Constructors
Invoking a constructor serves as a request to the JVM to construct (instantiate) a brand-new object at run time by allocating enough program memory to house the object’s attributes.
Default Constructors
public class Student {}
Student s = new Student();
Writing Our Own Explicit Constructors
- Replace default parameterless constructor
- Overload constructor
- Using the “this” Keyword to Facilitate Constructor Reuse
There is one very important caveat about default constructors in Java: if we declare any of our own constructors for a class, with any argument signature, then the default parameterless constructor is not automatically provided.