How to assign super to a variable?

Question

I\'d like to do the following:

public class Sub extends Super {
  public Sub(Super underlying) {
    if (underlying == null) {
      underlying = super; // this          


        

Answer 1

public class Sub extends Super {
  public Sub(Super underlying) {
    this.underlying = (underlying == null)
        ? new Super()
        : underlying;
  }

  @Override
  public void method() {
    underlying.method();
  }
}

Since another object is being created, it's not exactly the same, but it behaves as expected.