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Core Java Interview Questions and Answers

Ques. What is the difference between constructors and other methods in core java?
  • Constructor will be automatically invoked when an object is created whereas method has to be called explicitly.
  • Constructor needs to have the same name as that of the class whereas functions need not be the same.
  • There is no return type given in a constructor signature (header). The value is this object itself so there is no need to indicate a return value.
  • There is no return statement in the body of the constructor.
  • The first line of a constructor must either be a call on another constructor in the same class (using this), or a call on the superclass constructor (using super). If the first line is neither of these, the compiler automatically inserts a call to the parameterless super class constructor.
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