jlabel.setText, event from another class does not

can someone help me this code?

import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import java.awt.event.*;
import javax.swing.JLabel;
import javax.swing.JTabbedPane;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class Frame1 extends JFrame{
    private JFrame m2;
    private JButton btn;
    private JTabbedPane tab;
    public Frame1(){
        setTitle("Frame1");
        setLayout(new java.awt.BorderLayout());
  
        tab = new JTabbedPane();
        tab.addTab("Tab1",new JLabel("Tab1"));
        tab.addTab("Tab2",new JLabel("Tab2"));
        tab.addTab("Tab3",new JLabel("Tab3"));
        add(tab,BorderLayout.CENTER);
        tab.addChangeListener(new ChangeListener(){
                public void stateChanged(ChangeEvent evt){
                    int currtab = tab.getSelectedIndex();
                    System.out.println("Frame1: "+currtab); //<- it works
                   new myPanel(currtab); 
                    //new myPanel(new JLabel(),currtab);
                }
        });
        
        m2 = new Frame2(); 
        m2.setBounds(300,20,400,300);
        
     btn = new JButton("Show Frame2");
     add(btn,BorderLayout.SOUTH);
      btn.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent e){
       m2.setVisible(true);
      }
      }
     ); 
       
      setVisible(true);
      setBounds(250,10,500,400);
      setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
    public static void main(String[]args){
        new Frame1();
    }
}

------------------------------------------------------------------------------------------------------------

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Frame2 extends JFrame{
    private JPanel pan;
    public Frame2(){
        setAlwaysOnTop(true);
        setLayout(new java.awt.BorderLayout());
        pan = new myPanel();
        add(pan,BorderLayout.CENTER); 
    }
}

---------------------------------------------------------------------------------------------------

import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class myPanel extends JPanel{
    private JLabel label = new JLabel("Test jLabel changed");
  //private JLabel label;  //<- not working
    /*
     * this constructor still not working
    public myPanel(JLabel l,int i){
        label = l;
        System.out.println("myPanel: "+i);
        //label = new JLabel(""+i); //<- not working
        label.setText(String.valueOf(i)); //<- not working
    }
     */
   public myPanel(int i){
        System.out.println("myPanel: "+i);
        //label = new JLabel(""+i); //<- not working
        label.setText(String.valueOf(i)); //<- not working
    }
        
    public myPanel(){
       setBackground(Color.ORANGE);
       setLayout(new java.awt.BorderLayout());
       add(label,BorderLayout.NORTH);
    }
}

Im trying to update the label text using myPanel.java label.setText using stateChanged tabPane in Frame1.java

Published by: jhovarie on August 18, 2011 21:56

Published by: jhovarie on August 19, 2011 06:50

Published by: jhovarie on August 19, 2011 23:19

"First of all, use the formatting code"
I don't know where he is.

Already answered - in a much more civil way I wish!

and also I already explain what im trying to do maybe didn't it read the comments in my code and the bellows of my last code message. I have already explained my problem.

I did not read your comments either, because the code was not formatted (hard to read =). And because nothing in the text of the proposed non-code that there comments in code that has highlighted the problem.

Im trying to update the label text using myPanel.java label.setText using stateChanged tabPane in Frame1.java
look at my code earlier there is a code like that (...)

The code you cite here is irrelevant. The problem is in the event listener:

public void stateChanged(ChangeEvent evt){
  int currtab = tab.getSelectedIndex();
  System.out.println("Frame1: "+currtab); //<- it works
  new myPanel(currtab);
  //new myPanel(new JLabel(),currtab);
}

So whenever you change your tab, you create an instance of myPanel, that is strange in itself; but worse yet, what are you doing with the newly created group? You don't add it anywhere. What then is this instance?
The code proposes label.setText (...) is in the constructor of mypanel, but it changes the text of the new label in the new Panel, not existing the existing label in the Panel text.

Tags: Java

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