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oefremidisoefremidis
committedDec 11, 2021
generics and design patterns
1 parent 4f6858a commit 9c8010d

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16 files changed

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16 files changed

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‎java-path-core-despattern/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>java-path-core</artifactId>
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<groupId>gr.codelearn</groupId>
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<version>2021.1.0</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>java-path-core-despattern</artifactId>
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<properties>
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<maven.compiler.source>17</maven.compiler.source>
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<maven.compiler.target>17</maven.compiler.target>
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</properties>
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</project>

‎java-path-core-despattern/src/main/java/gr/codelearn/designpatterns/behavioral/AESEncryptionStrategy.java

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package gr.codelearn.designpatterns.behavioral;
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public class AESEncryptionStrategy implements EncryptionStrategy {
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@Override
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public String encryptData(String text) {
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return text.hashCode() + " " + "AES".hashCode() ;
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}
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}

‎java-path-core-despattern/src/main/java/gr/codelearn/designpatterns/behavioral/EncryptionStrategy.java

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package gr.codelearn.designpatterns.behavioral;
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public interface EncryptionStrategy {
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String encryptData(String text);
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}

‎java-path-core-despattern/src/main/java/gr/codelearn/designpatterns/behavioral/Encryptor.java

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package gr.codelearn.designpatterns.behavioral;
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public class Encryptor {
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private EncryptionStrategy strategy;
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public void setStrategy(EncryptionStrategy strategy){
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this.strategy = strategy;
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}
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public String encrypt(String plainText){
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return strategy.encryptData(plainText);
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}
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}

‎java-path-core-despattern/src/main/java/gr/codelearn/designpatterns/behavioral/Main.java

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package gr.codelearn.designpatterns.behavioral;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Main {
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private static final Logger logger = LoggerFactory.getLogger(Main.class);
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public static void main(String[] args) {
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Encryptor encryptor = new Encryptor();
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EncryptionStrategy aesStrategy = new AESEncryptionStrategy();
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EncryptionStrategy rsaStrategy = new RSAEncryptionStrategy();
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encryptor.setStrategy(aesStrategy);
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logger.info("{}", encryptor.encrypt("This is a text"));
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encryptor.setStrategy(rsaStrategy);
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logger.info("{}", encryptor.encrypt("This is a text"));
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}
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}

‎java-path-core-despattern/src/main/java/gr/codelearn/designpatterns/behavioral/RSAEncryptionStrategy.java

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package gr.codelearn.designpatterns.behavioral;
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public class RSAEncryptionStrategy implements EncryptionStrategy {
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@Override
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public String encryptData(String text) {
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return text.hashCode() + " " + "RSA".hashCode() ;
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}
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}

‎java-path-core-despattern/src/main/java/gr/codelearn/designpatterns/creational/EagerSingleton.java

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package gr.codelearn.designpatterns.creational;
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public class EagerSingleton {
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private static final EagerSingleton INSTANCE = new EagerSingleton();
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private EagerSingleton(){}
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public static EagerSingleton getInstance(){
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return INSTANCE;
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}
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}

‎java-path-core-despattern/src/main/java/gr/codelearn/designpatterns/creational/LazySingleton.java

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package gr.codelearn.designpatterns.creational;
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public class LazySingleton {
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private static LazySingleton instance = null;
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private LazySingleton(){}
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public synchronized static LazySingleton getInstance(){
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if (instance == null){
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instance = new LazySingleton();
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}
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return instance;
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}
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}

‎java-path-core-despattern/src/main/java/gr/codelearn/designpatterns/creational/Main.java

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package gr.codelearn.designpatterns.creational;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Main {
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private static final Logger logger = LoggerFactory.getLogger(Main.class);
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public static void main(String[] args) {
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ScoreTracker scoreTracker = ScoreTracker.getInstance();
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logger.info("{}", scoreTracker.getScore());
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scoreTracker.increaseScore(10);
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logger.info("{}", scoreTracker.getScore());
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scoreTracker = ScoreTracker.getInstance();
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logger.info("{}", scoreTracker.getScore());
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}
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}

‎java-path-core-despattern/src/main/java/gr/codelearn/designpatterns/creational/ScoreTracker.java

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package gr.codelearn.designpatterns.creational;
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public class ScoreTracker {
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private static ScoreTracker instance = null;
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private int score = 0;
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private ScoreTracker(){}
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public static ScoreTracker getInstance(){
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if (instance == null){
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instance = new ScoreTracker();
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}
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return instance;
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}
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public void increaseScore(int number){
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score += number;
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}
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public int getScore(){
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return score;
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}
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}

‎java-path-core-despattern/src/main/resources/log4j2.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<Configuration status="WARN" monitorInterval="30">
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<Properties>
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<Property name="LOG_PATTERN">
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%d{yyyy-MM-dd HH:mm:ss.SSS} %5p ${hostName} - [%15.15t] %-30.30c{1.} : %m%n%ex
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</Property>
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</Properties>
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<Appenders>
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<Console name="ConsoleAppender" target="SYSTEM_OUT" follow="true">
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<PatternLayout pattern="${LOG_PATTERN}"/>
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</Console>
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<!-- Rolling Random Access File Appender with a default buffer of 256 * 1024 bytes -->
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<RollingRandomAccessFile name="RollingRandomAccessFileAppender"
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fileName="logs/java-path-core-despattern.log"
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filePattern="logs/java-path-core-despattern-%d{yyyy-MM-dd}.zip">
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<PatternLayout>
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<Pattern>${LOG_PATTERN}</Pattern>
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</PatternLayout>
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<Policies>
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<TimeBasedTriggeringPolicy/>
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</Policies>
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<DefaultRolloverStrategy>
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<Delete basePath="logs">
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<IfLastModified age="30d"/>
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</Delete>
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</DefaultRolloverStrategy>
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</RollingRandomAccessFile>
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</Appenders>
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<Loggers>
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<AsyncLogger name="gr.codelearn" level="debug" additivity="false">
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<AppenderRef ref="ConsoleAppender"/>
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<AppenderRef ref="RollingRandomAccessFileAppender"/>
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</AsyncLogger>
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<Root level="info">
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<AppenderRef ref="ConsoleAppender"/>
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<AppenderRef ref="RollingRandomAccessFileAppender"/>
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</Root>
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</Loggers>
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</Configuration>

‎java-path-core.generics/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>java-path-core</artifactId>
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<groupId>gr.codelearn</groupId>
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<version>2021.1.0</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>java-path-core.generics</artifactId>
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<properties>
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<maven.compiler.source>17</maven.compiler.source>
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<maven.compiler.target>17</maven.compiler.target>
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</properties>
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</project>

‎java-path-core.generics/src/main/java/gr/codelearn/generics/Main.java

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package gr.codelearn.generics;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.ArrayList;
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import java.util.List;
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public class Main {
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private static final Logger logger = LoggerFactory.getLogger(Main.class);
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public static void main(String[] args) {
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// customGeneric();
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// logger.info("{}", genericMethod(5));
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// upperBound();
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lowerBound();
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ArrayList a = new ArrayList();
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}
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public static void lowerBound(){
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List<Integer> intList = new ArrayList<>();
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intList.add(5); intList.add(15); intList.add(25);
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List<Double> doubleList = new ArrayList<>();
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doubleList.add(3.5); doubleList.add(23.53); doubleList.add(34.45);
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List<Number> numberList = new ArrayList<>();
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numberList.add(3.5); numberList.add(23); numberList.add(45f);
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List<? super Integer> lowerBoundList;
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lowerBoundList = intList;
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lowerBoundList = numberList;
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// lowerBoundList = doubleList; // compilation error
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}
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public static void upperBound(){
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List<Integer> intList = new ArrayList<>();
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intList.add(5); intList.add(15); intList.add(25);
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List<Double> doubleList = new ArrayList<>();
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doubleList.add(3.5); doubleList.add(23.53); doubleList.add(34.45);
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logger.info("{}", avg(intList));
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logger.info("{}", avg(doubleList));
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}
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private static double avg(List<? extends Number> numbers){
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double av = 0;
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for (int i = 0; i < numbers.size() ; i++) {
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av += numbers.get(i).doubleValue();
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}
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return av/numbers.size();
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}
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private static void customGeneric() {
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Process<Integer, Double> mangProcess = new Process<>(1, "print", 2013, 8.9);
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Process<String, Integer> sysProcess = new Process("admin1", "print", 2013, 9);
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logger.info("{}", mangProcess);
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logger.info("{}", sysProcess);
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}
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}

‎java-path-core.generics/src/main/java/gr/codelearn/generics/Process.java

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package gr.codelearn.generics;
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public class Process<T, S> {
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private T pid;
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private String pname;
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private int releasedYear;
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private S runningTime;
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public Process(T pid, String pname, int releasedYear, S runningTime) {
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this.pid = pid;
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this.pname = pname;
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this.releasedYear = releasedYear;
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this.runningTime = runningTime;
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}
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@Override
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public String toString() {
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return "Process{" + "pid=" + pid + ", pname='" + pname + '\'' + ", releasedYear=" + releasedYear +
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", runningTime=" + runningTime + '}';
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}
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}

‎java-path-core.generics/src/main/resources/log4j2.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<Configuration status="WARN" monitorInterval="30">
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<Properties>
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<Property name="LOG_PATTERN">
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%d{yyyy-MM-dd HH:mm:ss.SSS} %5p ${hostName} - [%15.15t] %-30.30c{1.} : %m%n%ex
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</Property>
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</Properties>
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<Appenders>
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<Console name="ConsoleAppender" target="SYSTEM_OUT" follow="true">
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<PatternLayout pattern="${LOG_PATTERN}"/>
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</Console>
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<!-- Rolling Random Access File Appender with a default buffer of 256 * 1024 bytes -->
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<RollingRandomAccessFile name="RollingRandomAccessFileAppender"
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fileName="logs/java-path-core-generics.log"
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filePattern="logs/java-path-core-generics-%d{yyyy-MM-dd}.zip">
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<PatternLayout>
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<Pattern>${LOG_PATTERN}</Pattern>
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</PatternLayout>
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<Policies>
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<TimeBasedTriggeringPolicy/>
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</Policies>
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<DefaultRolloverStrategy>
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<Delete basePath="logs">
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<IfLastModified age="30d"/>
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</Delete>
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</DefaultRolloverStrategy>
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</RollingRandomAccessFile>
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</Appenders>
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<Loggers>
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<AsyncLogger name="gr.codelearn" level="debug" additivity="false">
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<AppenderRef ref="ConsoleAppender"/>
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<AppenderRef ref="RollingRandomAccessFileAppender"/>
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</AsyncLogger>
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<Root level="info">
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<AppenderRef ref="ConsoleAppender"/>
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<AppenderRef ref="RollingRandomAccessFileAppender"/>
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</Root>
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</Loggers>
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</Configuration>

‎pom.xml

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<module>java-path-core-oop</module>
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<module>java-path-core-databases</module>
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<module>java-path-core-exceptions</module>
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<module>java-path-core-despattern</module>
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<module>java-path-core.generics</module>
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</modules>
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<!-- Properties/Variables -->

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