I have a problem to display multiple line in Jlabel. I tried to use html tag and that didn't helped me. I just wonder why the following code is not working. I used <br> tag and till it displays in one line.
Any help please...
My Java code is the following
package p1;
import javax.swing.*;
import java.awt.*;
public class MemoryUtil
{
private static final int MegaBytes = 10241024;
public static void main(String args[])
{
long freeMemory = Runtime.getRuntime().freeMemory()/MegaBytes;
long totalMemory = Runtime.getRuntime().totalMemory()/MegaBytes;
long maxMemory = Runtime.getRuntime().maxMemory()/MegaBytes;
String data="";
data= data + " <html> JVM Free Memory: " + Long.toString(freeMemory)+" MB <br>";
data=data + "Initial Heap Size of JVM : "+ Long.toString(totalMemory) +" MB <br>";
data= data + " Maximum Heap Size <br>of JVM: " + Long.toBinaryString(maxMemory) +" MB </html>";
createAndShowGUI(data);
}
private static void createAndShowGUI(String input)
{
JFrame frame = new JFrame("JVM Setting of your Machine ");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout( new GridLayout());
frame.setSize(new Dimension(450, 400));
frame.setLocation(new Point(400, 200));
frame.setResizable(true);
JLabel label = new JLabel(input);
label.setFont(new Font("Serif", Font.BOLD, 20));
label.setHorizontalAlignment(JLabel.CENTER);
frame.add(label);
frame.setVisible(true);
}
}
data + " <html> JVM Free Memory: "
Should be more along the lines of:
"<html><body>JVM Free Memory: "
It requires the <html> element to be the 1st part of the String.
Best practice would be to make it valid HTML by adding the <body> prefix.
You have a white space in front of <HTML>. remove it and it works :data= data + "<html> JVM
Related
I want to use this JXDatePicker component in a application that will work on a touch display. Because the default component is small, all the dates and the buttons are hard to click using a bad touch screen I wanted to make them bigger. So far I successfully made the result text field bigger (the one showing the selected date, by changing the font), make the pop-up bigger (the JXMonthView, also by changing its font), change the picture of the JXDatePicker with a bigger image, set the default date to be the current date, set the date format, etc. This is my code:
private void touch_screen_datepicker(JXDatePicker date_picker) {
Toolkit toolkit = Toolkit.getDefaultToolkit();
JXMonthView monthView = date_picker.getMonthView();
date_picker.setDate(new Date());
date_picker.setFont(new Font(Font.DIALOG, Font.PLAIN, 50));
JButton btn_pick = (JButton) date_picker.getComponent(1);
btn_pick.setBackground(new Color(66, 147, 223));
Image image = toolkit.getImage("/home/adrrian/Image/calendar/" + "calendar image 4.png"); //Земање на сликата за мк знаме
ImageIcon icon = new ImageIcon(image); //Правење на икона
btn_pick.setIcon(icon); //Поставување на иконата
SimpleDateFormat longFormat = new SimpleDateFormat("yyyy-MM-dd");
SimpleDateFormat shortFormat = new SimpleDateFormat("yy-MM-dd");
Date startDate = new Date(0);//01.01.1970
shortFormat.set2DigitYearStart(startDate);
DatePickerFormatter formatter = new DatePickerFormatter(
// invers sequence for parsing to satisfy the year parsing rules
new DateFormat[]{shortFormat, longFormat}) {
#Override
public String valueToString(Object value) throws ParseException {
if (value == null) {
return null;
}
return getFormats()[1].format(value);
}
};
DefaultFormatterFactory factory = new DefaultFormatterFactory(formatter);
date_picker.getEditor().setFormatterFactory(factory);
monthView.setFont(new Font(Font.DIALOG, Font.PLAIN, 50));
monthView.setFirstDayOfWeek(Calendar.MONDAY);
}
and this is an image of my final work:
My main problem is how to make the arrow that are changing the months (for example if I go back from this image to show September). I tried listing all of the components, like I did for the button, but still I didn't found anything. Also for better GUI I like to find that dark blue color (where the month is displayed), to make my button the same.
Hope someone can help me. Thanks in advance.
Toolkit toolkit = Toolkit.getDefaultToolkit();
JXMonthView monthView = date_picker.getMonthView();
/*EDITED*/
//1
date_picker.putClientProperty("JComponent.sizeVariant", "large");
monthView.putClientProperty("JComponent.sizeVariant", "large");
//2
date_picker.putClientProperty("JXComponent.sizeVariant", "large");
monthView.putClientProperty("JXComponent.sizeVariant", "large");
//3
date_picker.putClientProperty("JXDatePicker.sizeVariant", "large");
monthView.putClientProperty("JXMonthView.sizeVariant", "large");
//
date_picker.putClientProperty("JDatePicker.sizeVariant", "large");
monthView.putClientProperty("JMonthView.sizeVariant", "large");
SwingUtilities.updateComponentTreeUI(this);
SwingUtilities.updateComponentTreeUI(date_picker);
SwingUtilities.updateComponentTreeUI(monthView);
date_picker.updateUI();
monthView.updateUI();
/*EDITED*/
As #Vighanesh Gursale suggested I insterdet this lines and also did the frame.pack() before setVisible(true), but nothing changes.
I have made some code using nimbus look and feel, i know it is not exact that you want but it is pretty much helpful. Check this code. To perform same you need to find the key of your next and previous buttons key in my case it is Button.margin. Try to use the same key in your code if you are lucky it would work.
import javax.swing.*;
import java.awt.*;
public class Demo {
JFrame frame = new JFrame("");
JButton btn = new JButton("Example");
public Demo() {
frame.setSize(400, 400);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new FlowLayout());
frame.add(btn);
frame.setVisible(true);
}
public static void main(String[] args) {
try
{
UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
Insets insets = new Insets(50, 20, 50, 20); //change the size of button
UIManager.put("Button.margin", insets);
}
catch(Exception e)
{
e.printStackTrace();
}
Demo d = new Demo();
}
}
Also keep in mind to use default look and feel or any other look and feel.
This question is quite old but for everyone who is looking how it can be done
UIManager.put("JXMonthView.monthDownFileName", <PATH_TO_IMAGE>);
UIManager.put("JXMonthView.monthUpFileName", <PATH_TO_IMAGE>);
monthDownFileName refers to previous month
monthUpFileName refers to next month
this will change the image with other of your choice (and size)
I'm trying to call a method from a class called Circle in my project which displays some basic information about the object in a JLabel. For some reason the text won't go to a new line even when I use HTML to try and format it:
#Override
public String toString(){
return "<html>Type: " + this.getClass().getSimpleName() + "<br>Radius: " + getRadius() + "<br>Area: " + df.format(getArea()) + "<br>Perimeter: </html>" + df.format(getPerimeter());
}
I'm trying to display the info with this code:
#Override
public void actionPerformed(ActionEvent ae) {
if(ae.getSource()==btnCalc && x==1){
//create object
double R = Double.parseDouble(Txt1.getText());
Circle circ = new Circle(R);
lblResult.setText(circ.toString());
}
When I run the program it just returns this:<html>Type: Circle<br>Radius: 4.0<br>Area: 50.27<br>Perimeter:</html> 25.13
edit: I tried just setting the text as an exception message instead of calling the method and it didn't work this way either
edit: Now this happens when I try to run the cylinder-sphere classes, but it doesn't do that when I don't have any html in the toString() method.
Turns out I was using a DecimalFormat in the last four classes which was what was giving me the exception. Once I got rid of that, the strings formatted nicely using a JTextPane instead of a JtextField.
From the image you pasted, it looks like it is a text INPUT control (under Show Info button), like JTextField and not a JLabel.
You can use HTML content with JLabel constructor as well as with its setText method too. It works fine.
JLabel lbl = new JLabel("<html>Type: Circle<br>Some info<br>More info</html>")
JLabel lbl2 = new JLabel();
lbl2.setText("<html>Type: Circle<br>Some info<br>More info</html>")
But if you want to have an INPUT control (as in your image), you can not use HTML with JTextField. You have to use JTextPane for this.
JTextPane txt = new JTextPane();
txt.setContentType("text/html");
txt.setText("<html>Type: Circle<br>Some info<br>More info</html>");
I'm trying to put a scrolling text area, called descriptionScroll. However, the scroll bar is NOT visible. I've tried many approaches, and all end in frustration.
Am I missing anything to get the scroll bar showing? It should appear to the right of the large text box next to "Description"
Here's the relevant piece of code:
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
protected JTextArea descriptionTextArea;
protected JScrollPane descriptionScroll;
String descriptionText =
"Lot ID(s):\n" +
"Wafer ID(s):\n" +
"PSPT(Probe Ship Part Type):\n" +
"Tester:\n" +
"Tester Job Name:\n" +
"PID (FPP, FPC):\n" +
"Reprobe required before shipping lot? (Y/N)\n\n" +
"Hold for (individual):\n" +
"Hold for (group)\n" +
"Expected release date\n" +
"Hold Comments:\n\n" +
"Shipping Information:\n" +
"Special Instructions:\n";
public Constructor(){
descriptionTextArea = new JTextArea(descriptionText);
descriptionScroll = new JScrollPane(descriptionTextArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
add(descriptionTextArea);
add(descriptionScroll);
pack();
setSize(790, 625);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
descriptionTextArea.setSize(650, 200);
descriptionTextArea.setLocation(110, 228);
descriptionTextArea.setLineWrap(true);
}
You're adding both JScrollPane and JTextArea to the same container. Add the JTextArea to JScrollPane:
descriptionScroll.add(descriptionTextArea);
I'm creating a short program that involves a guest and a tabbed pane. I want to program the JTabbedPane so when I click on a certain tab, the guest's information will be displayed using the JComponent makeTextPanel function. However, it seems to ignore the '\n' (new line) when it runs. Is there any way to fix this?
This is my GUI:
JTabbedPane overview= new JTabbedPane();
JComponent accountinfo= makeTextPanel (guest.toString());
overview.addTab ("Account Overview", accountinfo);
overview.setMnemonicAt(0, KeyEvent.VK_1);
JFrame tabbed= new JFrame("AIR Reservation");
tabbed.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
tabbed.add(overview);
tabbed.setSize(500,300);
tabbed.setLocationRelativeTo(null);
tabbed.setVisible(true);
This is the toString method for my Customer class:
public String toString()
{
customerstring= "Name: " + getName();
customerstring+= "\nGender: " + getGender();
customerstring+= "\nDate of Birth: " + getBirthDate();
customerstring+= "\nPassport number: " + getPassportNumber();
customerstring+= "\nBalance: " + getMoney();
return customerstring;
}
Thanks for the help!
Edit: here's the makeTextPanel method:
protected JComponent makeTextPanel(String text)
{
JPanel panel = new JPanel(false);
JLabel filler = new JLabel(text);
filler.setHorizontalAlignment(JLabel.CENTER);
panel.setLayout(new GridLayout(1, 1));
panel.add(filler);
return panel;
}
Your panel contains a JLabel that has as a text the one you pass in the makeTextPanel as an argument. A JLabel can have multiple lines if the text is in html format.
So your text should be encapsulated inside <html></html> and the line separator should be <br>.
Other option would be to use a JTextArea or a JEditorPane instead of JLabel. You can set them non-editable, if needed.
After a very long couple of days I have determined that there is a delay when displaying text very quickly in a text area if that text area is in a border layout. My question is, why does the following code take 10-20 times longer to execute using border layout than without (comment out one of the two methods either addWithBorderLayout or addWithoutBorderLayout) AND is there a way to use the border layout without this delay? (The problem exists with or without the SwingUtilities invokeLater() method.)
import java.awt.BorderLayout;
import java.awt.Label;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import javax.swing.JDesktopPane;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JScrollPane;
import javax.swing.WindowConstants;
public class Driver
{
public static void main(String args[])
{
System.out.println("JEditPane Test");
//window to display the plyed back text
JFrame mainFrame = new JFrame("Main Frame");
//holds some text to be played back
final JEditorPane editPane1 = new JEditorPane();
final JEditorPane editPane2 = new JEditorPane();
//desktop pane to hold docs
JDesktopPane desktopPane = new JDesktopPane();
//create an internal frame
JInternalFrame internalFrame1 = new JInternalFrame("Test Doc 1", true, true, true, true);
internalFrame1.setContentPane(new JScrollPane(editPane1));
internalFrame1.setSize(400, 400);
internalFrame1.setVisible(true);
internalFrame1.setLocation(0, 0);
JInternalFrame internalFrame2 = new JInternalFrame("Test Doc 2", true, true, true, true);
internalFrame2.setContentPane(new JScrollPane(editPane2));
internalFrame2.setSize(400, 400);
internalFrame2.setVisible(true);
internalFrame2.setLocation(400, 0);
//add it to the desktop
desktopPane.add(internalFrame1);
desktopPane.add(internalFrame2);
//map of editor panes
final Map < String, JEditorPane > mapOfPanes = new HashMap < String, JEditorPane >();
mapOfPanes.put("1", editPane1);
mapOfPanes.put("2", editPane2);
//COMMENT ONE OF THESE TWO OUT!!!
addWithBorderLayout(mainFrame, desktopPane);
//addWithoutBorderLayout(mainFrame, desktopPane);
//for closing
mainFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
//set the size and location of the window
mainFrame.setSize(800,500);
mainFrame.setLocation(100, 100);
//make the window visible
mainFrame.setVisible(true);
//create some text to display
StringBuilder builder = new StringBuilder();
builder.append("This is a rather long string of text. ");
//build up a good amount of text
for(int i = 0;i < 5;i++)
{
//copy it a few times
builder.append(builder.toString());
}
//get the string
final String longStringOfText = builder.toString();
//create a thread to call setText on the editor pane
Thread thread = new Thread(new Runnable()
{
#Override
public void run()
{
//for gathering stats
int sum = 0;
int numberOfCharsToPrintFromString = 0;
Date prev = new Date();
Date current = new Date();
System.out.println("Num Panes: " + mapOfPanes.size());
//for each pane
for(JEditorPane pane : mapOfPanes.values())
{
//to help in printing subsections of the big string
numberOfCharsToPrintFromString = 0;
while(numberOfCharsToPrintFromString < longStringOfText.length())
{
//wait a short amount of time
try{Thread.sleep(1);}catch(Exception e){}
//grab sections of the long string
String text = longStringOfText.substring(0, numberOfCharsToPrintFromString);
//set the text of the pane
pane.setText(text);
//stats
numberOfCharsToPrintFromString++;
long diff = current.getTime() - prev.getTime();
sum = sum + (int)diff;
prev = current;
current = new Date();
}
}
System.out.println("Average time in between events: " + ((double)sum/(double)numberOfCharsToPrintFromString));
}
});
thread.start();
}
private static void addWithoutBorderLayout(JFrame mainFrame, JDesktopPane desktopPane)
{
mainFrame.add(desktopPane);
}
private static void addWithBorderLayout(JFrame mainFrame, JDesktopPane desktopPane)
{
mainFrame.setLayout(new BorderLayout());
mainFrame.add(new Label("Top Panel"), BorderLayout.NORTH);
mainFrame.add(desktopPane, BorderLayout.CENTER);
mainFrame.add(new Label("Bottom Panel"), BorderLayout.SOUTH);
}
}
On Mac OS X 10.5.8 using Java version 1.6, I see a comparable disparity unless I set apple.awt.graphics.UseQuartz at the beginning of main(). Here is a related example that affects font rendering quality rather than execution time.
if (System.getProperty("os.name").startsWith("Mac OS X")) {
System.setProperty("apple.awt.graphics.UseQuartz", "true");
}
I use JDK6_17 on XP with an older computer and don't notice the difference you experience. My timings where betweenn 20-22 in both cases.
I then changed the sleep time to 10ms and the timings are remarkably similiar.
For the default layout:
Average time in between events: 31.236842105263158
Average time in between events: 31.236842105263158
Average time in between events: 31.236842105263158
For the Border layout:
Average time in between events: 31.236842105263158
Average time in between events: 31.23766447368421
Average time in between events: 31.236842105263158
In fact I can't believe they are identical in 5 of 6 cases.
By default the content pane of a JFrame does use a BorderLayout. So when you add components to the frame all you need to do is:
frame.add(topComponent, BorderLayout.NORTH);
frame.add(centerComponent);
frame.add(bottomComponent, BorderLayout.SOUTH);
and the frame will add the components to the content pane at the proper location.
Why are you changing the layout of the frame, instead of the content pane. Normally you would only ever change the layout of the content pane. The root pane of the frame is use to hold the menu bar and the content pane. So maybe you change the default layout manager of the entire frame you are causing some problems?