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What else can be optimized how to use JTextField default text prompt function

What else can be optimized how to use JTextField default text prompt function
Thank you all for your answers
=============================================================================
import java.awt.FlowLayout;
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;[enter image description here][1]
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
class WindowActionEvent extends JFrame {
JTextField text;
JTextArea textShow;
JButton button;
ReaderListen listener;
public WindowActionEvent() throws HeadlessException {
init();
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
void init() {
setLayout(new FlowLayout());
text = new JTextField(10);
button = new JButton("读取");
textShow = new JTextArea(25,50);
textShow.setEditable(false);
listener = new ReaderListen();
listener.setJTextField(text);
listener.setJTextArea(textShow);
text.addActionListener(listener);
button.addActionListener(listener);
add(text);
add(button);
add(new JScrollPane(textShow));
}
}
class ReaderListen implements ActionListener {
JTextField text;
JTextArea textShow;
public void setJTextField(JTextField text) {
this.text = text;
}
public void setJTextArea(JTextArea textShow) {
this.textShow = textShow;
}
#Override
public void actionPerformed(ActionEvent e) {
try {
File file = new File(text.getText()); //getDocument()
FileReader inOne = new FileReader(file);
BufferedReader inTwo = new BufferedReader(inOne);
String s = null;
while ((s = inTwo.readLine()) != null) {
textShow.append(s+"\n");
}
inOne.close();
inTwo.close();
} catch (Throwable e2) {
e2.printStackTrace();
}
}
}
public class Matematiktest extends WindowActionEvent {
public static void main(String[] args) {
WindowActionEvent win = new WindowActionEvent();
win.setBounds(100,100,1000,500);
win.setTitle("处理ActionEvent事件");
}
}
This is the code I checked about the default text prompt function of JTextField but I don’t know where it should be placed or used
import java.awt.Color;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import javax.swing.JTextField;
public class JTextFieldHintListener implements FocusListener {
private String hintText;
private JTextField textField;
public JTextFieldHintListener(JTextField jTextField,String hintText) {
this.textField = jTextField;
this.hintText = hintText;
jTextField.setText(hintText); //默认直接显示
jTextField.setForeground(Color.GRAY);
}
#Override
public void focusGained(FocusEvent e) {
//获取焦点时，清空提示内容
String temp = textField.getText();
if(temp.equals(hintText)) {
textField.setText("");
textField.setForeground(Color.BLACK);
}
}
#Override
public void focusLost(FocusEvent e) {
//失去焦点时，没有输入内容，显示提示内容
String temp = textField.getText();
if(temp.equals("")) {
textField.setForeground(Color.GRAY);
textField.setText(hintText);
}
}
}

java AWT FileDialog modify the files of type list

I've been searching a lot for this issue, but couldn't find a solution for it. I'm using a FileDialog in my java program and I want to change the 'File Type' list, or the file extensions accepted..
img
I know this is doable with a JFileChooser, but I don't like how swing components look (buttons, menus and so on..)
So, is there a way to do this with the FileDialog?
edit:
import java.awt.Button;
import java.awt.Canvas;
import java.awt.FileDialog;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.filechooser.FileNameExtensionFilter;
public class Start {
private static final String MODEL_EXTENSION = ".modl";
private static final int w = 650, h = 600;
public static JFrame frame;
public static MenuBar jmb;
public static Canvas canvas;
public static void main(String[] args) {
frame = new JFrame("Model Editor");
frame.setSize(w,h);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
jmb = new MenuBar();
frame.setMenuBar(jmb);
Button b = new Button();
frame.add(b);
initFileMenu();
initEditMenu();
}
private static void initFileMenu() {
Menu file = new Menu("File");
jmb.add(file);
MenuItem file_new = new MenuItem("New");
file.add(file_new);
MenuItem file_open = new MenuItem("Open File...");
file.add(file_open);
file_open.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent arg0) {
FileDialog fd = new FileDialog(frame);
fd.setFile("*" + MODEL_EXTENSION);
fd.setFilenameFilter(new ExtensionFilter(new FileNameExtensionFilter(MODEL_EXTENSION, "Model in MODL format")));
fd.setVisible(true);
}
});
file.addSeparator();
MenuItem file_close = new MenuItem("Close");
file.add(file_close);
file_close.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent arg0) {
frame.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));
}
});
}
private static void initEditMenu() {
Menu edit = new Menu("Edit");
jmb.add(edit);
MenuItem undo = new MenuItem("Undo");
edit.add(undo);
MenuItem redo = new MenuItem("Redo");
edit.add(redo);
edit.addSeparator();
}
}
import java.io.File;
import java.io.FilenameFilter;
import javax.swing.filechooser.FileNameExtensionFilter;
public final class ExtensionFilter implements FilenameFilter {
private final FileNameExtensionFilter extFilter;
public ExtensionFilter() {
this(new FileNameExtensionFilter("MODL file", "modl"));
}
public ExtensionFilter(FileNameExtensionFilter extFilter) {
this.extFilter = extFilter;
}
#Override
public boolean accept(File dir, String name) {
return extFilter.accept(new File(dir, name));
}
}

Java task not updating jlabel

Question I have is I am trying to update my gui with a timer(this works and changes the image for mypic but, it will not update mytext label for some weird reason any help would be very much appreciated!
*I should add that mytext isn't showing up at all on my gui since introducing the timer...but mypic does????
package widget;
import com.sun.awt.AWTUtilities;
import com.sun.xml.internal.ws.client.sei.ResponseBuilder;
import javafx.geometry.HorizontalDirection;
import javafx.scene.shape.Ellipse;
import javax.swing.*;
import javax.swing.Timer;
import javax.xml.parsers.ParserConfigurationException;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Ellipse2D;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.*;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.xml.sax.SAXException;
import widget.weather;
import static java.awt.Color.*;
/**
* Created by xxxxxxzz on 10/19/2016.
*/
public class Widget extends JFrame {
String icon_image = null;
String temp = null;
JLabel myText = null;
JLabel mypic = null;
Timer SimpleTimer = new Timer(5000, new ActionListener(){
#Override
public void actionPerformed(ActionEvent e) {
try {
icon_image = weather.weather_pic();
temp = weather.temp();
URL url = new URL(icon_image);
ImageIcon img = new ImageIcon(url);
myText = new JLabel(temp);
//Tried setting it like this and still doesn't work
// myText = new JLabel("HOT");
mypic = new JLabel();
myText.setText(temp);
mypic.setIcon(img);
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
public Widget() throws IOException, URISyntaxException {
setUndecorated(true);
setSize(150,150);
temp = weather.temp();
icon_image = weather.weather_pic();
URL url = new URL(icon_image);
ImageIcon img = new ImageIcon(url);
myText = new JLabel(temp);
mypic = new JLabel();
myText.setText(temp);
mypic.setIcon(img);
myText.setHorizontalAlignment(JLabel.CENTER);
mypic.setHorizontalAlignment(JLabel.CENTER);
add(myText);
add(mypic);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setVisible(true);
Shape shape = new Ellipse2D.Float(0,0,150,150);
AWTUtilities.setWindowShape(this, shape);
SimpleTimer.start();
}
public static void main(String[] args) throws IOException, SAXException, ParserConfigurationException, URISyntaxException {
new Widget();
}
}
UPDATE with suggestions still isn't working..
package widget;
import com.sun.awt.AWTUtilities;
import com.sun.xml.internal.ws.client.sei.ResponseBuilder;
import javafx.geometry.HorizontalDirection;
import javafx.scene.shape.Ellipse;
import javax.swing.*;
import javax.swing.Timer;
import javax.xml.parsers.ParserConfigurationException;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Ellipse2D;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.*;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.xml.sax.SAXException;
import widget.weather;
import static java.awt.Color.*;
/**
* Created by jsnow on 10/19/2016.
*/
public class Widget extends JFrame {
String icon_image = null;
String temp = null;
JLabel myText = new JLabel();
JLabel mypic = new JLabel();
Timer SimpleTimer = new Timer(5000, new ActionListener(){
#Override
public void actionPerformed(ActionEvent e) {
try {
icon_image = weather.weather_pic();
temp = weather.temp();
URL url = new URL(icon_image);
ImageIcon img = new ImageIcon(url);
myText.setText(temp);
mypic.setIcon(img);
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
public Widget() throws IOException, URISyntaxException {
setUndecorated(true);
setSize(150,150);
temp = weather.temp();
icon_image = weather.weather_pic();
URL url = new URL(icon_image);
ImageIcon img = new ImageIcon(url);
myText.setText(temp);
mypic.setIcon(img);
myText.setHorizontalAlignment(JLabel.CENTER);
mypic.setHorizontalAlignment(JLabel.CENTER);
add(myText);
add(mypic);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setVisible(true);
Shape shape = new Ellipse2D.Float(0,0,150,150);
AWTUtilities.setWindowShape(this, shape);
SimpleTimer.start();
}
public static void main(String[] args) throws IOException, SAXException, ParserConfigurationException, URISyntaxException {
new Widget();
}
}

Here's a working solution which you can tailor to your use. The cause seemed to be the way you had tried to display the Components rather than the code in your action listener.
Your approach was just replacing myText with myPic when you initially set up the JFrame. Instead you need to use a layout manager. The example I've given is with overlaying using JLayeredPane. You may wish to use a layout manager instead if this is not the desired outcome, see the Oracle Tutorial on using layout managers.
Widget class
package widget;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Ellipse2D;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class Widget extends JFrame {
private static final int UPDATE_TICK = 5_000;
private static final int WIDGET_WIDTH = 150;
private static final int WIDGET_HEIGHT = 150;
private JLabel myText = new JLabel();
private JLabel myPic = new JLabel();
private Weather weather = new Weather();
private Timer simpleTimer;
public void createAndShow() {
setUndecorated(true);
setSize(WIDGET_WIDTH, WIDGET_HEIGHT);
Shape shape = new Ellipse2D.Float(0, 0, WIDGET_WIDTH, WIDGET_HEIGHT);
// AWTUtilities.setWindowShape(this, shape);
setShape(shape); // do this instead
myText.setHorizontalAlignment(JLabel.CENTER);
myPic.setHorizontalAlignment(JLabel.CENTER);
JLayeredPane layered = new JLayeredPane();
myText.setBounds(0, 0, WIDGET_WIDTH, WIDGET_HEIGHT);
myPic.setBounds(0, 0, WIDGET_WIDTH, WIDGET_HEIGHT);
layered.add(myPic, 1, 0);
layered.add(myText, 2, 0);
add(layered);
simpleTimer = new Timer(UPDATE_TICK, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
update();
}
});
update();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
simpleTimer.start();
}
private void update() {
myText.setText(weather.getTemp());
myPic.setIcon(new ImageIcon(weather.getImage(WIDGET_WIDTH, WIDGET_HEIGHT)));
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
Widget w = new Widget();
w.createAndShow();;
}
});
}
}
Weather class for demonstration purposes
package widget;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.util.Random;
public class Weather {
private static final Random rand = new Random();
private static final Color[] randColors = {Color.YELLOW,
Color.GREEN,
Color.WHITE};
public String getTemp() {
return Integer.toString(rand.nextInt(100));
}
public BufferedImage getImage(int width, int height) {
int colorIndex = rand.nextInt(randColors.length);
BufferedImage img = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < img.getWidth(); x++) {
for (int y = 0; y < img.getHeight(); y++) {
img.setRGB(x, y, randColors[colorIndex].getRGB());
}
}
return img;
}
}

Outofmemory exception loading image files in Java

i have a problem loading image files.
There are 2 cases, i've tested. The problem occures only in the first one. In both cases a JDialog-window apears that displays a
downscaled image. After 300ms this window closes automatically (there is a timer in the constructor of ImageDialog and CardPrinter; this is only for debugging).
In the production version, the programm must be able to load 30-40 images (one by one) in a JDialog. The user types some text, and clicks on a button to show the next image.
To load the images i use ImageIO.read() in both cases. Alternatively i used CMYKJPEGImage (http://www.randelshofer.ch/blog/2011/08/reading-cmyk-jpeg-images-with-java-imageio/)
but it also produces the exception.
In Main there is myTimer that continusly opens the JDialog with an image-file (listFilesRecurse() should be called with an absolute path by setting the variable pathtofiles).
Case 1)
Loading images in JDialog with overlay layout manager (Main.java, CardPrinter.java, IDCardLayout.java).
For this, the lines from 'CardPrinter cp=null;' to 'cp.dispose();' in Main.java must be uncommented. The tricky part is in addIDCard()#CardPrinter.
Here will be the layout built up. After this paintComponent()#IDCardLayout will be called, if the content of the dialog-window should be actualised.
It seems, that the loaded images won't be destroyed, and the memory gets full (in Window's Taskmanager the memory usage can be seen).
Case 2)
Loading images in a JDialog with no layout manager (Main.java, ImageDialog.java).
(Uncomment the line 'mn.showDialog(mn.frame, file);').
Works perfect. No exceptions!
The function ImageIO.read() should be ok, because in the 2. case, there was no errors (even if the code runs for 20 minutes).
It's strange, it seems in the first case the layoutmanager prevents GC to unload the unused images...
The problem in the 1.case should be in CTR#CardPrinter and addIDCard()#CardPrinter. In CTR i use the OverlayLayout. In the 2.case, there is no Layoutmanager at all.
The Java version is: 1.7.0_80 on Windows7 SP1.
Can somebody help me please?
Thank you in advance,
Daniel
The exception:
Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferByte.(DataBufferByte.java:92)
at java.awt.image.ComponentSampleModel.createDataBuffer(ComponentSampleModel.java:415)
at java.awt.image.Raster.createWritableRaster(Raster.java:941)
at javax.imageio.ImageTypeSpecifier.createBufferedImage(ImageTypeSpecifier.java:1073)
at javax.imageio.ImageReader.getDestination(ImageReader.java:2896)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:1066)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:1034)
at javax.imageio.ImageIO.read(ImageIO.java:1448)
at javax.imageio.ImageIO.read(ImageIO.java:1308)
at test.IDCardLayout.loadPicture(IDCardLayout.java:128)
at test.CardPrinter.addIDCard(CardPrinter.java:142)
at test.CardPrinter.(CardPrinter.java:62)
at test.CardPrinter.createDialog(CardPrinter.java:91)
at test.Main$1.actionPerformed(Main.java:69)
at javax.swing.Timer.fireActionPerformed(Timer.java:312)
at javax.swing.Timer$DoPostEvent.run(Timer.java:244)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:745)
at java.awt.EventQueue.access$300(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:706)
at java.awt.EventQueue$3.run(EventQueue.java:704)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:715)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
package test;
/*Main.java*/
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import java.util.Vector;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
public class Main {
JFrame frame;
//list files recursively, using a filter (pattern). If pattern=*, all files will be listed.
public static void listFilesRecurse(String fullpath, String pattern[], Vector<File> foundFiles) throws IOException {
File dir = new File(fullpath);
File list[] = dir.listFiles();
for(File f: list) {
if( !f.isDirectory() ) {
for(String pt: pattern) {
if(pt.equals("*")) {
foundFiles.add(f);
break;
}
else if( f.getAbsolutePath().toUpperCase().endsWith(pt.toUpperCase()) ) {
foundFiles.add(f);
break;
}
}
} else {
listFilesRecurse(f.getAbsolutePath(), pattern, foundFiles);
}
}
}
public static void main(String[] args) {
final Main mn = new Main();
final String pathtofiles = "\\path\\to\\files\\";
ActionListener task = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
Vector<File> list = new Vector<File>();
System.out.println("\nListing files ...");
try {
listFilesRecurse(pathtofiles, new String[]{"jpg", "png", "jpeg"}, list);
} catch (IOException e) {
e.printStackTrace();
}
for(int index=0; index<list.size(); index++) {
String file = list.get(index).getAbsolutePath();
System.out.println("\nLoading image - " + index + ": " + file);
//mn.showDialog(mn.frame, file);
CardPrinter cp=null;
try {
cp = CardPrinter.createDialog(mn.frame, "Max",
"Muster", "1122", "12345678", "01/2018", file);
} catch (Exception e) {
e.printStackTrace();
continue; //break; //return;
}
cp.setVisible(true);
cp.dispose();
}
}
};
final Timer myTimer = new Timer(100, task);
myTimer.setRepeats(true);
JFrame frame = new JFrame("JFrame Example");
mn.frame = frame;
JPanel panel = new JPanel();
panel.setLayout(new FlowLayout());
JLabel label = new JLabel("This is a label!");
JButton button = new JButton();
button.setText("Press me");
button.addActionListener( new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
myTimer.start();
}
});
panel.add(label);
panel.add(button);
frame.add(panel);
frame.setSize(300, 300);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
//opens the dialog that display an image (file).
public void showDialog(JFrame fr, String file) {
ImageDialog imgd = new ImageDialog(fr, "Testdialog", file);
imgd.setSize(300, 300);
imgd.setModal(true);
imgd.setLocation(250, 250);
imgd.setVisible(true);
}
}
package test;
/*ImageDialog.java*/
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.Timer;
import org.monte.cmykdemo.CMYKJPEGImage;
public class ImageDialog extends JDialog {
String file;
public ImageDialog(JFrame frame, String title, String file) {
super(frame, title);
this.file = file;
//######For debugging only. This will close the dialog window after 300 ms (by calling ImageDialog.this.setVisible(false);).
ActionListener task = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
ImageDialog.this.dispose();
}
};
Timer cl = new Timer(300, task);
cl.start();
//#######
}
//renders the picture on screen.
#Override
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
setRenderingHints(g2d);
BufferedImage img=null;
try {
img = loadPicture(this.file);
} catch (IOException e) {
e.printStackTrace();
}
g2d.setColor(Color.BLUE);
g2d.drawRect(0, 0, this.getWidth(), this.getHeight());
g2d.drawImage(img, 10, 10, 80, 80, null, null);
}
void setRenderingHints(Graphics2D g2) {
g2.addRenderingHints(new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY));
g2.addRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON));
g2.addRenderingHints(new RenderingHints(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON));
}
public static BufferedImage loadPicture(String fullpath) throws IOException {
System.out.println("\nloadPicture(): " + fullpath);
//BufferedImage img = (BufferedImage) CMYKJPEGImage.loadImage( fullpath );
BufferedImage img = (BufferedImage) ImageIO.read( new File(fullpath) );
return img;
}
}
package test;
/*CardPrinter.java*/
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.print.PageFormat;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.OverlayLayout;
import javax.swing.Timer;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.BorderFactory;
import javax.swing.JButton;
public class CardPrinter extends JDialog /*implements Printable*/ {
protected JPanel jp;
protected JTextField tx;
protected JLabel lblCounter;
protected IDCardLayout idcard;
protected String vorname, nachname, id, gueltig, bild;
protected String chipid;
protected CardPrinter(Window owner, String vorname, String nachname, String id, String chipid,
String gueltig, String bild /*, DataReceiver drv*/) throws IOException {
super((Window)owner, "Assign_ChipID_DialogObject");
this.bild = bild;
//this.datareceiver = drv;
setTitle("Assign ID");
setModalityType(JDialog.DEFAULT_MODALITY_TYPE);
setResizable(false);
jp = new JPanel();
jp.setLayout(null);
jp.setOpaque(false);
addIDCard();
//setupButtons();
//setSize(this.getPreferredSize().width, this.getPreferredSize().height);
setSize(250, 250); //+++
setLocation(300, 300); //+++
//Overlay components: tx overlaps idcard
JPanel cnt = new JPanel();
cnt.setLayout(new OverlayLayout(cnt));
cnt.add(jp);
getContentPane().add(cnt);
setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
//######For debugging only. This will close the dialog window after 300 ms (by calling CardPrinter.this.setVisible(false);).
ActionListener task = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
CardPrinter.this.setVisible(false);
}
};
Timer closeWnd = new Timer(300, task);
closeWnd.start();
//######
}
//use this to create an instance of this class.
public static CardPrinter createDialog(Window owner, String vorname,
String nachname, String id, String chipid, String gueltig, String bild /*, DataReceiver drv*/) throws IOException {
return new CardPrinter(owner, vorname, nachname, id, chipid, gueltig, bild /*, drv*/);
}
protected void addIDCard() throws IOException {
int idcard_move_vert=15, idcard_move_hor=76;
tx = new JTextField(this.chipid, 8);
jp.add(tx);
tx.setBounds(idcard_move_hor+130, idcard_move_vert+6, 70, 20);
Border border = BorderFactory.createLineBorder(Color.RED);
tx.setBorder(border);
tx.requestFocus();
lblCounter = new JLabel("");
lblCounter.setBounds(idcard_move_hor+270, idcard_move_vert-6, 40, 30);
jp.add(lblCounter);
lblCounter.requestFocus();
System.out.println("\naddIDCard() ...");
BufferedImage picture = IDCardLayout.loadPicture(this.bild);
idcard = new IDCardLayout(/*this.vorname, this.nachname, this.id,*/ picture, this.bild /*, this.gueltig*/);
idcard.setLayout(null);
//idcard.setBounds(idcard_move_hor, idcard_move_vert, idcard.getPreferredSize().width, idcard.getPreferredSize().height);
idcard.setBounds(idcard_move_hor, idcard_move_vert, 50, 60);
idcard.setBorder( new LineBorder(Color.BLACK) );
jp.add(idcard);
//repaint();
}
}
package test;
/*IDCardLayout.java*/
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JPanel;
import org.monte.cmykdemo.CMYKJPEGImage;
public class IDCardLayout extends JPanel {
private BufferedImage bild;
private String bildfile;
public IDCardLayout(BufferedImage photo, String bildfile) {
this.bild = photo;
this.bildfile = bildfile;
}
/**
* Render graphics to the screen.
*/
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
System.out.println("\npaintComponent() ...");
prepareGraphics(g2d);
}
public static BufferedImage loadPicture(String fullpath) throws IOException {
//BufferedImage img = (BufferedImage) CMYKJPEGImage.loadImage( f.getAbsolutePath() );
BufferedImage img = (BufferedImage) ImageIO.read( new File(fullpath) );
return img;
}
//changing the rendering hints has no effect on Outofmemory-exception.
protected void setRenderingHints(Graphics2D g2, boolean normalText) {
if(true) {
g2.addRenderingHints(new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY));
g2.addRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON));
g2.addRenderingHints(new RenderingHints(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON));
}
}
/**
* Renders graphics to the screen.
*/
protected void prepareGraphics(Graphics2D g2) {
setRenderingHints(g2, true);
double newHeight = 60;
double scwidth = ( ((double)newHeight / (double)this.bild.getHeight()) ) * (double)this.bild.getWidth();
System.out.println("\nprepareGraphics() ..." + this.bildfile);
g2.drawImage(this.bild, 5, 5,
(int)scwidth,
(int)newHeight,
null, null);
}
}

The problem is solved. I don't use the class OverlayLayout anymore. The layout looks quite different, but now it works.

Use wait() in Java

I need to create a new JFrame in a new Thread.. When I close the JFrame I need to return a String.
The problem is that the wait() method "doesn't wait" the "notify()" of new Thread.
Thank's for your answer.
import java.awt.Button;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.LayoutManager;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class FinestraTesto extends Thread {
JLabel jdescr;
JTextArea testo;
JPanel pannelloTasti;
JButton bottoneInvio;
JButton bottoneAnnulla;
JFrame finestraTestuale;
JPanel panAll;
static Boolean pause = true;
String titolo;
String descrizione;
private static String testoScritto = "";
public String mostra() {
// Create a new thread
Thread th = new Thread(new FinestraTesto(titolo, descrizione));
th.start();
synchronized (th) {
try {
// Waiting the end of th.
th.wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return testoScritto;
}
public void run() {
synchronized (this) {
System.out.println("Fatto 1 thread");
finestraTestuale = new JFrame(titolo);
finestraTestuale.setPreferredSize(new Dimension(600, 200));
finestraTestuale.setSize(600, 200);
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
finestraTestuale.setLocation(
dim.width / 2 - finestraTestuale.getSize().width / 2,
dim.height / 2 - finestraTestuale.getSize().height / 2);
panAll = new JPanel();
panAll.setLayout(new BoxLayout(panAll, BoxLayout.Y_AXIS));
bottoneInvio = new JButton("Conferma");
bottoneAnnulla = new JButton("Annulla");
pannelloTasti = new JPanel();
testo = new JTextArea();
testo.setPreferredSize(new Dimension(550, 100));
testo.setSize(550, 100);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setViewportView(testo);
jdescr = new JLabel(descrizione);
jdescr.setPreferredSize(new Dimension(550, 50));
jdescr.setSize(550, 50);
pannelloTasti.setLayout(new BoxLayout(pannelloTasti,
BoxLayout.X_AXIS));
pannelloTasti.add(bottoneInvio);
pannelloTasti.add(bottoneAnnulla);
panAll.add(jdescr);
panAll.add(scrollPane);
panAll.add(pannelloTasti);
finestraTestuale.add(panAll);
bottoneInvio.addActionListener(new ActionListener() {
#Override
/**
* metodo attivato quando c'è un'azione sul bottone
*/
public void actionPerformed(ActionEvent arg0) {
testoScritto = testo.getText();
pause = false;
finestraTestuale.show(false);
// send notify
notify();
}
});
bottoneAnnulla.addActionListener(new ActionListener() {
#Override
/**
* metodo attivato quando c'è un'azione sul bottone
*/
public void actionPerformed(ActionEvent arg0) {
pause = false;
testoScritto = "";
finestraTestuale.show(false);
// send notify
notify();
}
});
finestraTestuale.show();
}
}
public FinestraTesto(String titolo, String descrizione) {
this.titolo = titolo;
this.descrizione = descrizione;
}
}

You would better to use Synchronizers instead of wait and notify. They're more preferable because of simplicity and safety.
Given the difficulty of using wait and notify correctly, you should
use the higher-level concurrency utilities instead.
Effective Java (2nd Edition), Item 69

I solved with this class:
import java.awt.Dimension;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JRootPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class CustomDialog
{
private List<JComponent> components;
private String title;
private int messageType;
private JRootPane rootPane;
private String[] options;
private int optionIndex;
private JTextArea testo;
public CustomDialog(String title,String descrizione)
{
components = new ArrayList<>();
setTitle(title);
setMessageType(JOptionPane.PLAIN_MESSAGE);
addMessageText(descrizione);
testo = new JTextArea();
testo.setPreferredSize(new Dimension(550, 100));
testo.setSize(550, 100);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setViewportView(testo);
addComponent(scrollPane);
setRootPane(null);
setOptions(new String[] { "Send", "Cancel" });
setOptionSelection(0);
}
public void setTitle(String title)
{
this.title = title;
}
public void setMessageType(int messageType)
{
this.messageType = messageType;
}
public void addComponent(JComponent component)
{
components.add(component);
}
public void addMessageText(String messageText)
{
components.add(new JLabel(messageText));
}
public void setRootPane(JRootPane rootPane)
{
this.rootPane = rootPane;
}
public void setOptions(String[] options)
{
this.options = options;
}
public void setOptionSelection(int optionIndex)
{
this.optionIndex = optionIndex;
}
public String show()
{
int optionType = JOptionPane.OK_CANCEL_OPTION;
Object optionSelection = null;
if(options.length != 0)
{
optionSelection = options[optionIndex];
}
int selection = JOptionPane.showOptionDialog(rootPane,
components.toArray(), title, optionType, messageType, null,
options, optionSelection);
if(selection == 0)
return testo.getText();
else
return null;
}
}