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premaseempremaseem
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Strategy Design Pattern - Calculator application
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‎patternBonus/src/com/premaseem/Client.java‎

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‎patternBonus/src/com/premaseem/client/ClientMain.java‎

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package com.premaseem.client;
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/*
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@author: Aseem Jain
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@title: Design Patterns with Java 9
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@link: https://premaseem.wordpress.com/category/computers/design-patterns/
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*/
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import java.util.Scanner;
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import com.premaseem.strategy.AirthematicOperationStrategy;
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import com.premaseem.strategy.impl.AdditionStrategy;
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import com.premaseem.strategy.impl.MultiplicationStragegy;
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import com.premaseem.strategy.impl.SubstractionStrategy;
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public class ClientMain {
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public static void main (String[] args) {
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System.out.println("This is Calculator application designed using Strategy Pattern");
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System.out.println("Client has several Strategy which can be consumed at run time ");
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System.out.println("Please input 2 number for Strategic mathematical operation... ");
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Scanner scan = new Scanner(System.in);
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System.out.println("Please enter first number ");
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Integer num1 = scan.nextInt();
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System.out.println("Please enter second number");
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Integer num2 = scan.nextInt();
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System.out.println("ADD");
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System.out.println("SUB");
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System.out.println("MUL");
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// Initially Strategy is null, it would be assigned at run time
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AirthematicOperationStrategy strategy = null;
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System.out.println("Please enter OPERATION CODE, on the run time strategy would be picked based on your choice of operation");
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String operationCode = scan.next();
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// Family of different algorithm is getting initialised here
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if (operationCode.contains("ADD")) {
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strategy = new AdditionStrategy();
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}
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if (operationCode.contains("SUB")) {
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strategy = new SubstractionStrategy();
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}
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if (operationCode.contains("MUL")) {
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strategy = new MultiplicationStragegy();
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}
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System.out.printf("You picked strategy as %s", operationCode);
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System.out.println();
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if (strategy != null) {
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// Operation remains same but implementation algo changes dynamically
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System.out.printf("Final result is %d", strategy.performOperation(num1, num2));
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} else {
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System.out.println("Invalid operation picked :-( ");
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}
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System.out.println();
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System.out.println(" Thanks by Prem Aseem ");
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}
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}

‎patternBonus/src/com/premaseem/strategy/AirthematicOperationStrategy.java‎

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package com.premaseem.strategy;
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/*
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@author: Aseem Jain
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@title: Design Patterns with Java 9
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@link: https://premaseem.wordpress.com/category/computers/design-patterns/
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*/
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public interface AirthematicOperationStrategy {
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Integer performOperation (Integer num1, Integer num2);
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}

‎patternBonus/src/com/premaseem/strategy/impl/AdditionStrategy.java‎

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package com.premaseem.strategy.impl;
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/*
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@author: Aseem Jain
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@title: Design Patterns with Java 9
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@link: https://premaseem.wordpress.com/category/computers/design-patterns/
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*/
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import com.premaseem.strategy.AirthematicOperationStrategy;
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public class AdditionStrategy implements AirthematicOperationStrategy {
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@Override
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public Integer performOperation(Integer num1, Integer num2) {
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return num1 + num2;
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}
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}

‎patternBonus/src/com/premaseem/strategy/impl/MultiplicationStragegy.java‎

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package com.premaseem.strategy.impl;
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/*
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@author: Aseem Jain
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@title: Design Patterns with Java 9
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@link: https://premaseem.wordpress.com/category/computers/design-patterns/
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*/
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import com.premaseem.strategy.AirthematicOperationStrategy;
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public class MultiplicationStragegy implements AirthematicOperationStrategy {
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@Override
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public Integer performOperation(Integer num1, Integer num2) {
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return num1 * num2;
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}
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}

‎patternBonus/src/com/premaseem/strategy/impl/SubstractionStrategy.java‎

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package com.premaseem.strategy.impl;
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/*
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@author: Aseem Jain
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@title: Design Patterns with Java 9
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@link: https://premaseem.wordpress.com/category/computers/design-patterns/
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*/
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import com.premaseem.strategy.AirthematicOperationStrategy;
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public class SubstractionStrategy implements AirthematicOperationStrategy {
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@Override
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public Integer performOperation(Integer num1, Integer num2) {
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return num1 - num2;
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}
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}

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