I have to get a String input in one JFrame and display in another. My second task is to flash the given string in a larger font in the second frame, at an interval of 1sec. How to proceed?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Input{
String hinput;
private JFrame mainFrame;
private JLabel headerLabel;
private JLabel statusLabel;
private JPanel controlPanel;
private void prepareGUI(){
mainFrame = new JFrame("STRING");
mainFrame.setSize(500,100);
headerLabel = new JLabel("", JLabel.CENTER);
controlPanel = new JPanel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.setVisible(true);
}
private void showTextField(){
JLabel stringlabel= new JLabel("String ", JLabel.RIGHT);
final JTextField userText = new JTextField(20);
JButton submitButton = new JButton("Submit");
submitButton.addActionListener(new mylistener());
submitButton.setActionCommand("open");
controlPanel.add(stringlabel);
controlPanel.add(userText);
controlPanel.add(submitButton);
mainFrame.setVisible(true);
}
private class mylistener implements ActionListener{
public void actionPerformed(ActionEvent e){
String cmd = e.getActionCommand();
if(cmd.equals("open")){
mainFrame.dispose();
NewJFrame nj= new NewJFrame(hinput);
}
}
}
public static void main(String args[]){
Input Inp = new Input();
Inp.prepareGUI();
Inp.showTextField();
}
}
class NewJFrame{
JFrame mainFrame;
String text;
JLabel l1;
JTextField tb1;
public NewJFrame(String t){
text=t;
mainFrame=new JFrame("STRING");
mainFrame.setSize(800,800);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
l1=new JLabel("Entered string");
tb1.setText(text);
mainFrame.add(l1);
mainFrame.add(tb1);
mainFrame.setVisible(true);
}
}
I am getting traceback after i click ‘submit’ button. Please point out the errors.
Answer
You can get rid of the error by instatiating tb1 in your NewJFrame class like so:
class NewJFrame{
JFrame mainFrame;
String text;
JLabel l1;
JTextField tb1;
public NewJFrame(String t){
text=t;
mainFrame=new JFrame("STRING");
mainFrame.setSize(800,800);
// *** must init tb1!!! ***///
JTextField tb1 = new JTextField();
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
l1=new JLabel("Entered string");
tb1.setText(text);
mainFrame.add(l1);
mainFrame.add(tb1);
mainFrame.setVisible(true);
}
}
As for getting text typed in one JFrame to open in another, I have a slightly modified solution. Maybe have text entered in a JTextField on one JPanel display in another JPanel. To do that, you could use the following code:
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.JLabel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.FlowLayout;
public class SimpleGUI extends JFrame {
private final JPanel firstPanel;
private final JPanel secondPanel;
private final JButton submitButton;
private final JTextField textField;
private final JLabel secondPanelLabel;
public SimpleGUI() {
// sets the title of the JFrame
super("SimpleGUI");
setLayout(new FlowLayout());
// inits both JPanels
firstPanel = new JPanel();
secondPanel = new JPanel();
// inits empty second JLabel and adds to the secondPanel
secondPanelLabel = new JLabel();
secondPanel.add(secondPanelLabel);
// makes the secondPanel invisible for the time being
secondPanel.setVisible(false);
// inits the submit button
submitButton = new JButton("Submit");
// event-handler for submit button, will set the text in the
// secondPanelLabel to the text in the JTextField the user types
// into. It then makes the firstPanel (with the text field and button),
// invisible, and then makes the second panel visible.
submitButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
secondPanelLabel.setText(textField.getText());
firstPanel.setVisible(false);
secondPanel.setVisible(true);
}
});
// inits the textField
textField = new JTextField(10);
// adds the button and the text field to the firstPanel
firstPanel.add(submitButton);
firstPanel.add(textField);
// adds both panels to this JFrame
this.add(firstPanel);
this.add(secondPanel);
}
}
And here is a class with a main method that constructs the SimpleGUI so you can test it out for yourself:
import javax.swing.JFrame;
public class SimpleGUITest {
public static void main(String[] args) {
SimpleGUI frame = new SimpleGUI();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500, 500);
frame.setVisible(true);
}
}