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JAVA-24699 | removing useless classes

This commit is contained in:
gaepi 2023-09-03 15:12:14 +02:00
parent 02a680c9d6
commit 7d712320ed
9 changed files with 0 additions and 719 deletions
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15
core-java-modules/Reminder Application/Reminder Application/task/src/reminderapplication/ConstraintsBuilder.java
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package reminderapplication;
import java.awt.GridBagConstraints;
import java.awt.Insets;
public class ConstraintsBuilder {
static GridBagConstraints constraint(int x, int y) {
final GridBagConstraints gridBagConstraints = new GridBagConstraints();
gridBagConstraints.gridx = x;
gridBagConstraints.gridy = y;
gridBagConstraints.insets = new Insets(5, 5, 5, 5);
return gridBagConstraints;
}
}

194
core-java-modules/Reminder Application/Reminder Application/task/src/reminderapplication/EditReminderFrame.java
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package reminderapplication;
import static reminderapplication.ConstraintsBuilder.*;
import java.awt.GridBagLayout;
import java.awt.HeadlessException;
import java.lang.reflect.InvocationTargetException;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
import javax.swing.DefaultComboBoxModel;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class EditReminderFrame extends JFrame {
private static Timer TIMER = new Timer();
private final TimeReminderApplication reminderApplication;
private final JLabel reminderTextLabel;
private final JLabel repeatPeriodLabel;
private final JLabel setDelayLabel;
private final JComboBox<Integer> delay;
private final JComboBox<Integer> period;
private final JButton cancelButton;
private final JButton okButton;
private final JTextField textField;
private final JLabel delaysLabel;
private final JLabel periodLabel;
private final int reminderIndex;
public EditReminderFrame(TimeReminderApplication reminderApp, String reminderText, int delayInSeconds, int periodInSeconds, int index) throws HeadlessException {
this.reminderApplication = reminderApp;
reminderIndex = index;
textField = createTextField(reminderText);
delay = createDelayComboBox(delayInSeconds);
period = createPeriodComboBox(periodInSeconds);
cancelButton = createCancelButton();
okButton = createOkButton();
reminderTextLabel = createReminderTextLabel();
repeatPeriodLabel = createRepeatPeriodLabel();
setDelayLabel = createSetDelayLabel();
delaysLabel = createDelaysLabel();
periodLabel = createPeriodLabel();
configureVisualRepresentation();
configureActions();
}
private void configureActions() {
updateReminder();
}
private void configureVisualRepresentation() {
configureFrame();
setLocationRelativeTo(null);
setLayout(new GridBagLayout());
add(reminderTextLabel, constraint(0,0));
add(repeatPeriodLabel, constraint(1,0));
add(setDelayLabel, constraint(2,0));
add(textField, constraint(0, 1));
add(delay, constraint(1, 1));
add(period, constraint(2, 1));
add(delaysLabel, constraint(1,3));
add(periodLabel, constraint(2,3));
add(okButton, constraint(1, 4));
add(cancelButton, constraint(2, 4));
pack();
setVisible(true);
}
private void configureFrame() {
setTitle("Set Reminder");
setName("Set Reminder");
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
private static JLabel createSetDelayLabel() {
return createLabel("Set Delay", "Set Delay Label");
}
private static JLabel createRepeatPeriodLabel() {
return createLabel("Set Period", "Set Repeat Period Label");
}
private static JLabel createReminderTextLabel() {
return createLabel("Reminder Text", "Reminder Text Label");
}
private JLabel createPeriodLabel() {
return createLabel("0", "Period label");
}
private JLabel createDelaysLabel() {
return createLabel("30", "Delays Label");
}
private JComboBox<Integer> createPeriodComboBox(final int periodInSeconds) {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{0, 5, 10, 20}));
comboBox.setSelectedItem(periodInSeconds);
comboBox.setName("set Period");
comboBox.addActionListener(e -> periodLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JComboBox<Integer> createDelayComboBox(final int delayInSeconds) {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{30, 25, 15, 5}));
comboBox.setSelectedItem(delayInSeconds);
comboBox.setName("set Delay");
comboBox.addActionListener(e -> delaysLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JTextField createTextField(final String reminderText) {
final JTextField textField = new JTextField(20);
textField.setName("Field");
textField.setText(reminderText);
return textField;
}
private JButton createOkButton() {
final JButton button = new JButton("ok");
button.setName("OK");
return button;
}
private void updateReminder() {
okButton.addActionListener(e -> this.dispose());
okButton.addActionListener(e -> {
final int periodInSeconds = getTimeInSeconds(period);
final int delayInSeconds = getTimeInSeconds(delay);
final Reminder reminder = new Reminder(textField.getText(), delayInSeconds, periodInSeconds);
((DefaultListModel<Reminder>) reminderApplication.getReminders()).set(reminderIndex, reminder);
});
okButton.addActionListener(e -> scheduleReminder(textField, delay, period));
}
private void scheduleReminder(final JTextField textField, final JComboBox<Integer> delay, final JComboBox<Integer> period) {
final int periodInSeconds = getTimeInSeconds(period);
if (periodInSeconds == 0)
scheduleNonRepeatedReminder(textField, delay);
else
scheduleRepeatedReminder(textField, delay, period);
}
private void scheduleRepeatedReminder(final JTextField textField, final JComboBox<Integer> delay, final JComboBox<Integer> period) {
final int delayInSeconds = getTimeInSeconds(delay);
final int periodInSeconds = getTimeInSeconds(period);
final TimerTask timerTask = getTimerTask(textField.getText(), delayInSeconds, periodInSeconds);
TIMER.schedule(timerTask, TimeUnit.SECONDS.toMillis(delayInSeconds), TimeUnit.SECONDS.toMillis(periodInSeconds));
}
private void scheduleNonRepeatedReminder(final JTextField textField, final JComboBox<Integer> delay) {
final int delayInSeconds = getTimeInSeconds(delay);
final int periodInSeconds = 0;
final TimerTask timerTask = getTimerTask(textField.getText(), delayInSeconds, periodInSeconds);
TIMER.schedule(timerTask, TimeUnit.SECONDS.toMillis(delayInSeconds));
}
private int getTimeInSeconds(final JComboBox<Integer> comboBox) {
if (comboBox != null && comboBox.getSelectedItem() != null)
return ((Integer) comboBox.getSelectedItem());
else
return 0;
}
private TimerTask getTimerTask(final String reminderText, final Integer delayInSeconds, final Integer periodInSeconds) {
return new TimerTask() {
@Override
public void run() {
new ReminderPopupFrame(reminderApplication, reminderText, delayInSeconds, periodInSeconds);
}
};
}
private JButton createCancelButton() {
final JButton button = new JButton("cancel");
button.setName("Cancel");
button.addActionListener(e -> this.dispose());
return button;
}
private static JLabel createLabel(final String text, final String name) {
JLabel label = new JLabel(text);
label.setName(name);
return label;
}
}

33
core-java-modules/Reminder Application/Reminder Application/task/src/reminderapplication/Reminder.java
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package reminderapplication;
public class Reminder {
private static String REMINDER_FORMAT = "Reminder Text: %s; Delay: %d; Period: %d;";
private final String name;
private final int delay;
private final int period;
public Reminder(final String name, final int delay, final int period) {
this.name = name;
this.delay = delay;
this.period = period;
}
public String getName() {
return name;
}
public int getDelay() {
return delay;
}
public int getPeriod() {
return period;
}
@Override
public String toString() {
return REMINDER_FORMAT.formatted(name, delay, period);
}
}

186
core-java-modules/Reminder Application/Reminder Application/task/src/reminderapplication/ReminderFrame.java
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package reminderapplication;
import static reminderapplication.ConstraintsBuilder.*;
import java.awt.GridBagLayout;
import java.awt.HeadlessException;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
import javax.swing.DefaultComboBoxModel;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class ReminderFrame extends JFrame {
private static Timer TIMER = new Timer();
private final TimeReminderApplication reminderApplication;
private final JLabel reminderTextLabel;
private final JLabel repeatPeriodLabel;
private final JLabel setDelayLabel;
private final JComboBox<Integer> delay;
private final JComboBox<Integer> period;
private final JButton cancelButton;
private final JButton okButton;
private final JTextField textField;
private final JLabel delaysLabel;
private final JLabel periodLabel;
public ReminderFrame(TimeReminderApplication reminderApp) throws HeadlessException {
this.reminderApplication = reminderApp;
textField = createTextField();
delay = createDelayComboBox();
period = createPeriodComboBox();
cancelButton = createCancelButton();
okButton = createOkButton();
reminderTextLabel = createReminderTextLabel();
repeatPeriodLabel = createRepeatPeriodLabel();
setDelayLabel = createSetDelayLabel();
delaysLabel = createDelaysLabel();
periodLabel = createPeriodLabel();
configureVisualRepresentation();
configureActions();
}
private void configureActions() {
createNewReminder();
}
private void configureVisualRepresentation() {
configureFrame();
setLocationRelativeTo(null);
setLayout(new GridBagLayout());
add(reminderTextLabel, constraint(0,0));
add(repeatPeriodLabel, constraint(1,0));
add(setDelayLabel, constraint(2,0));
add(textField, constraint(0, 1));
add(delay, constraint(1, 1));
add(period, constraint(2, 1));
add(delaysLabel, constraint(1,3));
add(periodLabel, constraint(2,3));
add(okButton, constraint(1, 4));
add(cancelButton, constraint(2, 4));
pack();
setVisible(true);
}
private void configureFrame() {
setTitle("Set Reminder");
setName("Set Reminder");
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
private static JLabel createSetDelayLabel() {
return createLabel("Set Delay", "Set Delay Label");
}
private static JLabel createRepeatPeriodLabel() {
return createLabel("Set Period", "Set Repeat Period Label");
}
private static JLabel createReminderTextLabel() {
return createLabel("Reminder Text", "Reminder Text Label");
}
private JLabel createPeriodLabel() {
return createLabel("0", "Period label");
}
private JLabel createDelaysLabel() {
return createLabel("30", "Delays Label");
}
private JComboBox<Integer> createPeriodComboBox() {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{0, 5, 10, 20}));
comboBox.setName("set Period");
comboBox.addActionListener(e -> periodLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JComboBox<Integer> createDelayComboBox() {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{30, 25, 15, 5}));
comboBox.setName("set Delay");
comboBox.addActionListener(e -> delaysLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JTextField createTextField() {
final JTextField textField = new JTextField(20);
textField.setName("Field");
return textField;
}
private JButton createOkButton() {
final JButton button = new JButton("ok");
button.setName("OK");
return button;
}
private void createNewReminder() {
okButton.addActionListener(e -> this.dispose());
okButton.addActionListener(e -> {
final int periodInSeconds = getTimeInSeconds(period);
final int delayInSeconds = getTimeInSeconds(delay);
final Reminder reminder = new Reminder(textField.getText(), delayInSeconds, periodInSeconds);
((DefaultListModel<Reminder>) reminderApplication.getReminders()).addElement(reminder);
});
okButton.addActionListener(e -> scheduleReminder(textField, delay, period));
}
private void scheduleReminder(final JTextField textField, final JComboBox<Integer> delay, final JComboBox<Integer> period) {
final int periodInSeconds = getTimeInSeconds(period);
if (periodInSeconds == 0)
scheduleNonRepeatedReminder(textField, delay);
else
scheduleRepeatedReminder(textField, delay, period);
}
private void scheduleRepeatedReminder(final JTextField textField, final JComboBox<Integer> delay, final JComboBox<Integer> period) {
final int delayInSeconds = getTimeInSeconds(delay) + 200;
final int periodInSeconds = getTimeInSeconds(period);
final TimerTask timerTask = getTimerTask(textField.getText(), delayInSeconds, periodInSeconds);
TIMER.schedule(timerTask, TimeUnit.SECONDS.toMillis(delayInSeconds), TimeUnit.SECONDS.toMillis(periodInSeconds));
}
private void scheduleNonRepeatedReminder(final JTextField textField, final JComboBox<Integer> delay) {
final int delayInSeconds = getTimeInSeconds(delay);
final int periodInSeconds = 0;
final TimerTask timerTask = getTimerTask(textField.getText(), delayInSeconds, periodInSeconds);
TIMER.schedule(timerTask, TimeUnit.SECONDS.toMillis(delayInSeconds));
}
private int getTimeInSeconds(final JComboBox<Integer> comboBox) {
if (comboBox != null && comboBox.getSelectedItem() != null)
return ((Integer) comboBox.getSelectedItem());
else
return 0;
}
private TimerTask getTimerTask(final String reminderText, final Integer delayInSeconds, final Integer periodInSeconds) {
return new TimerTask() {
@Override
public void run() {
new ReminderPopupFrame(reminderApplication, reminderText, delayInSeconds, periodInSeconds);
}
};
}
private JButton createCancelButton() {
final JButton button = new JButton("cancel");
button.setName("Cancel");
button.addActionListener(e -> this.dispose());
return button;
}
private static JLabel createLabel(final String text, final String name) {
JLabel label = new JLabel(text);
label.setName(name);
return label;
}
}

151
core-java-modules/Reminder Application/Reminder Application/task/src/reminderapplication/ReminderPopupFrame.java
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package reminderapplication;
import static reminderapplication.ConstraintsBuilder.*;
import java.awt.GridBagLayout;
import java.awt.HeadlessException;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
import javax.swing.DefaultComboBoxModel;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class ReminderPopupFrame extends JFrame {
private static final Timer TIMER = new Timer();
private final int AUTOMATIC_CLOSE_TIME_IN_SECONDS = 10;
private final TimeReminderApplication reminderApplication;
private final JLabel reminderTextLabel;
private final JLabel repeatPeriodLabel;
private final JLabel setDelayLabel;
private final JComboBox<Integer> delay;
private final JComboBox<Integer> period;
private final JButton cancelButton;
private final JButton okButton;
private final JTextField textField;
private final JLabel delaysLabel;
private final JLabel periodLabel;
public ReminderPopupFrame(TimeReminderApplication reminderApp, final String text, final Integer delayInSeconds, final Integer periodInSeconds) throws HeadlessException {
this.reminderApplication = reminderApp;
textField = createTextField(text);
delay = createDelayComboBox(delayInSeconds);
period = createPeriodComboBox(periodInSeconds);
cancelButton = createCancelButton();
okButton = createDisabledOkButton();
reminderTextLabel = createReminderTextLabel();
repeatPeriodLabel = createRepeatPeriodLabel();
setDelayLabel = createSetDelayLabel();
delaysLabel = createDelaysLabel();
periodLabel = createPeriodLabel();
configureVisualRepresentation();
configureActions();
}
private void configureActions() {
scheduleClosing();
}
private void scheduleClosing() {
final TimerTask timerTask = new TimerTask() {
@Override
public void run() {
ReminderPopupFrame.this.dispose();
}
};
TIMER.schedule(timerTask, TimeUnit.SECONDS.toMillis(AUTOMATIC_CLOSE_TIME_IN_SECONDS));
}
private void configureVisualRepresentation() {
configureFrame();
setLocationRelativeTo(null);
setLayout(new GridBagLayout());
add(reminderTextLabel, constraint(0,0));
add(repeatPeriodLabel, constraint(1,0));
add(setDelayLabel, constraint(2,0));
add(textField, constraint(0, 1));
add(delay, constraint(1, 1));
add(period, constraint(2, 1));
add(delaysLabel, constraint(1,3));
add(periodLabel, constraint(2,3));
add(okButton, constraint(1, 4));
add(cancelButton, constraint(2, 4));
pack();
setVisible(true);
}
private void configureFrame() {
setTitle("Set Reminder");
setName("Set Reminder");
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
private static JLabel createSetDelayLabel() {
return createLabel("Set Delay", "Set Delay Label");
}
private static JLabel createRepeatPeriodLabel() {
return createLabel("Set Period", "Set Repeat Period Label");
}
private static JLabel createReminderTextLabel() {
return createLabel("Reminder Text", "Reminder Text Label");
}
private JLabel createPeriodLabel() {
return createLabel("0", "Period label");
}
private JLabel createDelaysLabel() {
return createLabel("30", "Delays Label");
}
private JComboBox<Integer> createPeriodComboBox(final Integer periodInSeconds) {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{0, 5, 10, 20}));
comboBox.setName("set Period");
comboBox.setSelectedItem(periodInSeconds);
comboBox.addActionListener(e -> periodLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JComboBox<Integer> createDelayComboBox(Integer delay) {
final JComboBox<Integer> comboBox = new JComboBox<>(new DefaultComboBoxModel<>(new Integer[]{30, 25, 15, 5}));
comboBox.setSelectedItem(delay);
comboBox.setName("set Delay");
comboBox.addActionListener(e -> delaysLabel.setText(comboBox.getSelectedItem().toString()));
return comboBox;
}
private JTextField createTextField(final String text) {
final JTextField textField = new JTextField(20);
textField.setName("Field");
textField.setText(text);
return textField;
}
private JButton createDisabledOkButton() {
final JButton button = new JButton("ok");
button.setName("OK");
button.setEnabled(false);
return button;
}
private JButton createCancelButton() {
final JButton button = new JButton("cancel");
button.setName("Cancel");
button.addActionListener(e -> this.dispose());
return button;
}
private static JLabel createLabel(final String text, final String name) {
JLabel label = new JLabel(text);
label.setName(name);
return label;
}
}

1
guest/README.md
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## Relevant articles:

30
guest/memory-leaks/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>memory-leaks</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>memory-leaks</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<build>
<resources>
<resource>
<directory>src/main/resources/</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
<resource>
<directory>src/test/resources/</directory>
</resource>
</resources>
</build>
</project>

11
guest/memory-leaks/src/test/java/com/baeldung/Key.java
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package com.baeldung;
public class Key {
public static String key;
public Key(String key) {
Key.key = key;
}
}

98
guest/memory-leaks/src/test/java/com/baeldung/MemoryLeaksTest.java
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//package com.baeldung;
//
//import java.io.BufferedReader;
//import java.io.File;
//import java.io.IOException;
//import java.io.InputStream;
//import java.io.InputStreamReader;
//import java.net.URISyntaxException;
//import java.net.URL;
//import java.net.URLConnection;
//import java.nio.charset.StandardCharsets;
//import java.nio.file.Files;
//import java.nio.file.Paths;
//import java.nio.file.StandardOpenOption;
//import java.util.ArrayList;
//import java.util.Map;
//import java.util.Random;
//import java.util.Scanner;
//
//import org.junit.FixMethodOrder;
//import org.junit.Test;
//import org.junit.runner.RunWith;
//import org.junit.runners.JUnit4;
//import org.junit.runners.MethodSorters;
//
//@FixMethodOrder(MethodSorters.NAME_ASCENDING)
//@RunWith(JUnit4.class)
//public class MemoryLeaksTest {
// private Random random = new Random();
// public static final ArrayList<Double> list = new ArrayList<Double>(1000000);
//
// @Test
// public void givenStaticField_whenLotsOfOperations_thenMemoryLeak() throws InterruptedException {
// for (int i = 0; i < 1000000; i++) {
// list.add(random.nextDouble());
// }
// System.gc();
// Thread.sleep(10000); //to allow GC do its job
// }
//
//
// @Test
// public void givenNormalField_whenLotsOfOperations_thenGCWorksFine() throws InterruptedException {
// addElementsToTheList();
// System.gc();
// Thread.sleep(10000); //to allow GC do its job
// }
//
// private void addElementsToTheList(){
// ArrayList<Double> list = new ArrayList<Double>(1000000);
// for (int i = 0; i < 1000000; i++) {
// list.add(random.nextDouble());
// }
// }
//
// @SuppressWarnings({ "resource" })
// @Test(expected = OutOfMemoryError.class)
// public void givenLengthString_whenIntern_thenOutOfMemory() throws IOException, InterruptedException {
// Thread.sleep(15000);
// String str = new Scanner(new File("src/test/resources/large.txt"), "UTF-8").useDelimiter("\\A")
// .next();
// System.gc();
// str.intern();
// Thread.sleep(10000);
// }
//
// @Test(expected = OutOfMemoryError.class)
// public void givenURL_whenUnclosedStream_thenOutOfMemory() throws IOException, URISyntaxException {
// String str = "";
// URLConnection conn = new URL("http:norvig.com/big.txt").openConnection();
// BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));
// while (br.readLine() != null) {
// str += br.readLine();
// }
// Files.write(Paths.get("src/main/resources/"), str.getBytes(), StandardOpenOption.CREATE);
// }
//
// @SuppressWarnings("unused")
// @Test(expected = OutOfMemoryError.class)
// public void givenConnection_whenUnclosed_thenOutOfMemory() throws IOException, URISyntaxException {
// URL url = new URL("ftp:speedtest.tele2.net");
// URLConnection urlc = url.openConnection();
// InputStream is = urlc.getInputStream();
// String str = "";
// while (true) {
// str += is.toString()
// .intern();
// }
// }
//
// @Test(expected = OutOfMemoryError.class)
// public void givenMap_whenNoEqualsNoHashCodeMethods_thenOutOfMemory() throws IOException, URISyntaxException {
// Map<Object, Object> map = System.getProperties();
// while (true) {
// map.put(new Key("key"), "value");
// }
// }
//}