Question

Java

In object-oriented programming, we speak of classes, instances, methods, and messages. Briefly define and give an example of each on a code segment. HTML Editora BIVA-A - IEI X X 5 = EDO NV 12pt - Paragrap

Answer 1

//CLASS is a blueprint using which we create objects .ex class resides in code segment .

//OBJECT is nothing but an instance of a class.ex objects reside in heap segment.

//METHOD(defination) is sequence of predefind instruction which we execute.

//MESSAGE is nothing but passing objects as parameter(to a methods)......

//------------------

class Student{
   private String name;
  
   public void setName(String n){
       name=n;
   }
  
   public void getName(){
       System.out.println(name);
   }
}

public class Test {
   public static void main(String[] args){
       String firstname= "Mark";
      
       Student s=new Student();
       s.setName(firstname); // method invocation with message passing
       s.getName(); //method invocation
      
   }
}

//-------------- in the above code example ----------------
// s.setName() is Method invocation, whereas passing parameter (firstname) is message passing
//Test and Students are two classes whereas s is object of Student class