odas the last topic in this Chapter Exercises 1. What is the difference between
ID: 3701332 • Letter: O
Question
odas the last topic in this Chapter Exercises 1. What is the difference between the conceptual world and the real world? is it possible for a 2. Use examples to distinguish between the following 71 conceptual model to represent reality in total? Why or why not? a. an object type and an entity type b. an object and an entity c. a property and an attribute d. an entity and an entity instance e. an association and a relationship f. an object class and an entity class dnta tynes associated with attributes. nd n derived attribute?Explanation / Answer
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The conceptual world we can make into reality world.As shown in programatically.
Every concepts have some group of things.These things we can call as objects.
Objects can be grouped into class.
//Person is a class
class Person{
int age;//instance varible or a property or attribute
static int weight;
String color;
Person(){
System.out.println("Person class constrcutor");
}
public static void main(String[] args){
System.out.println("Person class main method");
}
}
//Employee is an entity class
class Employee extends Person {
Employee (){
System.out.println("Employee class constrcutor");
}
public static void main(String[] args){
Employee e1=new Employee();//e1 is the object of the class
System.out.println("Employeeclass main method");
}
}
output :
javac *.java
java Emplyee
Person class constrcutor
Employee class constrcutor
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