Object Oriented Java

The essence of OOP rests on defining "Classes", and representations of the classes via objects.

Objectives

  • Each object possess a "State" and "Behavior".
  • Explaining Objects:
    • A class name can be used as a type to declare an object reference variable, the instance of the object will display properties
      • String str1 = "Object Type";
        • String in Java is a Class, str1 is a variable that is instantiated with a value "Object Type", which is a string.
    • Declaring object Class-Name typed-name-variable
    • Declaring an object alone "DOES NOT CREATE OBJECT"
    • Instantiation of ( realizing an object with a value ) variable, after declaration, is needed to create and use an object.
Step: 1 Create a file with your script editor or simple notepad

Use this Code : HelloObject1.java.txt

Step:2 Compile and Run

Step 3: Analyzed
  • A class name can be used as a type to declare an object reference variable, the instance of the object will display properties
  • str1 is an Object Type