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Merge pull request #56 from KunwarVikas/stackandqueue

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Java Design Patterns
This commit is contained in:
javadevjournal
2022-05-21 17:28:12 -07:00
committed by GitHub
parent a56b37616f c83d39750b
commit 0165d0d8bc
18 changed files with 399 additions and 0 deletions
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16
com/javadevjournal/design/creational/prototype/Circle.java Normal file
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package javadevjournal.design.creational.prototype;
/**
* @author Kunwar
*/
public class Circle extends Shape {
public Circle() {
type = "Circle";
}
@Override
public void draw() {
System.out.println("Circle's draw() method.");
}
}

19
com/javadevjournal/design/creational/prototype/PrototypePatternDemo.java Normal file
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package javadevjournal.design.creational.prototype;
/**
* @author Kunwar
*/
public class PrototypePatternDemo {
public static void main(String[] args) {
ShapeCache.loadCache();
Shape clonedShape = (Shape) ShapeCache.getShape("1");
System.out.println("Shape : " + clonedShape.getType());
Shape clonedShape2 = (Shape) ShapeCache.getShape("2");
System.out.println("Shape : " + clonedShape2.getType());
Shape clonedShape3 = (Shape) ShapeCache.getShape("3");
System.out.println("Shape : " + clonedShape3.getType());
}
}

16
com/javadevjournal/design/creational/prototype/Rectangle.java Normal file
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package javadevjournal.design.creational.prototype;
/**
* @author Kunwar
*/
public class Rectangle extends Shape {
public Rectangle() {
type = "Rectangle";
}
@Override
public void draw() {
System.out.println("Rectangle's draw() method.");
}
}

39
com/javadevjournal/design/creational/prototype/Shape.java Normal file
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package javadevjournal.design.creational.prototype;
/**
* @author Kunwar
*/
public abstract class Shape implements Cloneable {
private String id;
protected String type;
abstract void draw();
public String getType() {
return type;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
/**
* Use Object class's Clone() method to do the cloning.
*
* @return
*/
public Object clone() {
Object cloneObject = null;
try {
cloneObject = super.clone();
} catch (CloneNotSupportedException e) {
System.out.println("cloning failed");
e.printStackTrace();
}
return cloneObject;
}
}

42
com/javadevjournal/design/creational/prototype/ShapeCache.java Normal file
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package javadevjournal.design.creational.prototype;
import java.util.HashMap;
import java.util.Map;
/**
* @author Kunwar
*/
public class ShapeCache {
private static Map<String, Shape> shapeMap = new HashMap<String, Shape>();
/**
* Return cloned object of Shape class implementing classes.
*
* @param shapeId
* @return
*/
public static Shape getShape(String shapeId) {
Shape toBeClonedShape = shapeMap.get(shapeId);
return (Shape) toBeClonedShape.clone();
}
/**
* In real-world applications, the loading of details will be from a Database.
* We are using a HaspMap to demonstrate the same behavior.
*/
public static void loadCache() {
Circle circle = new Circle();
circle.setId("1");
shapeMap.put(circle.getId(), circle);
Square square = new Square();
square.setId("2");
shapeMap.put(square.getId(), square);
Rectangle rectangle = new Rectangle();
rectangle.setId("3");
shapeMap.put(rectangle.getId(), rectangle);
}
}

16
com/javadevjournal/design/creational/prototype/Square.java Normal file
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package javadevjournal.design.creational.prototype;
/**
* @author Kunwar
*/
public class Square extends Shape {
public Square() {
type = "Square";
}
@Override
public void draw() {
System.out.println("Square's draw() method.");
}
}

12
com/javadevjournal/design/structural/decorator/Circle.java Normal file
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package javadevjournal.design.structural.decorator;
/**
* @author Kunwar
*/
public class Circle implements Shape {
@Override
public void drawShape() {
System.out.println("The shape is: Circle");
}
}

29
com/javadevjournal/design/structural/decorator/DecoratorPatternDemo.java Normal file
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package javadevjournal.design.structural.decorator;// DecoratorPatternDemo.java
/**
* @author Kunwar
*/
public class DecoratorPatternDemo {
public static void main(String[] args) {
// Creating objects of Shape interface
Shape circle = new Circle();
Shape rectangle = new Rectangle();
// Creating objects of decorated classes
Shape redCircle = new RedShapeDecorator(new Circle());
Shape redRectangle = new RedShapeDecorator(new Rectangle());
System.out.println("Circle with normal fill");
circle.drawShape();
System.out.println("Rectangle with normal fill");
rectangle.drawShape();
System.out.println("\nCircle of red fill");
redCircle.drawShape();
System.out.println("\nRectangle of red fill");
redRectangle.drawShape();
}
}

12
com/javadevjournal/design/structural/decorator/Rectangle.java Normal file
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package javadevjournal.design.structural.decorator;// Class 1
/**
* @author Kunwar
*/
public class Rectangle implements Shape {
@Override
public void drawShape() {
System.out.println("The shape is: Rectangle");
}
}

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com/javadevjournal/design/structural/decorator/RedShapeDecorator.java Normal file
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package javadevjournal.design.structural.decorator;
/**
* @author Kunwar
*/
public class RedShapeDecorator extends ShapeDecorator {
public RedShapeDecorator(Shape decoratedShape) {
super(decoratedShape);
}
@Override
public void drawShape() {
decoratedShape.drawShape();
//additional method to change the behavior of the shape object
shapeFill(decoratedShape);
}
/**
* This method will change the behavior of the shape object at runtime.
*
* @param decoratedShape
*/
private void shapeFill(Shape decoratedShape) {
System.out.println("Shape Fill color: Red");
}
}

8
com/javadevjournal/design/structural/decorator/Shape.java Normal file
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package javadevjournal.design.structural.decorator;
/**
* @author Kunwar
*/
public interface Shape {
void drawShape();
}

19
com/javadevjournal/design/structural/decorator/ShapeDecorator.java Normal file
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package javadevjournal.design.structural.decorator;
/**
* @author Kunwar
*/
public abstract class ShapeDecorator implements Shape {
//protected object of Shape Interface.
protected Shape decoratedShape;
public ShapeDecorator(Shape decoratedShape) {
this.decoratedShape = decoratedShape;
}
//calling the drawShape method on decoratedShape
public void drawShape() {
decoratedShape.drawShape();
}
}

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com/javadevjournal/design/structural/facade/FacadePatternClient.java Normal file
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package javadevjournal.design.structural.facade;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
/**
* @author Kunwar
*/
public class FacadePatternClient {
private static int choice;
public static void main(String args[]) throws NumberFormatException, IOException {
do {
System.out.print("========= Mobile Shop ============ \n");
System.out.print("1. IPHONE. \n");
System.out.print("2. SAMSUNG. \n");
System.out.print("3. NOKIA. \n");
System.out.print("4. Exit. \n");
System.out.print("Enter your choice: ");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
choice = Integer.parseInt(br.readLine());
ShopKeeper shopKeeper = new ShopKeeper();
switch (choice) {
case 1: {
shopKeeper.iphonePhoneSale();
}
break;
case 2: {
shopKeeper.samsungPhoneSale();
}
break;
case 3: {
shopKeeper.nokiaPhoneSale();
}
break;
default: {
System.out.println("Nothing You purchased");
}
return;
}
} while (choice != 4);
}
}

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com/javadevjournal/design/structural/facade/IMobileShop.java Normal file
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package javadevjournal.design.structural.facade;
/**
* @author Kunwar
*/
public interface IMobileShop {
/**
* Mobile Model Number
*/
public void getMobileModelNumber();
/**
* Mobile Price
*/
public void getMobilePrice();
}

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com/javadevjournal/design/structural/facade/Iphone.java Normal file
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package javadevjournal.design.structural.facade;
/**
* @author Kunwar
*/
public class Iphone implements IMobileShop {
@Override
public void getMobileModelNumber() {
System.out.println("The model is: IPhone 13");
}
@Override
public void getMobilePrice() {
System.out.println("The price is: 75000INR ");
}
}

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com/javadevjournal/design/structural/facade/Nokia.java Normal file
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package javadevjournal.design.structural.facade;
/**
* @author Kunwar
*/
public class Nokia implements IMobileShop {
@Override
public void getMobileModelNumber() {
System.out.println("The model is: Nokia 1100");
}
@Override
public void getMobilePrice() {
System.out.println("The price is: 1500INR ");
}
}

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com/javadevjournal/design/structural/facade/Samsung.java Normal file
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package javadevjournal.design.structural.facade;
/**
* @author Kunwar
*/
public class Samsung implements IMobileShop {
@Override
public void getMobileModelNumber() {
System.out.println("The model is: Galaxy 11");
}
@Override
public void getMobilePrice() {
System.out.println("The price is: 85000INR ");
}
}

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com/javadevjournal/design/structural/facade/ShopKeeper.java Normal file
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package javadevjournal.design.structural.facade;
/**
* @author Kunwar
*/
public class ShopKeeper {
private IMobileShop iphone;
private IMobileShop samsung;
private IMobileShop nokia;
/**
* no args constructor
*/
public ShopKeeper() {
iphone = new Iphone();
samsung = new Samsung();
nokia = new Nokia();
}
public void iphonePhoneSale() {
iphone.getMobileModelNumber();
iphone.getMobilePrice();
}
public void samsungPhoneSale() {
samsung.getMobileModelNumber();
samsung.getMobilePrice();
}
public void nokiaPhoneSale() {
nokia.getMobileModelNumber();
nokia.getMobilePrice();
}
}