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Multi level hierarchy                        http://improvejava.blogspot.in   1
ObjectivesOn completion of this period, you would beable to know  • Multi level inheritance hierarchy  • To create multi l...
RecapSuper key word• When ever a subclass needs to refer to it’s  immediate upper class it can do so by using  super keywo...
Multi Level Inheritance HierarchyOne can build hierarchies that contain as many layers of inheritances as one likeGiven ...
Multi Level Inheritance Hierarchy contd..• With the above description each subclassinherits all the properties found in al...
Multi Level Inheritance Hierarchy contd..A derived class with multilevel base classes is declared asfollows class A{ -----...
Discussion• Can you give any real life example for multi level  inheritance hierarchy• Employee – Manager – Clerk – WagedE...
Discussion contd..• Can you give any software example for multi level  inheritance hierarchy• Shape – Rectangle – Circle –...
Program To Create Multi Level Hierarchy  • Consider the following example  • Add a class Shipment to the class BoxWeight  ...
Program To Create Multi Level Hierarchy contd..   class Box{    private double width;    private double height;    private...
Program To Create Multi Level Hierarchy contd..  //Constructor used when all dimensions specified  Box(double w, double h,...
Program To Create Multi Level Hierarchy contd..// constructor used when no dimensions specifiedBox(){width = -1;       // ...
Program To Create Multi Level Hierarchy contd.. // Compute and return volume  double volume() {  return width * height * d...
Program To Create Multi Level Hierarchy contd..   super(ob);   weight = ob.weight;   }  // constructor when all parameters...
Program To Create Multi Level Hierarchy contd..         // constructor used when cube is created         BoxWeight( double...
Program To Create Multi Level Hierarchy contd..  // Add shipping costs  class Shipment extends BoxWeight {      double cos...
Program To Create Multi Level Hierarchy contd..    // constructor when all parameters are specified Shipment(double w, dou...
Program To Create Multi Level Hierarchy contd..  class DemoShipment {  public static void main( String args[]) {  double v...
Program To Create Multi Level Hierarchy contd..     vol = shipment2.volume();     System.out.println( “Volume of shipment2...
Output of programVolume of shipment1 is 3000.0Weight of shipment1 is 10.0Shipping cost : $3.41Volume of shipment2 is 24.0W...
Summary• In this class we have discussed  • Multi level hierarchy  • Creating multi level hierarchy                   http...
Quiz1.   A     B     CThe above figure depictsa) Single Inheritanceb) Hierarchical inheritancec) Multilevel inheritance   ...
Frequently Asked Questions1.   What is multi level hierarchy ?2. Explain how to create a multilevel hierarchy   with an ex...
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Multi level hierarchy

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Transcript of "Multi level hierarchy"

  1. 1. Multi level hierarchy http://improvejava.blogspot.in 1
  2. 2. ObjectivesOn completion of this period, you would beable to know • Multi level inheritance hierarchy • To create multi level inheritance hierarchy http://improvejava.blogspot.in 2
  3. 3. RecapSuper key word• When ever a subclass needs to refer to it’s immediate upper class it can do so by using super keyword http://improvejava.blogspot.in 3
  4. 4. Multi Level Inheritance HierarchyOne can build hierarchies that contain as many layers of inheritances as one likeGiven three classes A,B,C C can be sub class of B, which is a sub class of A A A : super class to B B B : sub class of A, super class of C C C : subclass of B and A Fig. 24.1. Multi level hierarchy http://improvejava.blogspot.in 4
  5. 5. Multi Level Inheritance Hierarchy contd..• With the above description each subclassinherits all the properties found in all of its superclass• In the above diagram caseC inherits all aspects of B and A http://improvejava.blogspot.in 5
  6. 6. Multi Level Inheritance Hierarchy contd..A derived class with multilevel base classes is declared asfollows class A{ -------- --------}class B extends A // first level{ ------ ------}class C extends B // second level{ ------- --------- http://improvejava.blogspot.in 6}
  7. 7. Discussion• Can you give any real life example for multi level inheritance hierarchy• Employee – Manager – Clerk – WagedEmployee• Manager – AccountsDepartment• Manager – IT Department Employee• Manger - HRD Manger Clerk WagedEmployee Accounts Department IT Department HRD Fig. 24.2. Real life example fro multi level hierarchy http://improvejava.blogspot.in 7
  8. 8. Discussion contd..• Can you give any software example for multi level inheritance hierarchy• Shape – Rectangle – Circle – Triangle• Rectangle – Square - RoundedRectangle Shape Rectangle Circle Traingle RoundedRectang Square le Fig. 24.3. Software example fro multi level hierarchy http://improvejava.blogspot.in 8
  9. 9. Program To Create Multi Level Hierarchy • Consider the following example • Add a class Shipment to the class BoxWeight which is a sub class of Box Box Box : Super class BoxWeight BoxWeight : Subclass to Box class super to shipment Shipment Shipment : Newly added sub class to BoxWeightFig. 24.4. Example on Multi level Hierarchy http://improvejava.blogspot.in 9
  10. 10. Program To Create Multi Level Hierarchy contd.. class Box{ private double width; private double height; private double depth; // construct clone of one object Box(Box ob) { // pass object to constructor width = ob.width; height = ob.height; depth = ob.depth; } http://improvejava.blogspot.in 10
  11. 11. Program To Create Multi Level Hierarchy contd.. //Constructor used when all dimensions specified Box(double w, double h, double d) { width = w; height = h; depth = d; } // constructor used when no dimensions specified Box(){ http://improvejava.blogspot.in 11
  12. 12. Program To Create Multi Level Hierarchy contd..// constructor used when no dimensions specifiedBox(){width = -1; // use -1 to indicate an uninitialized box height = -1; depth = -1;}// constructor used when a cube is createdBox(double len){ width = height = depth = len;} http://improvejava.blogspot.in 12
  13. 13. Program To Create Multi Level Hierarchy contd.. // Compute and return volume double volume() { return width * height * depth; } } // BoxWeight now fully implements all constructors. class BoxWeight extends Box { double weight; // weight box // construct clone of an object BoxWeight( BoxWeight ob) { // pass object to constructor http://improvejava.blogspot.in 13
  14. 14. Program To Create Multi Level Hierarchy contd.. super(ob); weight = ob.weight; } // constructor when all parameters are apecified BoxWeight ( double w, double h, double d, double m) { super(w,h,d); //call super class constructor weight = m; } // default constructor BoxWeight() { Super(); weight = -1; } http://improvejava.blogspot.in 14
  15. 15. Program To Create Multi Level Hierarchy contd.. // constructor used when cube is created BoxWeight( double len, double m) { super(len); weight = m; } } http://improvejava.blogspot.in 15
  16. 16. Program To Create Multi Level Hierarchy contd.. // Add shipping costs class Shipment extends BoxWeight { double cost; // construct clone of an object. Shipment(Shipment ob) { // pass object to constructor super(ob); cost = ob.cost; } http://improvejava.blogspot.in 16
  17. 17. Program To Create Multi Level Hierarchy contd.. // constructor when all parameters are specified Shipment(double w, double h, double d, double m, double c) { super( w,h,d,m); //call superclass constructor cost = c; } //default constructor Shipment() { super(); cost = -1; } //constructor used when cube is created Shipment( double len, double m, double c) { super(len,m); } } http://improvejava.blogspot.in 17
  18. 18. Program To Create Multi Level Hierarchy contd.. class DemoShipment { public static void main( String args[]) { double vol; Shipment shipment1 = new Shipment(10,20,15,10,3.41); Shipment shipment2 = new Shipment(2,3,4,0.76,1.28); vol = shipment1.volume(); System.out.println( “Volume of shipment1 is ” + vol); System.out.println( “weight of shipment1 is” + shipment1.weight); System.out.println( “shipping cost : $” +shipment1.cost); System.out.println(); http://improvejava.blogspot.in 18
  19. 19. Program To Create Multi Level Hierarchy contd.. vol = shipment2.volume(); System.out.println( “Volume of shipment2 is ” + vol); System.out.println( “weight of shipment2 is” + shipment2.weight); System.out.println( “shipping cost : $” +shipment2.cost); System.out.println(); } } http://improvejava.blogspot.in 19
  20. 20. Output of programVolume of shipment1 is 3000.0Weight of shipment1 is 10.0Shipping cost : $3.41Volume of shipment2 is 24.0Weight of shipment2 is 0.76Shipping cost : $1.28 http://improvejava.blogspot.in 20
  21. 21. Summary• In this class we have discussed • Multi level hierarchy • Creating multi level hierarchy http://improvejava.blogspot.in 21
  22. 22. Quiz1. A B CThe above figure depictsa) Single Inheritanceb) Hierarchical inheritancec) Multilevel inheritance http://improvejava.blogspot.in 22
  23. 23. Frequently Asked Questions1. What is multi level hierarchy ?2. Explain how to create a multilevel hierarchy with an example program http://improvejava.blogspot.in 23
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