[BAEL-11401] - Moved articles out of core-java (part 2)

core-java/src/main/java/com/baeldung/heapdump/HeapDump.java

@@ -1,25 +0,0 @@
-package com.baeldung.heapdump;
-
-import com.sun.management.HotSpotDiagnosticMXBean;
-
-import javax.management.MBeanServer;
-
-import java.io.IOException;
-import java.lang.management.ManagementFactory;
-import java.nio.file.Paths;
-
-public class HeapDump {
-
-    public static void dumpHeap(String filePath, boolean live) throws IOException {
-        MBeanServer server = ManagementFactory.getPlatformMBeanServer();
-        HotSpotDiagnosticMXBean mxBean = ManagementFactory.newPlatformMXBeanProxy(
-          server, "com.sun.management:type=HotSpotDiagnostic", HotSpotDiagnosticMXBean.class);
-        mxBean.dumpHeap(filePath, live);
-    }
-
-    public static void main(String[] args) throws IOException {
-        String file = Paths.get("dump.hprof").toFile().getPath();
-
-        dumpHeap(file, true);
-    }
-}

core-java/src/main/java/com/baeldung/http/FullResponseBuilder.java

@@ -1,65 +0,0 @@
-package com.baeldung.http;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.Reader;
-import java.net.HttpURLConnection;
-import java.util.Iterator;
-import java.util.List;
-
-public class FullResponseBuilder {
-    public static String getFullResponse(HttpURLConnection con) throws IOException {
-        StringBuilder fullResponseBuilder = new StringBuilder();
-
-        fullResponseBuilder.append(con.getResponseCode())
-            .append(" ")
-            .append(con.getResponseMessage())
-            .append("\n");
-
-        con.getHeaderFields()
-            .entrySet()
-            .stream()
-            .filter(entry -> entry.getKey() != null)
-            .forEach(entry -> {
-
-                fullResponseBuilder.append(entry.getKey())
-                    .append(": ");
-
-                List<String> headerValues = entry.getValue();
-                Iterator<String> it = headerValues.iterator();
-                if (it.hasNext()) {
-                    fullResponseBuilder.append(it.next());
-
-                    while (it.hasNext()) {
-                        fullResponseBuilder.append(", ")
-                            .append(it.next());
-                    }
-                }
-
-                fullResponseBuilder.append("\n");
-            });
-
-        Reader streamReader = null;
-
-        if (con.getResponseCode() > 299) {
-            streamReader = new InputStreamReader(con.getErrorStream());
-        } else {
-            streamReader = new InputStreamReader(con.getInputStream());
-        }
-
-        BufferedReader in = new BufferedReader(streamReader);
-        String inputLine;
-        StringBuilder content = new StringBuilder();
-        while ((inputLine = in.readLine()) != null) {
-            content.append(inputLine);
-        }
-
-        in.close();
-
-        fullResponseBuilder.append("Response: ")
-            .append(content);
-
-        return fullResponseBuilder.toString();
-    }
-}

core-java/src/main/java/com/baeldung/http/ParameterStringBuilder.java

@@ -1,21 +0,0 @@
-package com.baeldung.http;
-
-import java.io.UnsupportedEncodingException;
-import java.net.URLEncoder;
-import java.util.Map;
-
-public class ParameterStringBuilder {
-    public static String getParamsString(Map<String, String> params) throws UnsupportedEncodingException {
-        StringBuilder result = new StringBuilder();
-
-        for (Map.Entry<String, String> entry : params.entrySet()) {
-            result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
-            result.append("=");
-            result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
-            result.append("&");
-        }
-
-        String resultString = result.toString();
-        return resultString.length() > 0 ? resultString.substring(0, resultString.length() - 1) : resultString;
-    }
-}

core-java/src/main/java/com/baeldung/jmx/Game.java

@@ -1,29 +0,0 @@
-package com.baeldung.jmx;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-public class Game implements GameMBean {
-
-    private static final Logger LOG = LoggerFactory.getLogger(Game.class);
-
-    private String playerName;
-
-    @Override
-    public void playFootball(String clubName) {
-        LOG.debug(this.playerName + " playing football for " + clubName);
-    }
-
-    @Override
-    public String getPlayerName() {
-        LOG.debug("Return playerName " + this.playerName);
-        return playerName;
-    }
-
-    @Override
-    public void setPlayerName(String playerName) {
-        LOG.debug("Set playerName to value " + playerName);
-        this.playerName = playerName;
-    }
-
-}

core-java/src/main/java/com/baeldung/jmx/GameMBean.java

@@ -1,11 +0,0 @@
-package com.baeldung.jmx;
-
-public interface GameMBean {
-
-    public void playFootball(String clubName);
-
-    public String getPlayerName();
-
-    public void setPlayerName(String playerName);
-
-}

core-java/src/main/java/com/baeldung/jmx/JMXTutorialMainlauncher.java

@@ -1,37 +0,0 @@
-package com.baeldung.jmx;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import javax.management.*;
-import java.lang.management.ManagementFactory;
-
-public class JMXTutorialMainlauncher {
-
-    private static final Logger LOG = LoggerFactory.getLogger(JMXTutorialMainlauncher.class);
-
-    public static void main(String[] args) {
-        // TODO Auto-generated method stub
-
-        LOG.debug("This is basic JMX tutorial");
-        ObjectName objectName = null;
-        try {
-            objectName = new ObjectName("com.baeldung.tutorial:type=basic,name=game");
-        } catch (MalformedObjectNameException e) {
-            e.printStackTrace();
-        }
-        MBeanServer server = ManagementFactory.getPlatformMBeanServer();
-        Game gameObj = new Game();
-        try {
-            server.registerMBean(gameObj, objectName);
-        } catch (InstanceAlreadyExistsException | MBeanRegistrationException | NotCompliantMBeanException e) {
-            e.printStackTrace();
-        }
-        LOG.debug("Registration for Game mbean with the platform server is successfull");
-        LOG.debug("Please open jconsole to access Game mbean");
-        while (true) {
-            // to ensure application does not terminate
-        }
-    }
-
-}

core-java/src/main/java/com/baeldung/memoryleaks/equalshashcode/Person.java

@@ -1,9 +0,0 @@
-package com.baeldung.memoryleaks.equalshashcode;
-
-public class Person {
-    public String name;
-     
-    public Person(String name) {
-        this.name = name;
-    }
-}

core-java/src/main/java/com/baeldung/memoryleaks/equalshashcode/PersonOptimized.java

@@ -1,25 +0,0 @@
-package com.baeldung.memoryleaks.equalshashcode;
-
-public class PersonOptimized {
-    public String name;
-     
-    public PersonOptimized(String name) {
-        this.name = name;
-    }
-     
-    @Override
-    public boolean equals(Object o) {
-        if (o == this) return true;
-        if (!(o instanceof PersonOptimized)) {
-            return false;
-        }
-        PersonOptimized person = (PersonOptimized) o;
-        return person.name.equals(name);
-    }
-     
-    @Override
-    public int hashCode() {
-        int result = 17;
-        result = 31 * result + name.hashCode();
-        return result;
-    }}

core-java/src/main/java/com/baeldung/memoryleaks/finalize/BulkyObject.java

@@ -1,32 +0,0 @@
-package com.baeldung.memoryleaks.finalize;
-
-import java.nio.charset.Charset;
-import java.util.Random;
-
-public class BulkyObject {
-    private String data[];
-    
-    public BulkyObject() {
-        data = new String[1000000];
-        
-        for(int i=0; i<1000000; i++) {
-            data[i] = getRandomString();
-        }
-    }
-    
-    private String getRandomString() {
-        byte[] array = new byte[1000];
-        new Random().nextBytes(array);
-        return new String(array, Charset.forName("UTF-8"));
-    }
-    
-    @Override
-    public void finalize() {
-        try {
-            Thread.sleep(100);
-        } catch (InterruptedException e) {
-            e.printStackTrace();
-        }
-        System.out.println("Finalizer called");
-    }
-}

core-java/src/main/java/com/baeldung/memoryleaks/finalize/BulkyObjectOptimized.java

@@ -1,22 +0,0 @@
-package com.baeldung.memoryleaks.finalize;
-
-import java.nio.charset.Charset;
-import java.util.Random;
-
-public class BulkyObjectOptimized {
-    private String data[];
-    
-    public BulkyObjectOptimized() {
-        data = new String[1000000];
-        
-        for(int i=0; i<1000000; i++) {
-            data[i] = getRandomString();
-        }
-    }
-    
-    private String getRandomString() {
-        byte[] array = new byte[1000];
-        new Random().nextBytes(array);
-        return new String(array, Charset.forName("UTF-8"));
-    }
-}

core-java/src/main/java/com/baeldung/memoryleaks/innerclass/BulkyObject.java

@@ -1,22 +0,0 @@
-package com.baeldung.memoryleaks.innerclass;
-
-import java.nio.charset.Charset;
-import java.util.Random;
-
-public class BulkyObject {
-    private String data[];
-    
-    public BulkyObject() {
-        data = new String[1000000];
-        
-        for(int i=0; i<1000000; i++) {
-            data[i] = getRandomString();
-        }
-    }
-    
-    private String getRandomString() {
-        byte[] array = new byte[1000];
-        new Random().nextBytes(array);
-        return new String(array, Charset.forName("UTF-8"));
-    }
-}

core-java/src/main/java/com/baeldung/memoryleaks/innerclass/InnerClassDriver.java

@@ -1,17 +0,0 @@
-package com.baeldung.memoryleaks.innerclass;
-
-public class InnerClassDriver {
-    public static InnerClassWrapper.SimpleInnerClass getSimpleInnerClassObj() {
-        return new InnerClassWrapper().new SimpleInnerClass();
-    }
-    
-    public static void main2(String[] args) {
-        InnerClassWrapper.SimpleInnerClass simpleInnerClassObj = getSimpleInnerClassObj();
-        System.out.println("Debug point");
-    }
-    
-    public static void main(String[] args) {
-        StaticNestedClassWrapper.StaticNestedClass simpleInnerClassObj = new StaticNestedClassWrapper.StaticNestedClass();
-        System.out.println("Debug point");
-    }
-}

core-java/src/main/java/com/baeldung/memoryleaks/innerclass/InnerClassWrapper.java

@@ -1,10 +0,0 @@
-package com.baeldung.memoryleaks.innerclass;
-
-
-public class InnerClassWrapper {
-    private BulkyObject bulkyObject = new BulkyObject();
-    
-    public class SimpleInnerClass {
-        
-    }
-}

core-java/src/main/java/com/baeldung/memoryleaks/innerclass/StaticNestedClassWrapper.java

@@ -1,10 +0,0 @@
-package com.baeldung.memoryleaks.innerclass;
-
-
-public class StaticNestedClassWrapper {
-    private BulkyObject bulkyObject = new BulkyObject();
-    
-    public static class StaticNestedClass {
-        
-    }
-}

core-java/src/main/java/com/baeldung/memoryleaks/internedstrings/InternedString.java

@@ -1,17 +0,0 @@
-package com.baeldung.memoryleaks.internedstrings;
-
-public class InternedString {
-    private static final String FILEPATH = "C:\\bigstring.txt";
-    
-    public void readString() {
-        String s1 = ReadStringFromFileUtil.read(FILEPATH).intern();
-        String s2 = ReadStringFromFileUtil.read(FILEPATH).intern();
-
-        if (s1 == s2) {
-            System.out.println("Both the strings objects are same");
-        }
-        else {
-            System.out.println("Both the strings objects are different");
-        }
-    }
-}

core-java/src/main/java/com/baeldung/memoryleaks/internedstrings/ReadStringFromFileUtil.java

@@ -1,34 +0,0 @@
-package com.baeldung.memoryleaks.internedstrings;
-
-import java.io.BufferedReader;
-import java.io.FileReader;
-import java.io.IOException;
-
-public class ReadStringFromFileUtil {
-
-    public static String read(String fileName) {
-        BufferedReader br = null;
-        try {
-            br = new BufferedReader(new FileReader(fileName));
-            StringBuilder sb = new StringBuilder();
-            String line = br.readLine();
-
-            while (line != null) {
-                sb.append(line);
-                sb.append("\n");
-                line = br.readLine();
-            }
-            return sb.toString();
-        } catch (IOException e) {
-            e.printStackTrace();
-        } finally {
-            try {
-                br.close();
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-        return null;
-    }
-
-}

core-java/src/main/java/com/baeldung/memoryleaks/internedstrings/StringObject.java

@@ -1,17 +0,0 @@
-package com.baeldung.memoryleaks.internedstrings;
-
-public class StringObject {
-    private static final String FILEPATH = "C:\\bigstring.txt";
-    
-    public void readString() {
-        String s1 = ReadStringFromFileUtil.read(FILEPATH);
-        String s2 = ReadStringFromFileUtil.read(FILEPATH);
-
-        if (s1 == s2) {
-            System.out.println("Both the strings objects are same");
-        }
-        else {
-            System.out.println("Both the strings objects are different");
-        }
-    }
-}

core-java/src/main/java/com/baeldung/memoryleaks/staticfields/NonStaticFieldsDemo.java

@@ -1,21 +0,0 @@
-package com.baeldung.memoryleaks.staticfields;
-
-import java.util.ArrayList;
-import java.util.List;
-
-public class NonStaticFieldsDemo {
-    public List<Double> list = new ArrayList<>();
- 
-    public void populateList() {
-        for (int i = 0; i < 10000000; i++) {
-            list.add(Math.random());
-        }
-        System.out.println("Debug Point 2");
-    }
- 
-    public static void main(String[] args) {
-        System.out.println("Debug Point 1");
-        new NonStaticFieldsDemo().populateList();
-        System.out.println("Debug Point 3");
-    }
-}

core-java/src/main/java/com/baeldung/memoryleaks/staticfields/StaticFieldsDemo.java

@@ -1,21 +0,0 @@
-package com.baeldung.memoryleaks.staticfields;
-
-import java.util.ArrayList;
-import java.util.List;
-
-public class StaticFieldsDemo {
-    public static List<Double> list = new ArrayList<>();
- 
-    public void populateList() {
-        for (int i = 0; i < 10000000; i++) {
-            list.add(Math.random());
-        }
-        System.out.println("Debug Point 2");
-    }
- 
-    public static void main(String[] args) {
-        System.out.println("Debug Point 1");
-        new StaticFieldsDemo().populateList();
-        System.out.println("Debug Point 3");
-    }
-}

core-java/src/main/java/com/baeldung/outofmemoryerror/OutOfMemoryGCLimitExceed.java

@@ -1,19 +0,0 @@
-package com.baeldung.outofmemoryerror;
-
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Random;
-
-public class OutOfMemoryGCLimitExceed {
-    public static void addRandomDataToMap() {
-        Map<Integer, String> dataMap = new HashMap<>();
-        Random r = new Random();
-        while (true) {
-            dataMap.put(r.nextInt(), String.valueOf(r.nextInt()));
-        }
-    }
-
-    public static void main(String[] args) {
-        OutOfMemoryGCLimitExceed.addRandomDataToMap();
-    }
-}

core-java/src/main/java/com/baeldung/socket/EchoClient.java

@@ -1,47 +0,0 @@
-package com.baeldung.socket;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.io.*;
-import java.net.*;
-
-public class EchoClient {
-
-    private static final Logger LOG = LoggerFactory.getLogger(EchoClient.class);
-
-    private Socket clientSocket;
-    private PrintWriter out;
-    private BufferedReader in;
-
-    public void startConnection(String ip, int port) {
-        try {
-            clientSocket = new Socket(ip, port);
-            out = new PrintWriter(clientSocket.getOutputStream(), true);
-            in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
-        } catch (IOException e) {
-            LOG.debug("Error when initializing connection", e);
-        }
-
-    }
-
-    public String sendMessage(String msg) {
-        try {
-            out.println(msg);
-            return in.readLine();
-        } catch (Exception e) {
-            return null;
-        }
-    }
-
-    public void stopConnection() {
-        try {
-            in.close();
-            out.close();
-            clientSocket.close();
-        } catch (IOException e) {
-            LOG.debug("error when closing", e);
-        }
-
-    }
-}

core-java/src/main/java/com/baeldung/socket/EchoMultiServer.java

@@ -1,76 +0,0 @@
-package com.baeldung.socket;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.net.*;
-import java.io.*;
-
-public class EchoMultiServer {
-
-    private static final Logger LOG = LoggerFactory.getLogger(EchoMultiServer.class);
-
-    private ServerSocket serverSocket;
-
-    public void start(int port) {
-        try {
-            serverSocket = new ServerSocket(port);
-            while (true)
-                new EchoClientHandler(serverSocket.accept()).start();
-
-        } catch (IOException e) {
-            e.printStackTrace();
-        } finally {
-            stop();
-        }
-
-    }
-
-    public void stop() {
-        try {
-
-            serverSocket.close();
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-
-    }
-
-    private static class EchoClientHandler extends Thread {
-        private Socket clientSocket;
-        private PrintWriter out;
-        private BufferedReader in;
-
-        public EchoClientHandler(Socket socket) {
-            this.clientSocket = socket;
-        }
-
-        public void run() {
-            try {
-                out = new PrintWriter(clientSocket.getOutputStream(), true);
-                in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
-                String inputLine;
-                while ((inputLine = in.readLine()) != null) {
-                    if (".".equals(inputLine)) {
-                        out.println("bye");
-                        break;
-                    }
-                    out.println(inputLine);
-                }
-
-                in.close();
-                out.close();
-                clientSocket.close();
-
-            } catch (IOException e) {
-                LOG.debug(e.getMessage());
-            }
-        }
-    }
-
-    public static void main(String[] args) {
-        EchoMultiServer server = new EchoMultiServer();
-        server.start(5555);
-    }
-
-}

core-java/src/main/java/com/baeldung/socket/EchoServer.java

@@ -1,55 +0,0 @@
-package com.baeldung.socket;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.net.*;
-import java.io.*;
-
-public class EchoServer {
-
-    private static final Logger LOG = LoggerFactory.getLogger(EchoServer.class);
-
-    private ServerSocket serverSocket;
-    private Socket clientSocket;
-    private PrintWriter out;
-    private BufferedReader in;
-
-    public void start(int port) {
-        try {
-            serverSocket = new ServerSocket(port);
-            clientSocket = serverSocket.accept();
-            out = new PrintWriter(clientSocket.getOutputStream(), true);
-            in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
-            String inputLine;
-            while ((inputLine = in.readLine()) != null) {
-                if (".".equals(inputLine)) {
-                    out.println("good bye");
-                    break;
-                }
-                out.println(inputLine);
-            }
-        } catch (IOException e) {
-            LOG.debug(e.getMessage());
-        }
-
-    }
-
-    public void stop() {
-        try {
-            in.close();
-            out.close();
-            clientSocket.close();
-            serverSocket.close();
-        } catch (IOException e) {
-            LOG.debug(e.getMessage());
-        }
-
-    }
-
-    public static void main(String[] args) {
-        EchoServer server = new EchoServer();
-        server.start(4444);
-    }
-
-}

core-java/src/main/java/com/baeldung/socket/GreetClient.java

@@ -1,50 +0,0 @@
-package com.baeldung.socket;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.PrintWriter;
-import java.net.Socket;
-
-public class GreetClient {
-
-    private static final Logger LOG = LoggerFactory.getLogger(EchoMultiServer.class);
-
-    private Socket clientSocket;
-    private PrintWriter out;
-    private BufferedReader in;
-
-    public void startConnection(String ip, int port) {
-        try {
-            clientSocket = new Socket(ip, port);
-            out = new PrintWriter(clientSocket.getOutputStream(), true);
-            in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
-        } catch (IOException e) {
-            LOG.debug(e.getMessage());
-        }
-
-    }
-
-    public String sendMessage(String msg) {
-        try {
-            out.println(msg);
-            return in.readLine();
-        } catch (Exception e) {
-            return null;
-        }
-    }
-
-    public void stopConnection() {
-        try {
-            in.close();
-            out.close();
-            clientSocket.close();
-        } catch (IOException e) {
-            LOG.debug(e.getMessage());
-        }
-    }
-
-}

core-java/src/main/java/com/baeldung/socket/GreetServer.java

@@ -1,52 +0,0 @@
-package com.baeldung.socket;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.net.*;
-import java.io.*;
-
-public class GreetServer {
-
-    private static final Logger LOG = LoggerFactory.getLogger(GreetServer.class);
-
-    private ServerSocket serverSocket;
-    private Socket clientSocket;
-    private PrintWriter out;
-    private BufferedReader in;
-
-    public void start(int port) {
-        try {
-            serverSocket = new ServerSocket(port);
-            clientSocket = serverSocket.accept();
-            out = new PrintWriter(clientSocket.getOutputStream(), true);
-            in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
-            String greeting = in.readLine();
-            if ("hello server".equals(greeting))
-                out.println("hello client");
-            else
-                out.println("unrecognised greeting");
-        } catch (IOException e) {
-            LOG.debug(e.getMessage());
-        }
-
-    }
-
-    public void stop() {
-        try {
-            in.close();
-            out.close();
-            clientSocket.close();
-            serverSocket.close();
-        } catch (IOException e) {
-            LOG.debug(e.getMessage());
-        }
-
-    }
-
-    public static void main(String[] args) {
-        GreetServer server = new GreetServer();
-        server.start(6666);
-    }
-
-}