Objects in software is a bundle that contains state and behavior .We use objects in our daily lives Example of objects are- Dog Des...
Objects in software is a bundle that contains state and behavior.We use objects in our daily lives Example of objects are-
- Dog
- Desk
- Car etc.
All objects have to characteristics:
- State –Eg Cow- has(name,color,breed etc)
- Behaviour-Eg Car has behavior like (changing gear, four wheel drive, apply breaks etc.)
Importance of bundling software objects
- Modularity-it’s easy to write and maintain object code.These objects can be passed around the system easily.
- Information hiding-Because users interact with objects, it's easy to hide internal implementation of a software.
- Enables code reuse-it’s easy to reuse objects once created.
- Easy to debug-if a certain object does not work properly, its easy to remove that object.
How to create a Class Object
Creating a class object is just easy. You just need to use new keyword then call the class constructor.Example.
/**
*
* @author Eric
* www.techoverload.net
* How to create class object
*/
public class Employees {
//class instance variables
public int id;
public String name;
public String address;
public int age;
//class setter and getter methods
public void setAge(int employeeAge)
{
age=employeeAge;
}
public void setName(String employeeName)
{
name=employeeName;
}
public void setAddress(String employeeAddress)
{
address=employeeAddress;
}
public void setId(int employeeId)
{
id=employeeId;
}
public int getId()
{
id=this.id;
return id;
}
public int getAge()
{
age=this.age;
return age;
}
public String getName()
{
name=this.name;
return name;
}
public String getAddress()
{
address=this.address;
return address;
}
//Static main method
public static void main(String args[])
{
//creating class object using class constructor
Employees em=new Employees();
em.setAge(23);
em.setAddress("PO BOX 11 Mombasa");
em.setId(234532345);
em.setName("Mellisa");
System.out.println("ID " +em.id);
System.out.println("Age " +em.age);
System.out.println("Name " +em.name);
System.out.println("Address " +em.address);
}
}
