Why call to this() must be first statement in constructor?

Answer 1

It's required. This is a design of Java put in by the developers of the Java language. The reasoning is up for debate. Hierarchy, calling unconstructed objects, are a couple reasons.

Answer 2

u can call super() or this() be first statement

Answer 3

in case of overloading the constructors calling of those can be done through this and super .Super can get parent class constructor.whereas this refers to particular constructor in a class.Providimg both on the first line would lead to ambiguity which should be called first? These keywords should be mentioned in the first line so that calling them and it carries operations in accordance