Chapter 4 Reading Java Objects & Classes

Chapter 4 Reading Java Objects & Classes

1. Constructor: Used to construct an object; each class must contain one of these and it will have the same name as the class.

   • Java Object (aka Instance): can be thought of as everyday objects in life that describe
     • Attributes (aka fields): they are variables; almost like qualities
     • Actions (aka methods/functions): describe what the object can do/preform
       • Declaration Part (aka signature of the method)
         • return value
         • method name
         • list of arguments
       • Body:
         • code that can preform the action
       • *Note* : The return type of a method can be a primitive, an object, or a void. The retunr type void means that the method returns nothing

2. Example of UML class diagram

   • The "Dog" is the class, "breed, size, age, & color" are the list of fields or attributes, and "eat, sleep, sit, run" are the methods or actions

3. Java Class: a blueprint or template to create objects of identical type; determines what kind of object you get

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