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kunal-kushwahakunal-kushwaha
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oop 3
1 parent 634788a commit e194a7b

12 files changed

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‎lectures/17-oop/code/src/com/kunal/properties/inheritance/Box.java‎

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package com.kunal.properties.inheritance;
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public class Box {
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private double l;
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double h;
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double w;
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// double weight;
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static void greeting() {
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System.out.println("Hey, I am in Box class. Greetings!");
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}
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public double getL() {
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return l;
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}
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Box () {
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this.h = -1;
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this.l = -1;
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this.w = -1;
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}
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// cube
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Box (double side) {
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// super(); Object class
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this.w = side;
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this.l = side;
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this.h = side;
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}
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Box(double l, double h, double w) {
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System.out.println("Box class constructor");
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this.l = l;
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this.h = h;
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this.w = w;
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}
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Box(Box old) {
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this.h = old.h;
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this.l = old.l;
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this.w = old.w;
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}
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}

‎lectures/17-oop/code/src/com/kunal/properties/inheritance/BoxColor.java‎

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package com.kunal.properties.inheritance;
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public class BoxColor extends BoxWeight {
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}

‎lectures/17-oop/code/src/com/kunal/properties/inheritance/BoxPrice.java‎

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package com.kunal.properties.inheritance;
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public class BoxPrice extends BoxWeight{
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double cost;
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BoxPrice () {
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super();
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this.cost = -1;
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}
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BoxPrice(BoxPrice other) {
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super(other);
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this.cost = other.cost;
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}
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public BoxPrice(double l, double h, double w, double weight, double cost) {
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super(l, h, w, weight);
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this.cost = cost;
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}
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public BoxPrice(double side, double weight, double cost) {
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super(side, weight);
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this.cost = cost;
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}
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}

‎lectures/17-oop/code/src/com/kunal/properties/inheritance/BoxWeight.java‎

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package com.kunal.properties.inheritance;
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import java.util.ArrayList;
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public class BoxWeight extends Box{
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double weight;
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public BoxWeight() {
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this.weight = -1;
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}
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// @Override
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static void greeting() {
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System.out.println("Hey, I am in BoxWeight class. Greetings!");
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ArrayList list = new ArrayList();
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}
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BoxWeight (BoxWeight other) {
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super(other);
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weight = other.weight;
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}
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BoxWeight(double side, double weight) {
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super(side);
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this.weight = weight;
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}
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public BoxWeight(double l, double h, double w, double weight) {
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// used to initialise values present in parent class
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super(l, h, w); // what is this? call the parent class constructor
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// System.out.println(super.weight);
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this.weight = weight;
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}
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}

‎lectures/17-oop/code/src/com/kunal/properties/inheritance/Main.java‎

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package com.kunal.properties.inheritance;
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public class Main {
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public static void main(String[] args) {
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Box box1 = new Box(4.6, 7.9, 9.9);
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box1.getL();
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Box box2 = new Box(box1);
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// System.out.println(box1.w + " " + box1.h);
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// BoxWeight box3 = new BoxWeight();
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// BoxWeight box4 = new BoxWeight(2, 3, 4, 8);
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// System.out.println(box3.h + " " + box3.weight);
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// Box box5 = new BoxWeight(2, 3, 4, 8);
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// System.out.println(box5.w);
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// there are many variables in both parent and child classes
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// you are given access to variables that are in the ref type i.e. BoxWeight
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// hence, you should have access to weight variable
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// this also means, that the ones you are trying to access should be initialised
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// but here, when the obj itself is of type parent class, how will you call the constructor of child class
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// this is why error
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// BoxWeight box6 = new Box(2, 3, 4);
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// System.out.println(box6);
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// Box.greeting();
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BoxWeight box = new BoxWeight();
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BoxWeight.greeting(); // you can inherit but you cannot override
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}
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}

‎lectures/17-oop/code/src/com/kunal/properties/polymorphism/Circle.java‎

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package com.kunal.properties.polymorphism;
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public class Circle extends Shapes{
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// this will run when obj of Circle is created
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// hence it is overriding the parent method
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@Override // this is called annotation
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void area() {
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System.out.println("Area is pie * r * r");
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}
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}

‎lectures/17-oop/code/src/com/kunal/properties/polymorphism/Main.java‎

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package com.kunal.properties.polymorphism;
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public class Main {
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public static void main(String[] args) {
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Shapes shape = new Shapes();
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Shapes circle = new Circle();
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Shapes square = new Square();
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circle.area();
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}
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}

‎lectures/17-oop/code/src/com/kunal/properties/polymorphism/Numbers.java‎

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package com.kunal.properties.polymorphism;
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public class Numbers {
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double sum(double a, int b) {
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return a + b;
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}
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double sum(int a, int b) {
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return a + b;
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}
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int sum(int a, int b, int c) {
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return a + b + c;
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}
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public static void main(String[] args) {
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Numbers obj = new Numbers();
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obj.sum(2, 3);
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obj.sum(1, 3, 7);
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// obj.sum(4, 5, 6, 8);
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}
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}

‎lectures/17-oop/code/src/com/kunal/properties/polymorphism/ObjectPrint.java‎

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package com.kunal.properties.polymorphism;
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public class ObjectPrint {
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int num;
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public ObjectPrint(int num) {
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this.num = num;
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}
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@Override
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public String toString() {
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return "ObjectPrint{" +
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"num=" + num +
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'}';
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}
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public static void main(String[] args) {
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ObjectPrint obj = new ObjectPrint(54);
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System.out.println(obj);
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}
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}

‎lectures/17-oop/code/src/com/kunal/properties/polymorphism/Shapes.java‎

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package com.kunal.properties.polymorphism;
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public class Shapes {
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void area() {
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System.out.println("I am in shapes");
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}
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// Early binding: check notes
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// final void area() {
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// System.out.println("I am in shapes");
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// }
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}

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