Method to clear a GUI?
Hi,
Well I know I posted another topic with another problem a few hours ago, but I was wondering this for sometime now, is there a method to clear a whole GUI?
The program I'm making is a memory/cache simulation and needs some graphic elements that's why I'm doing it that way and with netbeans.
But anyways my question is, can I just add a button that will clear like the whole frame?
I know I can just put for example:
fieldA.setText("");
fieldB.setText("");But just wondering if there is a way like ClearFrame or something like that?
Thanks in advance
petes1234 wrote:
You could also get an array of all the components in a Container with the getComponents() method and then iterate through the array calling setText("") if the child component happens to be a JTextComponent, but this makes me nervous as you may in the future have some textcomponents that you don't want to clear, but this method won't allow you to keep components out of the iteration loop.Yeah I was looking into that, but I think I'll go with the list of fields rather than with components, I might end up screwing up something there =P
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I need the method call
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Regards. -
Have tried all the different methods to clear cache, but none of them work.
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Hi John,
Thanks for your reply.
Yes, I have followed the instructions under How to clear the cache, as well as those under Clear Recent History. Options - Advanced - Network - Offline Storage - Clear Now. In addition, my settings specify to clear cache upon closing Firefox. Nothing is working at this point (and hasn't for months, although it used to a long time ago).
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Kristina -
Unable to clear text Field in Multi Screen JFrame GUI Application
i am working with a Swing GUI project where I want to accept user input in a
text field
I have used singleton pattern which will create only one instance of object
due to this when i move from one scree to another the input of textfield
doesnt updated I have used setText method to clear the JTextField but it wont
works
Program one -- 1st screen
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.SwingUtilities;
import java.awt.event.*;
import javax.swing.JTextField;
public class Frame1 extends JFrame
public static Frame1 frame1;
public JButton button;
public JTextField input;
public static Frame1 getInstance()
if(frame1==null)
frame1 = new Frame1();
return frame1;
public JButton getJButton(String mytext)
JButton button = new JButton();
button.setText(mytext);
button.setBounds(450,450,150,50);
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JPanel panel = new JPanel();
panel.setLayout(null);
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add(panel);
setUndecorated(true);
setSize(1024, 768);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
public void addActionListener(Object obj)
try{
JButton button1 = (JButton)obj;
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae)
String text = "";
input.insert("", 0);
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dispose();
catch(Exception e1)
System.out.println("Exception==> "+e1.toString());
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Frame1.getInstance().myGUI();
Frame1.getInstance().repaint();
program 2 - 2nd screen
import javax.swing.JFrame;
import javax.swing.JPanel;
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.SwingUtilities;
import java.awt.event.*;
import javax.swing.JTextField;
public class Frame2 extends JFrame
static Frame2 frame2;
public JButton BackButton;
public JTextField input;
public static Frame2 getInstance()
if(frame2==null)
frame2 = new Frame2();
return frame2;
public JButton getJButton(String mytext)
JButton button = new JButton();
button.setText(mytext);
button.setBounds(450,450,150,50);
return button;
public void addActionListener(Object obj)
try{
JButton BackButton1 = (JButton)obj;
BackButton.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
input.setText("");
Frame1.getInstance().myGUI();
Frame1.getInstance().repaint();
dispose();
catch(Exception e2)
System.out.println("Exception==> "+e2.toString());
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panel2.setLayout(null);
BackButton = getJButton("2nd Screen");
addActionListener(BackButton);
input = new JTextField(10);
input.setBounds(200,300,100,30);
panel2.add(input);
panel2.add(BackButton);
add(panel2);
setUndecorated(true);
setSize(1024, 768);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
In this application the status of TextField input remain same means it shows
the earlier input in the textfield wnen I come to earlier or next screen.
what is the solution to clear the TextField input while moving from 1st
scrren to 2nd screen.multiple screens = multiple posts
well done indeed - just another farking cross-poster
[http://www.coderanch.com/t/492998/Swing-AWT-SWT-JFace/java/unable-clear-text-box-Multi#2218566] -
Hi,
public void someMethod( )
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basically if i want to make this method to execute the GUI first and wait until the GUI reach certain state (let's say exit the GUI itself) before calling some other methods, how can I do that ?bad idea. I've seen many small (often school assignements) where they need to show a dialog and wait for input, and then continue with the execution. Mvc is often overkill for those situations.
/KAj -
Using JTextArea - How do I clear it?
Hi all.
I have written a GUI program which transfers data from a method to a JTextArea/JScrollPane upon a button ActionEvent.
When I press the "Next Record" button I want to be able to clear the previous details held in this JTextArea before I print the new ones in it. The Same for going backwards through an array. Does anybody know how to do this?
Currently I am using the append method to add the returned String to my JTextArea. I have also tried using a replaceRange(String, int, int) method to clear the box before printing new details, but this isn't working properly as each Record in the array contains a different String length, so I can not enter the int values for each specific object.
Below is the code for the application, and I've highlighted where I have used the methods to add a String to the JTextArea. I'm declaring the class for the action event within creating the actionListener, but can seperate it out if people need to see it more clearly.
RECORDING CLASS ----------
package RecordingManagerGUI;
public class Recording
private String title, artist, genre;
public Recording (String theTitle, String theArtist, String theGenre)
title = theTitle;
artist = theArtist;
genre = theGenre;
public String getAlbum()
return title;
public String getArtist()
return artist;
public String getGenre()
return genre;
public String toString()
String s = "Title: " + title + "\nArtist: " + artist + "\nGenre: " + genre + "\n\n";
return s;
}MANAGER CLASS ---------------
package RecordingManagerGUI;
import java.util.*;
public class Manager
private Recording[] theRecordings;
private int numRecordings, maxRecordings, age;
private String managerName;
//Extending the Manager Class Instance Variables
private int current = 0;
private String record;
public Manager (String theName, int theAge, int max)
managerName = theName;
age = theAge;
maxRecordings = max;
numRecordings = 0;
theRecordings = new Recording[maxRecordings];
public boolean addRecording (Recording newRecording)
if (numRecordings == maxRecordings)
System.out.println("The store is full");
return false;
else
theRecordings[numRecordings] = newRecording;
numRecordings++;
return true;
public int nextRecording ()
if(current < numRecordings)
current += 1;
else
record = "You have reached the end of the Records"; //initialise the string if no records
return current;
public int previousRecording()
if(current > 1)
current -= 1;
else
record = "You have reached the start of the Records"; //initialise the string if no records
return current;
public String displayCurrent()
String displayRec = "";
displayRec += theRecordings[current-1];
return displayRec;
public void displayDetails()
System.out.println("Manager Name: " + managerName + ", " + age);
//public void displayRecordings()
// System.out.println("\nThe Recordings: ");
// for (int i = 0; i < numRecordings; ++i)
// System.out.println(theRecordings);
}RecordingManagerGUI CLASS ----------/*
*Need to add a Label which tells me when I have reached the end of the Records
package RecordingManagerGUI;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class RecordingManagerGUI extends JFrame {
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
JButton nextRecord;
JButton previousRecord;
JLabel recordLabel;
JTextArea displayRecord;
Manager theManager;
public RecordingManagerGUI() {
//Create and set up the window.
super("Recording Manager Application");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Recording FooFighters = new Recording("The Colour and the Shape", "Foo Fighters", "Rock");
Recording BlindMelon = new Recording("Blind Melon", "Blind Melon", "Alternative Rock");
Recording JoeSatriani = new Recording("The Extremist", "Joe Satriani", "Instrumental Rock");
Recording PercySledge = new Recording("When a Man Loves a Woman", "Percy Sledge", "Soul");
Recording JustinTimberlake = new Recording("Justified", "Justin Timberlake", "Pop");
Recording BeyonceKnowles = new Recording("Dangerously in Love", "Beyonce Knowles", "R'n'B");
Recording TupacShakur = new Recording("2Pacalypse Now", "Tupac Shakur", "Hip Hop");
theManager = new Manager("Cathy", 42, 7);
theManager.addRecording(FooFighters);
theManager.addRecording(BlindMelon);
theManager.addRecording(JoeSatriani);
theManager.addRecording(PercySledge);
theManager.addRecording(JustinTimberlake);
theManager.addRecording(BeyonceKnowles);
theManager.addRecording(TupacShakur);
displayRecord = new JTextArea(10, 30);
displayRecord.setEditable(false);
JScrollPane recordScroll = new JScrollPane(displayRecord);
recordLabel = new JLabel("Record Details");
nextRecord = new JButton("Next Record");
nextRecord.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){theManager.nextRecording();displayRecord.append(theManager.displayCurrent());displayRecord.replaceRange(theManager.displayCurrent(), 0, 30);}}); //ADDING STRING TO JTEXTAREA
previousRecord = new JButton("Previous Record");
previousRecord.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){theManager.previousRecording();displayRecord.replaceRange(theManager.displayCurrent(), 0, 30);}}); //ADDING STRING TO JTEXTAREA
getContentPane().setLayout(new FlowLayout());
getContentPane().add(recordLabel);
getContentPane().add(recordScroll);
getContentPane().add(nextRecord);
getContentPane().add(previousRecord);
//Display the window.
pack();
setVisible(true);
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
new RecordingManagerGUI();
}Would appreciate any help thanks. I'm not sure if I just need to create a new instance of the JTextArea upon the event which would hold the String information. If so I'm not really sure how to do this.I don't know, the Swing experts are in the Swing forum. but setText() is defined in TextComponent, which a JTextArea is.
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JFormattedTextField: Clearing text
Hello All,
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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.text.*;
public class GUITest
public static void main( String args[] )
JFrame frame = new TestFrame();
frame.show();
class TestFrame extends JFrame implements ActionListener
private JFormattedTextField ssnText;
private JFormattedTextField dateText;
private JButton button;
public TestFrame()
setTitle( "GUI Test" );
setSize( 300, 200 );
addWindowListener( new WindowAdapter()
public void WindowClosingEvent( WindowEvent e )
System.exit( 0 );
button = new JButton( "Clear" );
button.addActionListener( this );
try
ssnText = new JFormattedTextField( new MaskFormatter( "###-##-####" ) );
dateText = new JFormattedTextField( new MaskFormatter( "##/##/## ##:##" ) );
} catch( Exception e ){}
getContentPane().setLayout( new FlowLayout() );
getContentPane().add( ssnText );
getContentPane().add( dateText );
getContentPane().add( button );
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System.out.println( "SSN = \"" + ssnText.getText() + "\"" );
System.out.println( "DATE = \"" + dateText.getText() + "\"" );
ssnText.setText( "" );
dateText.setText( "" );
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-gcTry this and see if it works:
ssnText.setText( " - - " ) ); //respect the ###-##-#### format
dateText.setText( " / / : : " ) );
or
ssnText.setValue( null );
dateText.setValue( null );
or
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Trying to pass and object variable to a method
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import javax.swing.JToolBar;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import java.net.URL;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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protected JTextArea myTextArea;
protected String newline = "\n";
static final private String FIRST = "first";
static final private String PREVIOUS = "previous";
static final private String NEXT = "next";
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super(new BorderLayout());
int counter = 0;
//Create the toolbar.
JToolBar myToolBar = new JToolBar( "Still draggable" );
addButtons( myToolBar );
//Create the text area used for output.
myTextArea = new JTextArea( 450, 190 );
myTextArea.setEditable( false );
JScrollPane scrollPane = new JScrollPane( myTextArea );
//Lay out the main panel.
setPreferredSize(new Dimension( 450, 190 ));
add( myToolBar, BorderLayout.PAGE_START );
add( scrollPane, BorderLayout.CENTER );
myTextArea.setText( packageData( myProduct, myOfficeSupplies, counter ) );
setCounter( counter );
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JButton myButton = null;
//first button
myButton = makeNavigationButton( FIRST, "Display first record", "First" );
myToolBar.add(myButton);
//second button
myButton = makeNavigationButton( PREVIOUS, "Display previous record", "Previous" );
myToolBar.add(myButton);
//third button
myButton = makeNavigationButton( NEXT, "Display next record", "Next" );
myToolBar.add(myButton);
} //End method addButtons
protected JButton makeNavigationButton( String actionCommand, String toolTipText, String altText )
//Create and initialize the button.
JButton myButton = new JButton();
myButton.setActionCommand( actionCommand );
myButton.setToolTipText( toolTipText );
myButton.addActionListener( this );
myButton.setText( altText );
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public void actionPerformed( ActionEvent e )
String cmd = e.getActionCommand();
// Handle each button.
if (FIRST.equals(cmd))
{ // first button clicked
int counter = 0;
setCounter( counter );
else if (PREVIOUS.equals(cmd))
{ // second button clicked
counter = getCounter();
if ( counter == 0 )
counter = 5; // 5 would be replaced with variable maxNumber
setCounter( counter );
else
counter = getCounter() - 1;
setCounter( counter );
else if (NEXT.equals(cmd))
{ // third button clicked
counter = getCounter();
if ( counter == 5 ) // 5 would be replaced with variable maxNumber
counter = 0;
setCounter( counter );
else
counter = getCounter() + 1;
setCounter( counter );
displayResult( counter );
} // End method actionPerformed
private int counter;
public void setCounter( int number ) // Declare setCounter method
counter = number; // stores the counter
} // End setCounter method
public int getCounter() // Declares getCounter method
return counter;
} // End method getCounter
protected void displayResult( int counter )
//Test statement
// myTextArea.setText( String.format( "%d", counter ) );
// How can I carry the myProduct and myOfficeSupplies variables into this method?
myTextArea.setText( packageData( product, officeSupplies, counter ) );
myTextArea.setCaretPosition(myTextArea.getDocument().getLength());
} // End method displayResult
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event dispatch thread.
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JFrame frame = new JFrame("Products");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Add content to the window.
frame.add(new Panel( myProduct, myOfficeSupplies, maxNumber ));
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frame.pack();
frame.setVisible( true );
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JTextArea myTextArea = new JTextArea(); // textarea to display output
JFrame JFrame = new JFrame( "Products" );
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myTextArea.append( packageData( myProduct, myOfficeSupplies, counter ) + "\n\n" );
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JFrame.add(scrollPane, BorderLayout.CENTER); // adds scrollpane to JFrame
JFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); // Sets program to exit on close
JFrame.setSize( 350, 170 ); // set frame size
JFrame.setVisible( true ); // display frame
} // End method displayData
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return String.format( "%s: %d\n%s: %s\n%s: %s\n%s: %s\n%s: $%.2f\n%s: $%.2f\n%s: $%.2f\n%s: $%.2f",
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"Product Name", myOfficeSupplies.getProductName( counter ),
"Product Brand",myProduct.getProductBrand( counter ),
"Number of Units in stock", myOfficeSupplies.getNumberUnits( counter ),
"Price per Unit", myOfficeSupplies.getUnitPrice( counter ),
"Total Value of Item in Stock is", myOfficeSupplies.getProductValue( counter ),
"Restock charge for this product is", myProduct.restockingFee( myOfficeSupplies.getProductValue( counter ) ),
"Total Value of Inventory plus restocking fee", myOfficeSupplies.getProductValue( counter )+
myProduct.restockingFee( myOfficeSupplies.getProductValue( counter ) ) );
} // end method packageData
} //End Class Panelmultarnc wrote:
My instructor has not been very forthcoming with assistance to her students leaving us to figure it out on our own.Aren't they all the same! Makes one wonder why they are called instructors. <sarcasm/>
Of course it's highly likely that enough information was imparted for any sincere, reasonably intelligent student to actually figure it out, and learn the subject in the process.
And if everything were spoonfed, how would one grade the performance of the students? Have them recite from memory
public class HelloWorld left-brace
indent public static void main left-parenthesis String left-bracket right-bracket args right-parenthesis left-brace
And everywhere that Mary went
The lamb was sure to go
db
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