Using strings within different classes...help!!!!!!!

Question

Plz tell me how i can access a string that is defined in a another class.For example I have a string defined in a class i need to access it in a another class .The dot operator doesnt work unless the class in which string is defined is instantiated in the class where i need to access it.How do i do it then? .Iam not able to write a method to access the string (Smebody in the forum had suggested writing a method).Plz help me out?.The string is entered as user input during runtime .

Answer 1

I should correct myself. Please post code that will also run as a program on our boxes. Also, in your current code Clicka doesn't have a Click object anywhere.
One problem I see is in your first program Click is acting as an ActionListener, and your input string will only become available after the ActionListener has fired. So any program that wants the input String had better only request it after the listener has fired, has had its actionPerformed method called. So in this situation, how do you notify any interested programs that this has happened? One way is to use the observer pattern. This can be simply applied using a ChangeListener like so:
Click.java
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JOptionPane;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class Click implements ActionListener
  private String input = "";
  List<ChangeListener> changeListeners = new ArrayList<ChangeListener>();
  public void actionPerformed(ActionEvent event)
    input = JOptionPane
        .showInputDialog("Enter the location of hex file (example C://new.txt");
    JOptionPane.showMessageDialog(null, "You have selected " + input);
    ChangeEvent e = new ChangeEvent(this);
    for (ChangeListener cl : changeListeners)
      cl.stateChanged(e);
  public void addChangeListener(ChangeListener cl)
    changeListeners.add(cl);
  public String getInput()
    return input;
}UseClick.java
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class UseClick
  private JPanel mainPanel = new JPanel();
  private Click click;
  private JTextField textField = new JTextField(15);
  public UseClick()
    click = new Click();
    click.addChangeListener(new ChangeListener()
      public void stateChanged(ChangeEvent e)
        String input = click.getInput();
        textField.setText(input);
    JButton clickBtn = new JButton("Click");
    clickBtn.addActionListener(click);
    textField.setEditable(false);
    mainPanel.add(clickBtn);
    mainPanel.add(textField);
  public JPanel getMainPanel()
    return mainPanel;
  private static void createAndShowUI()
    JFrame frame = new JFrame("UseClick");
    frame.getContentPane().add(new UseClick().getMainPanel());
    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();
}