Can't set values in swing components in another class
I have this class for my UI
public class MyFrame extends JFrame{
JTextArea textArea;
public MyFrame(){
setSize(100,100);
textArea = new JTextArea(50,50);
Container content = getContentPane();
content.add(textArea);
}
public static void main(String[] args){
JFrame frame = new MyFrame();
frame.show();
UpdateText u = new UpdateText();
u.settext("Helloworld");
}
}
And I have this other class that will set the text textArea
in which I have expanded MyFrame to acces textArea in another class.
public class UpdateText extends MyFrame{
public void settext(String msg){
textArea.setText(msg);
}
}
Then I create UpdateText and call the settext function. but the text doesn't seem to show up in the GUI. please, help
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First of all, don't override a method setText()
unless you want different behavior. Second, you have nothing to expand. All you have to do is follow these simple steps and you will be set!
-
In the class,
UpdateText
put these lines somewhere in it:MyFrame gui; public UpdateText(MyFrame in) { gui = in; }
-
In the "MyFrame" class, put this line at the beginning:
UpdateText ut = new UpdateText(this);
You can now refer to everything in the class MyFrame
from within the class UpdateText
, navigating to what you want to change with gui
. For example, say that you want to change the text of your text box. The code will look like this:
gui.textArea.setText("Works!");
Happy coding! :)
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