Papillary thyroid cancer (also sometimes called papillary thyroid carcinoma) is the most common type of thyroid cancer. You may have even heard your doctor talk about metastatic papillary thyroid cancer (metastatic means that it has spread beyond your thyroid gland).
Classes can have special methods called constructors. A constructor is a method that is automatically called when an object is created. Constructors are used to perform operations at the time an object is created. Constructors typically initialize instance fields and perform other object initialization tasks.
Using the this Keyword. Within an instance method or a constructor, this is a reference to the current object  the object whose method or constructor is being called. You can refer to any member of the current object from within an instance method or a constructor by using this.