I see this code snippet in a Jenkins plugin and I think that it is no-op

  @Override
  public DescriptorImpl getDescriptor() {
    return (DescriptorImpl)super.getDescriptor();
  }

Any reason that this might be essential and cannot be nuked from the code?

Answer 1

During an override, you can modify the return type (if the new return type is a subclass of the old return type).
For example :

public class A {
  public Number getNumber() { /* ... */ } ;
}

public class B extends A {
  @Override
  public Integer getNumber() { /* ... */ } ;
}

In your sample, super.getDescriptor() may always return a DescriptorImpl object, so you can override the method to avoid some cast in your code.