Jtextfield display problem

joanoa

Please help me see the following code When the number of TEXT in the time of the time, the number in the text is not changed.
Will it be a problem with a scope? If so, how should it be changed to change after the point is determined? Thank you!
Import javax.swing. *;
Import java.awt. *;
Import java.awt.event. *;
Public Class Text Extends Jframe Implements ActionListener
{JBUTTON TB = New JButton ("Start");
INT A = 0;
    Jtextfield text = new jtextfield (", 10);
Jtextfield text1 = new jtextfield ("5", 10);
Text ()
{
Super (Text Test ");
Setsize (100, 150);
SetLocation (200, 300);
GetContentPane (). setLayout (New flowLayout ());
GetContentPane (). add (text);
GetContentPane (). add (tb);
getContentPane (). Add (text1);
Tb.addActionListener (this);
Pack ();
SetDefaultCloseOperation (jframe.exit_on_close);
SetVisible (TRUE);
Begin ();
}
Public void begin ()
{
INT i = 0;
       A = integer.parseint (Text1.getText (). Trim ());
While (a> 0)
{
A -; i = 50;
While (i> 0)
{
I-;
System.out.print ("+ i);
Text.setText ("+ i);
Try {
Thread.sleep (50);
     } catch (Exception E)
{}
}
}
}
Public Void ActionPerformed (ActionEvent EE)
{
IF (EE.GETSOURCE () == TB)
{begin ();

       }
  Public static void main (String SRGS [])
  {new text ();
  }
}

sindbad

The second is a thread blocking problem. You stop the main thread, so you can't show it. In order to make you have a lot of changes, I use this method to modify:
Import javax.swing. *;
Import java.awt. *;
Import java.awt.event. *;

Public class text extends JFrame IMPLEments ActionListener, runnable {// adds a thread interface.
  JButton TB = New JButton ("Start");
  INT A = 0;
  Jtextfield text = new jtextfield (", 10);
  Jtextfield text1 = new jtextfield ("5", 10);
  // Thread TH = New Thread (this);
  TEXT () {
    Super (Text Test ");
    Setsize (100, 150);
    SETLOCATION (200, 300);
    GetContentPane (). setLayout (New flowLayout ());
    GetContentPane (). add (text);
    GetContentPane (). add (tb);
    getContentPane (). Add (text1);
    Tb.addActionListener (this);
    Pack ();
    SetDefaultCloseOperation (jframe.exit_on_close);
    SetVisible (TRUE);
    TEXT.SETENABLED (FALSE);
    Run (); // ------------------> It is equivalent to executing your Begin method.
  }

  Public void run () {// -------> BeGin is changed to RUN, which is for overload.
    INT i = 0;
    A = integer.parseint (Text1.getText (). Trim ());
    While (a> 0) {
      A-;
      i = 50;
      While (i> 0) {
        I-;
        System.out.print ("+ i);
        Text.setText ("+ i);
        Try {
          Thread.sleep (50);
        }
        Catch (Exception E) {}
      }
    }
  }

  Public Void ActionPerformed (ActionEvent EE) {

     New thread (this) .start (); // ---> Mainly here, create new threads, this will not affect the main thread


  }

  Public static void main (String SRGS []) {
    NEW text ();
  }
}

sindbad

The error should be aware that you don't jump like your button, indicating that it is the main thread.

joanoa

Thank you, I will then change it later. I don't understand what it means?

asr

sindbad 2021-4-23 11:00
The error should be aware that you don't jump like your button, indicating that it is the main threa ...

ok thanks

zltwork

Thank you, thank you, I will also change it later.