There are following important differences between a constructor and method in java.

• Constructor is used to initialize an object, whereas method is used to exhibits functionality of an object.
• Constructors are invoked implicitly, whereas methods are invoked explicitly.
• Constructor does not return any value, where method may/may not return a value.
• Java compiler provides default constructor if there is no constructor, while this is not the case with method.
  • Constructor is invoked implicitly by the system, whereas a method is invoked by the programmer.
  • Constructor is invoked when a object is created using the keyword new. A method is invoked through method call.
  • Constructor initializes an object that does not exist. A method does operations on an already created object.
  • Constructor cannot be inherited by subclasses, while method can be inherited by subclasses.
• Constructor name must be same as the class name, while the method name may or may not be same as class name.

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