So I have a simple GUI that can only open text files and should just display them in a text area to be edited. I know my string contains the files contents since I can print it out, but when I try and add it to my text area, it does not show up. I was wondering if this was a problem of overlapping text areas but I can't seem to find the error.
The first part of my code just creates the GUI. The other part should open a file and fill the text area with it. Where exactly is the problem and how do I fix it? Any help would be appreciated.
Here is part of my code which deals with creating the frames and panels:
public class MenuView extends JFrame {
private JPanel centerPanel;
private JPanel bottomPanel;
private JMenuBar menuBar;
private JMenu fileMenu;
private JMenuItem openItem;
private JMenuItem closeItem;
private JButton setButton;
private JTextField text;
private JTextArea label;
private JMenuItem fileNew;
public MenuView(){
super();
setSize(500, 400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
setTitle("Menu Demo");
//The center panel that will contain text
centerPanel = new JPanel();
centerPanel.setLayout(new FlowLayout());
label = new JTextArea(400,500);
centerPanel.add(label);
add(centerPanel, BorderLayout.CENTER);
//The bottom panel with the text field and button
bottomPanel = new JPanel();
bottomPanel.setLayout(new GridLayout(1, 2));
setButton = new JButton("Set Text");
text = new JTextField();
bottomPanel.add(setButton);
bottomPanel.add(text);
add(bottomPanel, BorderLayout.SOUTH);
//Setting up the menu
menuBar = new JMenuBar();
fileMenu = new JMenu("File");
fileNew = new JMenu("New");
openItem = new JMenuItem("Open");
closeItem = new JMenuItem("Exit");
fileMenu.add(openItem);
fileMenu.add(closeItem);
fileMenu.add(fileNew);
menuBar.add(fileMenu);
setJMenuBar(menuBar);
setButton.addActionListener(new ButtonCommand(label, text));
closeItem.addActionListener(new QuitMenuCommand());
openItem.addActionListener(new OpenMenuCommand(label));
}
public static void main(String [] args){
MenuView v = new MenuView();
v.setVisible(true);
}
}
Here is the code that deals with opening the files:
public class OpenMenuCommand implements ActionListener {
private JTextArea theLabel;
private JFileChooser fc;
private String k = "";
public OpenMenuCommand(JTextArea l){
theLabel = l;
theLabel.getParent();
fc = new JFileChooser();
fc.setFileFilter(new FileNameExtensionFilter("Text file", "txt"));
}
public void actionPerformed(ActionEvent e) {
StringBuffer text = new StringBuffer();
int returnValue = fc.showOpenDialog(null);
if(returnValue == fc.APPROVE_OPTION){
theLabel.removeAll();
File f = fc.getSelectedFile();
try{
BufferedReader inFile = new BufferedReader(new FileReader(f));
String in = inFile.readLine();
while(in != null){
k = k + in;
in = inFile.readLine();
}
System.out.println(k);
theLabel.setText(k);
inFile.close();
theLabel.setVisible(true);
}catch(FileNotFoundException exc){
//Should never trigger
}catch(IOException exc){
theLabel.setText("Error reading in file.");
}
}
}
}
Your stuff is being added to the JTextArea but you're not seeing due the size of the JTextArea. It's actually a friggin' big JTextArea:
label = new JTextArea(400, 500);
And by adding the huge JTextArea to a FlowLayout-using JPanel much of it is off the screen.
To see what I mean, add this to your actionPerformed method:
System.out.println(theLabel.getBounds());
You'll see that the width and height are tremendous, and what's more, the left side is a large negative number.
Solution: Make your JTextArea more reasonable size (see in the API what these numbers mean -- row and column, not points) and add it to a JScrollPane and then add that BorderLayout.CENTER to a BorderLayout using container.
For example, the small GUI SSCCE shows your JTextArea in a FlowLayout using JPanel on the left and my JTextArea inside of a JScrollPane on the right:
import java.awt.*;
import javax.swing.*;
public class MenuViewSSCCE {
private static final Dimension APP_SIZE = new Dimension(500, 400);
private static void createAndShowUI() {
JTextArea label = new JTextArea(400, 500); // friggin big!
JTextArea label2 = new JTextArea(400, 500); // friggin big!
label.setText("Look at how big this JTextArea is!");
label2.setText("Look at how big this JTextArea is!");
JPanel centerPanel = new JPanel();
centerPanel.setPreferredSize(APP_SIZE);
centerPanel.setLayout(new FlowLayout()); // this line is redundant
centerPanel.add(label);
JScrollPane myScrollpane = new JScrollPane(label2);
myScrollpane.setPreferredSize(APP_SIZE);
JPanel gridPanel = new JPanel(new GridLayout(1, 0));
gridPanel.add(centerPanel);
gridPanel.add(myScrollpane);
JFrame frame = new JFrame("Your code on left, mine on right");
frame.getContentPane().add(gridPanel, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowUI();
}
});
}
}
Related
I have a JTextArea named as txtChat which is used as the chatting area in my chatbot. I have created a JScrollPane scroll = new JScrollPane(txtChat) and added my txtChat inside the JScrollPane. My JTextArea is being put inside a Panel which has BorderLayout, so I have added my scroll to the panel which contains my JTextArea chatPanel.add(scroll, BorderLayout.East). BUT IT IS NOT WORKING! Like when my conversation go longer, the scroll does not appear!
Sorry the code is quite long, so I just pasted the essential parts here.
public class GUI_V3 extends JFrame {
//mainPanel into Frame
private JPanel mainPanel = new JPanel();
//clock component
private JTextField timeF = new JTextField(8);
//Button component
private Box btnBox = Box.createHorizontalBox();
private JButton button1 = new JButton("Add Keywords");
private JButton button2 = new JButton("Help");
//Top menu bar
private JPanel topPanel = new JPanel();
//Typing Area
private JTextField txtEnter = new JTextField();
//Typing Panel
private JPanel typingPanel = new JPanel();
//Chat Area
private JTextArea txtChat = new JTextArea();
private JPanel chatPanel = new JPanel();
//Scroll
private JScrollPane scroll = new JScrollPane(txtChat);
private String name;
private Conversation_V3 convo = new Conversation_V3();
public GUI_V3(){
//Frame attributes
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(1000,1000);
this.setVisible(true);
//this.setResizable(false);
this.setLocationRelativeTo(null);
this.setTitle("Welcome to Haidilao");
//clock attributes
timeF.setEditable(false);
timeF.setFont(new Font("Arial",Font.BOLD,48));
timeF.setBackground(new Color(228,224,199));
timeF.setHorizontalAlignment(SwingConstants.RIGHT);
//button attributes
button1.setFont(new Font("Arial",Font.PLAIN,38));
button2.setFont(new Font("Arial",Font.PLAIN,38));
btnBox.add(button1);
btnBox.add(Box.createRigidArea(new Dimension(10,70)));
btnBox.add(button2);
//Add ActionListener to buttons
Button1Handler handlerB1 = new Button1Handler();
button1.addActionListener(handlerB1);
Button2Handler handlerB2 = new Button2Handler();
button2.addActionListener(handlerB2);
//Top menu bar
topPanel.setLayout(new BorderLayout());
topPanel.add(btnBox, BorderLayout.WEST);
topPanel.add(timeF, BorderLayout.EAST);
topPanel.setBackground(new Color(228,224,199));
//Typing Area Attribute
txtEnter.setFont(new Font("DejaVu Sans",Font.PLAIN,30));
typingPanel.setBorder(BorderFactory.createEmptyBorder(10,20,10,20));
typingPanel.setLayout(new BorderLayout());
typingPanel.setBackground(new Color(228,224,199));
typingPanel.add(txtEnter);
//Add action listener for typing area
TypingHandler handlerT = new TypingHandler();
txtEnter.addActionListener(handlerT);
//Chat Area Attribute
txtChat.setEditable(false);
txtChat.setFont(new Font("DejaVu Sans",Font.PLAIN,30));
txtChat.setLineWrap(true);
txtChat.setWrapStyleWord(true);
chatPanel.setBorder(BorderFactory.createEmptyBorder(5,20,10,20));
chatPanel.setLayout(new BorderLayout());
chatPanel.setBackground(new Color(228,224,199));
chatPanel.add(txtChat, BorderLayout.CENTER);
chatPanel.add(scroll, BorderLayout.EAST);
scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
//mainPanel Layout
mainPanel.setLayout(new BorderLayout());
mainPanel.add(topPanel, BorderLayout.NORTH);
mainPanel.add(typingPanel, BorderLayout.SOUTH);
mainPanel.add(chatPanel, BorderLayout.CENTER);
//Add components to the JFrame
this.add(mainPanel);
//Add actionListener to clock
ClockHandler handlerC = new ClockHandler();
Timer t = new Timer(500, handlerC);
t.start();
//display greetings and ask for name
name = greetings();
addText(botSays("Welcome! " + name + ", you can ask me anything about the menu by providing keywords."));
}
//Action handler for txtEnter
private class TypingHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
//grab input
String input = txtEnter.getText();
//add to chat area
txtChat.append(name + ": " + input + "\n");
//set input field to empty
txtEnter.setText("");
SoundEffect.music();
convo.setInput(input);
addText(botSays(convo.getReply()));
//set the chat area to bottom of scroll
txtChat.setCaretPosition(txtChat.getDocument().getLength());
}
}
Please find a working solution and tweak this as per your requirements.
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class TestFrame extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel contentPane;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
TestFrame frame = new TestFrame();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public TestFrame() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
setContentPane(contentPane);
contentPane.setLayout(new BorderLayout(0, 0));
JScrollPane scrollPane = new JScrollPane();
contentPane.add(scrollPane, BorderLayout.CENTER);
JTextArea textArea = new JTextArea();
scrollPane.setViewportView(textArea);
}
}
Hope this will be helpful. :-)
I'm making a GUI and having trouble with a JPanel.
First of all here is my JPanel:
public class ExperimentPanel extends JPanel{
private static File file1,file2=null;
private static DefaultListModel model = new DefaultListModel();
private static JList list = new JList(model);
private static JPanel mainpanel = new JPanel();
private static JPanel leftpanel = new JPanel();
private static JPanel rightpanel = new JPanel();
private static JPanel twoFiles = new SelectTwoFiles();
private static JPanel folderOrFile = new SelectFolderOrFile();
private static JPanel foldersOrFiles = new SelectTwoFoldersOrFiles();
public ExperimentPanel(int selectID){
this.setBorder(new EmptyBorder(10, 10, 10, 10));
if(selectID==Constants.SelectTwoFiles){
this.add(twoFiles, BorderLayout.NORTH);
}
else if(selectID==Constants.SelectFolderOrFile){
this.add(folderOrFile, BorderLayout.NORTH);
}
else if(selectID==Constants.SelectTwoFoldersOrFiles){
this.add(foldersOrFiles,BorderLayout.NORTH);
}
JButton remove =new JButton("Remove Method");
JButton add = new JButton("Add Method");
JButton save = new JButton("Save list");
JButton load = new JButton("Load list");
leftpanel.add(new JScrollPane(list));
Box listOptions = Box.createVerticalBox();
listOptions.add(add);
listOptions.add(remove);
listOptions.add(save);
listOptions.add(load);
rightpanel.add(listOptions);
Box mainBox = Box.createHorizontalBox();
mainBox.add(leftpanel);
mainBox.add(rightpanel);
//mainBox.add(leftleft);
this.add(mainBox, BorderLayout.CENTER);
//start jobs
JButton start = new JButton("Launch experiment");
this.add(start,BorderLayout.PAGE_END);
start.addActionListener(launch);
add.addActionListener(adding);
remove.addActionListener(delete);
}
public static ActionListener launch = new ActionListener(){
public void actionPerformed(ActionEvent event){
//check the files
if((file1==null)||(file2==null)){
JOptionPane.showMessageDialog(null,
"A graph file is missing",
"Wrong files",
JOptionPane.ERROR_MESSAGE);
}
//checks the list
}
};
public static ActionListener delete = new ActionListener() {
public void actionPerformed(ActionEvent event) {
ListSelectionModel selmodel = list.getSelectionModel();
int index = selmodel.getMinSelectionIndex();
if (index >= 0)
model.remove(index);
}
};
public static ActionListener adding = new ActionListener(){
public void actionPerformed(ActionEvent event){
JComboBox combo = new JComboBox();
final JPanel cards = new JPanel(new CardLayout());
JPanel form = new JPanel();
JPanel methode1 = new JPanel();
methode1.add(new JLabel("meth1"));
methode1.setBackground(Color.BLUE);
methode1.setName("meth1");
JPanel methode2 = new JPanel();
methode2.add(new JLabel("meth2"));
methode2.setBackground(Color.GREEN);
methode1.setName("meth2");
combo.addItem("meth1");
combo.addItem("meth2");
cards.add(methode1,"meth1");
cards.add(methode2,"meth2");
JPanel control = new JPanel();
combo.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JComboBox jcb = (JComboBox) e.getSource();
CardLayout cl = (CardLayout) cards.getLayout();
cl.show(cards, jcb.getSelectedItem().toString());
}
});
control.add(combo);
form.add(cards, BorderLayout.CENTER);
form.add(control, BorderLayout.SOUTH);
JOptionPane.showMessageDialog(null,form,"Select a method",JOptionPane.PLAIN_MESSAGE);
}
};
}
The problem is that if i create several instances of that panel they won't show like intended.
I tried creating 2 simple JFrames in my main with a new ExperimentPanel for each so the problem is not from the caller.
It works well with one JFrame calling one experiementPanel.
here is the display for one and 2 calls:
http://imgur.com/a/4DHJn
And how i call them:
JFrame test = new JFrame();
test.add(new ExperimentPanel(3));
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
test.setLocation(dim.width/3 - test.getWidth()/3, dim.height/3 - test.getHeight()/3);
test.setSize(550,300);
test.setVisible(true);
JFrame test2 = new JFrame();
test2.add(new ExperimentPanel(3));
test2.setLocation(dim.width/3 - test.getWidth()/3, dim.height/3 - test.getHeight()/3);
test2.setSize(550,300);
test2.setVisible(true);
You create a Panel class ExperimentPanel which itself consists of several components which are stored in class fields of ExperimentPanel.
Since you declare these class fields as static there is only one instance of them. When you instantiate several ExperimentPanel objects they all want to share these fields, which leads to the effects you have seen.
Therefore remove the static modifier from these fields:
public class ExperimentPanel extends JPanel{
private File file1,file2=null;
private DefaultListModel model = new DefaultListModel();
private JList list = new JList(model);
private JPanel mainpanel = new JPanel();
private JPanel leftpanel = new JPanel();
...
I've tried different methods to fix this, but apparently nothing works. Because I am new to java I actually don't know if there's something wrong with my code.
I've tried setting the size of the text area that is supposed to go into the SOUTH part of the border layout, but the size is still to small to see.
Anyone know of a solution?
package package1;
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class SimpleDatabasePanel extends JFrame implements ActionListener {
private JMenuBar menuBar;
private JMenu file;
private JMenuItem save, load, quit;
private JButton add, undo, find, delete, display;
private JScrollPane pane;
private JTable table;
private JPanel panel;
private JTextArea tName, tGNum, tGPA, results;
private JLabel name, gNum, gpa;
private LinkedList list;
public SimpleDatabasePanel(){
setLayout(new BorderLayout());
setTitle("Simple Database");
//setSize(1000,1000);
menuBar = new JMenuBar();
setJMenuBar(menuBar);
file = new JMenu("File");
quit = new JMenuItem("Quit");
save = new JMenuItem("Save");
load = new JMenuItem("Load");
add = new JButton("Add");
undo = new JButton("Undo");
find = new JButton("Find");
delete = new JButton("Delete");
display = new JButton("Display");
tName = new JTextArea();
tGNum = new JTextArea();
tGPA = new JTextArea();
results = new JTextArea(10,20);
name = new JLabel("Name");
gNum = new JLabel("G Number");
gpa = new JLabel("GPA");
list = new LinkedList();
panel = new JPanel();
panel.setLayout(new GridLayout(3, 4, 4, 4));
//frame = new JFrame();
pane = new JScrollPane();
pane.setSize(300, 60);
table = new JTable();
menuBar = new JMenuBar();
menuBar.add(file);
file.add(save);
file.add(load);
file.add(quit);
panel.add(name);
panel.add(tName);
panel.add(undo);
panel.add(add);
panel.add(gNum);
panel.add(tGNum);
panel.add(find);
panel.add(delete);
panel.add(gpa);
panel.add(tGPA);
panel.add(display);
pane.add(results);
add(menuBar, BorderLayout.NORTH);
add(panel, BorderLayout.CENTER);
add(pane, BorderLayout.SOUTH);
this.pack();
ButtonListener listener = new ButtonListener();
file.addActionListener(file.getAction());
find.addActionListener(listener);
undo.addActionListener(listener);
save.addActionListener(this);
quit.addActionListener(this);
add.addActionListener(listener);
load.addActionListener(this);
delete.addActionListener(listener);
display.addActionListener(listener);
}
public void actionPerformed(ActionEvent e) {
JMenuItem file = (JMenuItem) e.getSource();
if(file == quit){
System.exit(0);
}
if(file == load){
String filename = JOptionPane.showInputDialog("Enter File Name: ");
(list).load(filename);
}
if(file == save){
String filename = JOptionPane.showInputDialog("Enter File Name: ");
(list).save(filename);
}
}
private class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent event) {
if(event.getSource() == add){
}
if(event.getSource() == delete){
}
if(event.getSource() == display){
}
if(event.getSource() == find){
}
if(event.getSource() == undo){
}
}
}
public static void main(String[] args){
SimpleDatabasePanel s =new SimpleDatabasePanel();
s.setVisible(true);
s.setResizable(false);
}
}
change this
pane.add(results);
to this
pane.setViewportView(results);
or this
pane.getViewport().add(results, null);
use setViewportView or getViewport().add to set component to jscrollpane.also you can pass component (jtextarea ) to constructor of jscrollpane.read more about jscrollpane here
output
this is my first time here.
I was writing a GUI-driven program which would allow me to perform Caesar's cipher on .txt files.
However, before I could add the ActionListeners and ChangeListeners I decided to test the GUI. Here is what I got:
Here is the code:
package implementation;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class Frame extends JFrame{
public Frame(){
super("Caesar[E]");
this.setVisible(true);
this.setLocationRelativeTo(null);
/*Adding the options to GUI*/
factor.setPreferredSize(new Dimension(30,30));
JToolBar toolbar = new JToolBar();
radio.add(encrypt);
radio.add(decrypt);
toolbar.add(encrypt);
toolbar.add(decrypt);
toolbar.add(factor);
toolbar.setFloatable(false);
/*Adding the JTextArea for input*/
Box inputBound = Box.createHorizontalBox();
Box inputBound_text = Box.createVerticalBox();
Box inputBound_buttons = Box.createVerticalBox();
inputScroll.add(input);
inputScroll.setEnabled(true);
input.setEditable(true);
inputScroll.setBorder(BorderFactory.createTitledBorder("Text/File for Encryption/" +
"Decryption"));
inputBound_text.add(inputScroll);
inputBound_buttons.add(openFile);
inputBound_buttons.add(cancelFileInput);
inputBound.add(inputBound_text);
inputBound.add(Box.createHorizontalStrut(25));
inputBound.add(inputBound_buttons);
/*Adding JTextArea for output*/
Box outputBound = Box.createHorizontalBox();
Box outputBound_text = Box.createVerticalBox();
Box outputBound_buttons = Box.createVerticalBox();
outputScroll.add(output);
output.setEditable(true);
outputScroll.setBorder(BorderFactory.createTitledBorder("Text After Encryption" +
"/Decryption"));
outputBound_text.add(outputScroll);
outputBound_buttons.add(saveFile);
outputBound_buttons.add(send);
outputBound.add(outputBound_text);
outputBound.add(Box.createHorizontalStrut(25));
outputBound.add(outputBound_buttons);
outputBound.setSize(150, 200);
/*Adding JButton for performing the action*/
this.add(performAction,BorderLayout.SOUTH);
/*Adding the components to the Frame*/
Box outerBox = Box.createVerticalBox();
outerBox.add(toolbar,BorderLayout.NORTH);
outerBox.add(inputBound);
outerBox.add(outputBound);
this.add(outerBox);
this.setSize(500, 700);
}
boolean isFileInput = false;
boolean isEncrypt = true;
JButton performAction = new JButton("Encrypt!");
JButton openFile = new JButton("Open a File");
JButton cancelFileInput = new JButton("Cancel File Input");
JButton saveFile = new JButton("Save File");
JButton send = new JButton("Send");
JTextArea input = new JTextArea();
JTextArea output = new JTextArea();
JFileChooser chooser = new JFileChooser();
JScrollPane inputScroll = new JScrollPane();
JScrollPane outputScroll = new JScrollPane();
ButtonGroup radio = new ButtonGroup();
JRadioButton encrypt = new JRadioButton("Encrypt",true);
JRadioButton decrypt = new JRadioButton("Decrypt",false);
JSpinner factor = new JSpinner(new SpinnerNumberModel(1,1,26,1));
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
#Override
public void run(){
new Frame();
}
});
}
}
Can you please tell me how I can solve the problems as shown in the image?
I know I can use setPreferredSize() but how do I make sure that I enter the correct dimension without trial-and-error?
I like the SpringLayout, it is very flexible and there is very not a lot that it can't do. Especially you will not need to care about setPreferredSize anymore. Just search for it, there are enough resources out there.
SpringLayout allows you to define the size of elements relative to others - so for example, you can make sure the buttons will look the same.
I would recommend MiGLayout as LayoutManager. Things like that are easy in MiGLayout
Trial-and-error is never a good way to get the layout you want. Instead, use the JTextArea constructor that lets you say how many rows and columns you want.
JTextArea(int rows, int columns)
JTextArea will calculate a good preferred size for when you pack() the window, and you won't need setSize().
Edit: You said, "JTextArea is inactive. I can't enter text in it."
Instead of add(), use setViewportView():
inputScroll.setViewportView(input);
...
outputScroll.setViewportView(output);
...
In situations like these, I like to divide my application into areas of responsibility. This keeps the code clean and self contained, allowing me to replace sections of it if/and when required, without adversely effect the rest of the application.
It also means that you can focus on the individual requirements of each section.
With complex layout, it's always better (IMHO) to use compounding containers with separate layout managers, it reduces the complexity and potential for strange cross over behavior.
public class BadLayout07 {
public static void main(String[] args) {
new BadLayout07();
}
public BadLayout07() {
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 MasterPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class MasterPane extends JPanel {
public MasterPane() {
EncryptSettings encryptSettings = new EncryptSettings();
InputPane inputPane = new InputPane();
OutputPane outputPane = new OutputPane();
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
add(encryptSettings, gbc);
gbc.gridy++;
gbc.weighty = 1;
gbc.fill = gbc.BOTH;
add(inputPane, gbc);
gbc.gridy++;
add(outputPane, gbc);
}
}
public class EncryptSettings extends JPanel {
private JRadioButton encrypt;
private JRadioButton decrypt;
private JSpinner factor;
public EncryptSettings() {
encrypt = new JRadioButton("Encrypt");
decrypt = new JRadioButton("Decrypt");
ButtonGroup bg = new ButtonGroup();
bg.add(encrypt);
bg.add(decrypt);
factor = new JSpinner(new SpinnerNumberModel(new Integer(1), new Integer(1), null, new Integer(1)));
setLayout(new FlowLayout(FlowLayout.LEFT));
add(encrypt);
add(decrypt);
add(factor);
}
}
public class InputPane extends JPanel {
private JTextArea input;
private JButton open;
private JButton close;
public InputPane() {
setBorder(new TitledBorder("Source Text"));
input = new JTextArea();
open = new JButton("Open");
close = new JButton("Close");
JPanel tb = new JPanel(new FlowLayout(FlowLayout.LEFT));
tb.add(open);
tb.add(close);
setLayout(new BorderLayout());
add(tb, BorderLayout.NORTH);
add(new JScrollPane(input));
}
}
public class OutputPane extends JPanel {
private JTextArea output;
private JButton save;
private JButton send;
public OutputPane() {
setBorder(new TitledBorder("Encrypted Text"));
output = new JTextArea();
output.setEditable(false);
save = new JButton("Save");
send = new JButton("Send");
JPanel tb = new JPanel(new FlowLayout(FlowLayout.LEFT));
tb.add(save);
tb.add(send);
setLayout(new BorderLayout());
add(tb, BorderLayout.NORTH);
add(new JScrollPane(output));
}
}
}
I've not interconnect any of the functionality, but it is a simple case of providing appropriate setters and getters as required, as well appropriate event listeners.
hi I'm basically give up. Ok so this is what I am trying to do. So far I have written code to create a JFrame which contains a text field and combo box. The code is supposed to calculate the area of an input in the text field depending on what shape is selected from the combo box and output the result on the JFrame!
Here's is what the output should look like
And here is my code so far. it's a bit messed up but any help would be much appreciated. Thanks in advance
import javax.swing. *;
import java.awt.event. *;
import java.awt.FlowLayout;
import java.lang.Math;
public class AreaFrame3 extends JFrame
{
double Area;
double input;
public static void main(String[]args)
{
//Create array containing shapes
String[] shapes ={"(no shape selected)","Circle","Equilateral Triangle","Square"};
//Use combobox to create drop down menu
JComboBox comboBox=new JComboBox(shapes);
JLabel label1 = new JLabel("Select shape:");
JPanel panel1 = new JPanel(new FlowLayout()); //set frame layout
JLabel label2 = new JLabel("(select shape first)");
JTextField text = new JTextField(10); //create text field
text.setEnabled(false);
panel1.add(label1);
panel1.add(comboBox);
panel1.add(label2);
panel1.add(text);
JFrame frame=new JFrame("Area Calculator Window");//create a JFrame to put combobox
frame.setLayout(new FlowLayout()); //set layout
frame.add(panel1);
frame.add(text);
//JButton button = new JButton("GO"); //create GO button
//frame.add(button);
//set default close operation for JFrame
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
//set JFrame ssize
frame.setSize(400,250);
//make JFrame visible. So we can see it
frame.setVisible(true);
// public void actionPerformed(ActionEvent e)
//{
}
public void AreaCalc()
{
JButton button = new JButton("GO"); //create GO button
frame.add(button);
button.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e)
{
int input = double.parseDouble(text.getText());
if(e.getSource() == button)
{
String shape = (String).comboBox.getSelectedItem();
if(shape == "(no shape selected)")
{
text.setEnabled(false);
}
else{
text.setEnabled(true);
}
if(input > 1 && shape == "Circle")
{
// label2.getText() = "Enter the radius of the circle: ";
Area = (Math.PI * (input * input));
}
}
else{}
}
}
);
}
}
I try to understand what you did here:
panel1.add(label1);
panel1.add(comboBox);
panel1.add(label2);
panel1.add(text); // <---
JFrame frame=new JFrame("Area Calculator Window");//create a JFrame to put combobox
frame.setLayout(new FlowLayout()); //set layout
frame.add(panel1);
frame.add(text); // <---
Especially frame.add(text); and panel1.add(text);. Don't add text to JFrame. Use JPanel.
Further,
public class AreaFrame3 extends Frame
Use public class AreaFrame3 extends JFrame so you don't need create additional JFrame:
JFrame frame=new JFrame("Area Calculator Window");
Something like:
super.setLayout(new FlowLayout()); //set layout
super.add(panel1);
super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
super.pack();
//set JFrame ssize
super.setSize(400,250);
//make JFrame visible. So we can see it
super.setVisible(true);
At last Ill give you some tamplate to start with (that will help you):
public class FrameExmpl extends JFrame{
private static final long serialVersionUID = 1L;
private JTabbedPane tabbedPane;
private JPanel topPanel;
private JTextField txtf_loadDS_;
public static int valueInt = 0; // responsible for Task status updating
public static Boolean isFinish = false;
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException{
UIManager.setLookAndFeel( "com.sun.java.swing.plaf.windows.WindowsLookAndFeel" );
FrameExmpl UI_L = new FrameExmpl();
UI_L.buildGUI();
UI_L.setVisible(true);
}
public void buildGUI(){
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
dispose();
}
});
setSize(435, 225);
setLocation(285, 105);
setResizable(false);
topPanel = new JPanel();
topPanel.setLayout(new BorderLayout());
getContentPane().add(topPanel);
txtf_loadDS_ = new JTextField();
txtf_loadDS_.setBounds(22, 22, 382, 25);
topPanel.add(txtf_loadDS_);
finishBuildGUI();
}
public void finishBuildGUI(){
tabbedPane = new JTabbedPane();
topPanel.add(tabbedPane, BorderLayout.CENTER);
}
}
There are multiple issues with this application such as extending from Frame rather than JFrame & attempting to assign an int from Double.parseDouble. I would recommend that you start again building a small but working application and incrementally add functionality, this way errors are easier to fix.