At the interview, me was asked question: "How to perform many calculations in single thread without freezes GUI component like Progress Bar or that would be able to check another user input? (Can execute only one thread)"
I Asked that can write event loop like Node.js.
But me say that Java already have some mechanism for it. That java can use hardware parallelization of operation. What the classes or special words can used for this task?
So, assuming we can't use either SwingWorker or Swing Timer, as they create a second thread to support their operations, the only choice you're left with is to use SwingUtilities#invokeLater to repeatedly call a method, which performs a small subset of the work and updates the UI before calling itself again (using SwingUtilities#invokeLater)
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class NoMoreThreads {
public static void main(String[] args) {
new NoMoreThreads();
}
public NoMoreThreads() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static class TestPane extends JPanel {
protected static final int MAX = 1000;
private JProgressBar pb;
private JButton start;
private int count;
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
start = new JButton("Let's get this party started");
start.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
start.setEnabled(false);
calculate();
}
});
pb = new JProgressBar(0, MAX);
add(start, gbc);
add(pb, gbc);
}
protected void calculate() {
count++;
if (count < MAX) {
pb.setValue(count);
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
calculate();
}
});
} else {
start.setEnabled(true);
}
}
}
}
Related
I want to update the Jlabel text in every second as long as the loop is running. how could I do this? I want to do as this fromat.
JPanel jpnl=new JPanel();
jfrm.add(jpnl);
String[] fonts=GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
jlab = new JLabel("This is Label");
jpnl.add(jlab);
for(int i=0;i<fonts.length;i++){
System.out.println(fonts[i]);
jlab.setText(fonts[i]);
jlab.setFont(new Font(fonts[i],Font.PLAIN,30));
jlab.setForeground(Color.DARK_GRAY);
}
Swing's single threaded nature precludes using a loop or Thread.sleep in the way you seem to be trying. Doing so, will simply block the UI and prevent it from been painted/updated until the loop is completed.
Because Swing is not thread safe, you can't simply use another Thread and the above approaches to update the UI, without jumping through some hoops
The conical answer to your question is to use a Swing Timer, which triggers an update at a regular bases. Because these updates are triggered within the context of the Event Dispatching Thread, it makes it safe to use when you want to update the UI.
Take a closer look at How to use Swing Timers for more details
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private String[] fonts;
private final JLabel jlab;
private int index = 0;
public TestPane() {
setLayout(new GridBagLayout());
fonts = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
jlab = new JLabel("This is Label");
add(jlab);
Timer timer = new Timer(1000, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
updateFont();
index++;
if (index >= fonts.length) {
((Timer)e.getSource()).stop();
}
}
});
timer.setInitialDelay(0);
timer.start();
}
protected void updateFont() {
System.out.println(fonts[index]);
jlab.setText(fonts[index]);
jlab.setFont(new Font(fonts[index], Font.PLAIN, 30));
jlab.setForeground(Color.DARK_GRAY);
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
}
I am making something and there will be a "Calculating" page on Java on an Applet! so what i want it to do is first drawstring and display "Calculating." then after a second it replaces that string and says "Calculating.." then again replace that string with "Calculating..." and loop that about 5 times. Is there any simple way of doing this??
I want it to display it on the applet!
You either want to use a Swing Timer or SwingWorker. See How to use Swing Timers and Worker Threads and SwingWorker for more details.
For example...
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static class TestPane extends JPanel {
private JLabel label;
private static final String DOTS = "...";
private static final String TEXT = "Calculating";
private int counter;
public TestPane() {
setLayout(new GridBagLayout());
label = new JLabel(getText());
add(label);
Timer timer = new Timer(1000, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
counter++;
if (counter > 3) {
counter = 0;
}
label.setText(getText());
}
});
timer.start();
}
protected String getText() {
String sufix = DOTS.substring(0, counter);
sufix = String.format("%-3s", sufix);
return TEXT + sufix;
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
}
Adding this to an applet is about as easy as adding to a JFrame
I have a question about JLabels. I am trying to program an application that has a window (Set up with JFrame.) with many JLabels. Anyway, I was wondering if there was a way I could have the window show, then modify the JLabels' text. The problem I am having is that the window won't show up until the program reaches the end of the class. Is there a way I can get around that? Do I have to use a Thread? If so, how would I do that.
Thanks,
~Rane
Example:
public class Start extends JFrame{
private static final long serialVersionUID = 1L;
Random random = new Random();
JPanel panel = new JPanel();
JLabel label = new JLabel("Label");
panel.add(label);
add(panel);
while(true){
int rnd = random.nextInt(4);
label.setText("" + rnd);
}
} // I want to do that, but the window won't show until the loop ends. In this case, the loop
// never will end. How would I do something like this if not the same exact thing?
Let's start with the fact that Swing is not thread safe and that all interactions and modifications to the UI should be made within the contentext of the Event Dispatching Thread.
This also means that you never perform any long running or time consuming actions within the context of the Event Dispatching Thread, as this will prevent it from processing new event placed on the EventQueue, including, repaint requests.
See Concurrency in Swing for more details.
The simplest solution would be to use a javax.swing.Timer. This will allow you to schedule a regular call back which is guaranteed to be triggered within the context of the EDT, making it safe to update the UI
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class RandomLabels {
public static void main(String[] args) {
new RandomLabels();
}
public RandomLabels() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JLabel label;
private Random rnd;
public TestPane() {
setLayout(new GridBagLayout());
label = new JLabel();
add(label);
rnd = new Random();
Timer timer = new Timer(40, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
label.setText(Integer.toString(rnd.nextInt()));
}
});
timer.start();
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
}
This also means you can control the Timer, starting it and stopping it when you want/need to with ease.
You could use a Thread, but the management requirements increase...You become responsible for managing the synchronisation of the updates to the UI, as well as having to implement functionality to actually stop the thread.
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.reflect.InvocationTargetException;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class RandomLabels {
public static void main(String[] args) {
new RandomLabels();
}
public RandomLabels() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JLabel label;
private Random rnd;
public TestPane() {
setLayout(new GridBagLayout());
label = new JLabel();
add(label);
rnd = new Random();
Thread t = new Thread(new Randomizer());
t.start();
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
public class Randomizer implements Runnable {
#Override
public void run() {
while (true) {
try {
EventQueue.invokeAndWait(new Runnable() {
#Override
public void run() {
label.setText(Integer.toString(rnd.nextInt()));
}
});
} catch (InterruptedException | InvocationTargetException exp) {
exp.printStackTrace();
}
try {
Thread.sleep(40);
} catch (InterruptedException ex) {
}
}
}
}
}
}
Another (better than using a Thread) solution might be to use a SwingWorker. Which would allow you to perform long running/blocking/time consuming actions within the background, but provides functionality to easily send updates back to the UI automatically.
Take a closer look at How to use Swing Timers and Worker Threads and SwingWorker for more details
And finally, take a look at Initial Threads. You must ensure that you UI is started/constructed within the context of the EDT as well...
Call setVisibile in the constructor before you enter the while loop.
public class Start extends JFrame {
private static final long serialVersionUID = 1L;
public Start() {
Random random = new Random();
JPanel panel = new JPanel();
JLabel label = new JLabel("Label");
panel.add(label);
add(panel);
this.setVisible(true); //IMPORTANT PART
while(true){
int rnd = random.nextInt(4);
label.setText("" + rnd);
}
}
}
I'm a super Java noob and need some help. I am trying to write a code that shows the word "on" on the JPanel for 5 (or however long I pass into y variable) seconds then changes the word to "off" on the same JPanel. Think of a stoplight that shows green for a period of time then goes to red. The code I have written below opens up two separate JFrames to display the different words. Any help or ideas would be greatly appreciated.
import javax.swing.*;
public class practice extends JFrame implements Runnable {
int x;
int y;
JLabel show = new JLabel("on");
JLabel show2 = new JLabel("off");
boolean yes;
public practice(boolean on, int x){
x=y;
yes = on;
setTitle("Stoplight");
setSize(500, 500);
setResizable(true);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void test(){
try {
Thread.sleep(y);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (yes == true){
add(show2);
}else if (yes == false)
add(show);
}
public void run() {
test();
}
public static void main (String[] args){
Thread t1 = new Thread(new practice(true, 50000));
Thread t2 = new Thread(new practice(false, 0));
t1.start();
t2.start();
}
}
You need remove the label 'on' of panel before add the label 'off' with the method remove(jcomponent)
As has already been hinted, you should use a javax.swing.Timer, which will allow you to schedule a callback after a specified period of time.
Unless you have a particular need, it's simpler to change the text of the label to have to remove the old label and add a new one (IMHO)
For example...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class DynamicLabel {
public static void main(String[] args) {
new DynamicLabel();
}
public DynamicLabel() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane(5000));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JLabel label;
public TestPane(int delay) {
setLayout(new GridBagLayout());
setBorder(new EmptyBorder(8, 8, 8, 8));
label = new JLabel("On");
add(label);
Timer timer = new Timer(delay, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
label.setText("Off");
}
});
timer.setRepeats(false);
timer.start();
}
}
}
How to edit the JLabel every seconds like (time left or score) in some games.
this is my code
static int l = 1;
static int s = 5000;
static int t = 90;
public static void main(String[] args) {
//Frame
final JFrame f = new JFrame();
f.setTitle("Picture Puzzle");
f.setSize(500,500);
f.setLocationRelativeTo(null);
f.setResizable(false);
f.setDefaultCloseOperation(EXIT_ON_CLOSE);
f.setVisible(true);
//some extra stuffs here
JLabel blevel00 = new JLabel("Level:" + l);
JLabel bscore00 = new JLabel("Score:" + s);
JLabel btime00 = new JLabel("Time:" + t);
p2.add(blevel00);
p2.add(bscore00);
p2.add(btime00);
//some extra stuffs here
start.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
while(t != 0 ) { //the t is the static int t = 90;
f.add(p2);
f.remove(p1);
f.setVisible(true);
f.revalidate();
f.repaint();
}
t--;
}
});
}
}
I tried this and nothing happens. any help will be appreciated.
Swing is a single threaded environment, that is, all alterations and modifications to the UI are expected to occur within the context of the Event Dispatching Thread.
Anything that blocks this thread, like a never ending loop or blocking I/O will prevent this thread from processing new events, including paint events.
Swing provides a number of solutions to this problem, in your case the best solution is probably to use a javax.swing.Timer. This will allow you to schedule a regular callback that is called within the context of the EDT, allowing you to make modifications to the UI on a regular bases.
Take a look at Concurrency in Swing and How to use Swing Timers for more details
Update with simple example
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DateFormat;
import java.util.Date;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class SimpleClock {
public static void main(String[] args) {
new SimpleClock();
}
public SimpleClock() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JLabel time;
public TestPane() {
setLayout(new GridBagLayout());
time = new JLabel();
time.setFont(time.getFont().deriveFont(Font.BOLD, 48));
add(time);
updateTime();
Timer timer = new Timer(500, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
updateTime();
}
});
timer.start();
}
protected void updateTime() {
time.setText(DateFormat.getTimeInstance().format(new Date()));
}
}
}