Class and Objects in Java

Class

• user-defined blueprint in OOP
• a common set of properties are represented by class
• To create a class, you need to use the keyword class

Example:
Class named “Test” is created below
public class Test {
int x=17;
}

• Class describes state and behavior

Remember, class is blueprint form where individual objects are generated

Example

public classCat {
   String breed;
   int age;
   String color;

   void mew() {
   }

   void sleep() {
   }

   void run() {
   }

Object

• the basic unit of OOP
• real-life entities are represented by the object
• In java, an object is created from a class
• Objects have state and behaviour. For example, a cat has a state and behaviour
  • States like: Color, name, breed of the cat
  • Behaviour like: mewing, moving tail etc