how to get value from 1stFrame to 2ndFrame?

[zacix]

Im am new to Java and netbeans. need help.

In my "First" frame:
I accept textfield (e.g. name) from user, then user click button OK.
then jump to Second form, I want to display name in my Second frame jlabel,
how can I do it?

Following are my code in First Frame and User.java

---------------------------------------------------------------------------------
//First frame
public static User x;
private void btn_nextActionPerformed(java.awt.event.ActionEvent evt) {
String a = name.getText();
x = new User(a) //store name into User class

Second frame2 = new Second(); //open Second frame
this.setVisible(false);
frame2.setVisible(true);

---------------------------------------------------------------------------------
//User class

public class User{

private String name;

public User(String a){
name = a;
}
}
----------------------------------------------------------------------------------

[bolsover]

I suggest you implement PropertyChangeListener in frame2 and fire PropertyChangeEvent from frame1

[Bayless Kirtley]

You're making it a bit harder than needed. Let Netbeans create your second
frame then manually add a new constructor to it that accepts your name. Then
instantiate your second frame passing the name as the constructor argument,

Second frane2 = new Second(a);

That is one simple way.


-----Original Message-----
From: zacix
Sent: Wednesday, June 20, 2012 5:00 AM
To: address-removed
Subject: [nbusers] how to get value from 1stFrame to 2ndFrame?

Im am new to Java and netbeans. need help.

In my "First" frame:
I accept textfield (e.g. name) from user, then user click button OK.
then jump to Second form, I want to display name in my Second frame jlabel,
how can I do it?

Following are my code in First Frame and User.java

---------------------------------------------------------------------------------
//First frame
public static User x;
private void btn_nextActionPerformed(java.awt.event.ActionEvent evt) {
String a = name.getText();
x = new User(a) //store name into User class

Second frame2 = new Second(); //open Second frame
this.setVisible(false);
frame2.setVisible(true);

---------------------------------------------------------------------------------
//User class

public class User{

private String name;

public User(String a){
name = a;
}
}
----------------------------------------------------------------------------------






-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.2180 / Virus Database: 2437/5081 - Release Date: 06/20/12

[bolsover]

Yes indeed, passing the name value as a constructor argument is easier... but a less flexible solution - users often want to have both frames open and pass data between the two.

How about beansbinding as another alternative?

[zacix]

thx Bayless Kirtley.

bolsover, I do not know about beansbinding yet.


I want to create Java GUI Application by netbeans, do I need to create a "Main.java" class (no design interface) as Main Class?

how can I get input value from JFrame form (e.g. First.java), and pass into Main.class for further data manipulation?

[SearchEngine27]

As mentioned before, whether you're just trying to get a value from one window, close it, and then open up a second video with that information, then all you really have to do is create a listener.

for closing the first window and then opening a second with that information, you would set an action listener on whatever it is you're using to close the first window
i.e.

[bolsover]

zacix

As you will gather, there are several ways to solve the problem of passing data from one frame to another; none of the solutions discussed is 'right' - they each have their own merits. Which you choose depends on what you need to achieve.

Passing the name as a parameter as suggested by Bayless is just fine if you don't need to have frame2 updated again after it is first displayed. If you do need further updates to frame2 (such as typing into a textBox in frame1 and having the data also appear in frame2) then the technique I described is probably more apporpriate.

to give you an idea how easy this is...
I just created two JFrame: Frame1 and Frame2

I added a JButton and JTextField to Frame1 and a JTextField to Frame2
I then added an ActionListener to JButton and KeyListener to JTextField in Frame1.
Finally, I implemented PropertyChangeListener in Frame2 with the appropriate propertyChange(PropertyChangeEvent evt) method.
The action method bodies are detailed in the code below.


Frame1