Should be the first statement in the constructor?

this or super needs to be first statement in constructor so that child class constructor invokes parent class constructor first . This is required to initialize any variable in parent class before doing any thing in child constructor.

The reason is that “Constructor call must be the first statement in a constructor”.

The Eclipse compiler says “Constructor call must be the first statement in a constructor”. So, it is not stopping you from executing logic before the call to super . It is just stopping you from executing logic that you can’t fit into a single expression. There are similar rules for calling this().11 Tem 2019

Historically, this() or super() must be first in a constructor . This restriction was never popular, and perceived as arbitrary. There were a number of subtle reasons, including the verification of invokespecial, that contributed to this restriction.12 Mar 2017