Question

Create a Java class with two subclasses (children). Each class should have at least one attribute and a method. Parent class should have the attribute/method that is common to both children and children should have the attribute/method that is unique to what they represent. Write the main method to demonstrate the correct functionality of the code and to demonstrate that the children inherit from the parent class. 

Answer 1

//This is ParentClass.java class 
public class ParentClass {
//This is the attribute of parent class
int p=10;

//This is the printValue() method, it is available in ParentClass
public void printValue() {
 System.out.println("This is the parent class, the value of p is :: "+p);
}//printValue()

}//ParentClass(end of the class)

 

 

 

//This is FirstChildClass.java class that extends ParentClass
public class FirstChildClass extends ParentClass{

//This is the attribute of FirstChildClass class
int c1=20;

//This is the printValue() method, it is available in FirstChildClass
public void printValue() {
 System.out.println("This is the FirstChild class, the value of c1 is :: "+c1);
}//printValue()

}//FirstChildClass(end of class)
 

 

 

 

//This is SecondChildClass.java class that extends ParentClass
public class SecondChildClass extends ParentClass{

//This is the attribute of SecondChildClass class
int c2=30;

//This is the printValue() method, it is available in SecondChildClass
public  void printValue() {
 System.out.println("This is the SecondChild class, the value of c2 is :: "+c2);
}//printValue()
 
}//SecondChildClass(end of class)
 

 

 

 

 

//This is TestParentChildRelation.java class
//This class is responsible to test ParentClass, FirstChildClass and SecondChildClass
public class TestParentChildRelation {

// This is main() method, program execution start here
public static void main(String[] args) {
 //This is the object of Parent class
 ParentClass pc=new ParentClass();
 pc.printValue();
 
 //This is the object of FirstChildClass, that hold ParentClass reference variable(This is possible only inheritance)
 ParentClass pcc1=new FirstChildClass();
 pcc1.printValue();

 //This is the object of SecondChildClass, that hold ParentClass reference variable(This is possible only inheritance)
 ParentClass pcc2=new SecondChildClass();
 pcc2.printValue();
 
}// main() method

}// TestParentChildRelation(end of class)