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J11_00.java
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66 lines (52 loc) · 1.65 KB
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package chapter11;
/* J11_00.java */
/* Illustrating Effects of Inheritance */
class Student extends Object{ // Base class
int Roll; // friendly by default
String Name= new String(); // friendly by default
}
class Result extends Student {
float Mark;
void setData() {
Roll = 101; // Accessing inherited member
Name = "Masud"; // Accessing inherited member
Mark = 75.50f; // Accessing own member
}
void display() {
System.out.println("Roll is : " +Roll);
// Accessing inherited member
System.out.println("Name is : " +Name);
// Accessing inherited member
System.out.println("Mark is : " +Mark) ;
// Accessing own member
}
}
public class J11_00{
public static void main(String... args) {
Student S1 = new Student();
// Creating Base-class object
System.out.println("Accessing Base-Class Variables.....");
S1.Name = "Mosaddek Mahdi";
S1.Roll = 101;
System.out.println("S1.Name : " + S1.Name);
System.out.println("S1.Roll : " + S1.Roll);
System.out.println();
System.out.println("Accessing Derived-Class Variables.....");
Result R1 = new Result();
// Creating Derived-class object
R1.Name = "Muhaimin Munim";
R1.Roll = 102;
R1.Mark = 99.0f;
System.out.println("R1.Name : " + R1.Name);
System.out.println("R1.Roll : " + R1.Roll);
System.out.println("R1.Name : " + R1.Name);
System.out.println("\nAccessing Derived-Class Methods.....");
R1.setData();
R1.display();
System.out.println();
//S1.setData(); // Shows following Compile-time Error
// The method setData() is undefined for the type Student
// S1.display(); // Shows following Compile-time Error
// The method display() is undefined for the type Student
}
}