Conditional "updates" to a method...?

Well, I am just learning Java... My goal is to learn enough java to convert server of the pattern (in fact dtksh) scripts. My first experience is an example of code of "gui" of "head first Java - Sierra/Bates. The code of the book works fine, but in order to understand how 'classes', 'methods' and 'Listeners' work, I tried to add a Boolean logic for the button.

The code displays a simple graphical user interface that draws a filled in circle in the central region. Pressing any key causes the circle is redesigned with new colors (random). The second button changes the label text in the Western region. What I want to do is to update the label in the Western region based on the value of the variable 'msg '.

Because I don't really understand the components, I don't know which code to include, why I included it all the!

I commented parts I added do not have ' work. In fact, mine works... but not as I want.

Goal: If 'msg' = 'true', and then change the text of the label of 'REAL' value 'false '.
If 'msg' = 'false' then change the text of the label of 'FALSE' and the value of msg to ' true
(Sofare so good... If I change my 'msg' is true or false... it works right exacltly).

What it does not change the value so the next time the button is pressed, it should be the opposite. Sense repeatidly clicking the button should change the text of Labé of ti true false and false to true.

Here's the full text... Sorry if this is too long!

Thank you

Kevin

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Vector.*;
public class TestGui2 {
     JFrame frame;
     JLabel label;
     boolean msg = false;  
public static void main (String[] args) {
     TestGui2 gui = new TestGui2();
     gui.go();
     }
public void go() {
     frame = new JFrame();
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     JButton labelButton = new JButton(“Change Label”);
     if (msg) {
          labelButton.addActionListener(new LabelListener()); 
          } else {
          labelButton.addActionListener2(new LabelListener2());
          }
JButton colorButton = new JButton(“Change Circle”);
     colorButton.addActionListener(new ColorListener());
     label new JLabel(“I’m a label”);
     MyDrawPanel drawPanel = new MyDrawPanel();
     frame.getContentPane().add(BorderLayout.SOUTH, colorButton);
     frame.getContentPane().add(BorderLayout.CENTER, drawPanel);
     frame.getContentPane().add(BorderLayout.EAST, labelButton);
     frame.getContentPane().add(BorderLayout.WEST, label);
     frame.setSize(500,300);
     frame.setVisible(true);
     }
class LabelListener implements ActionListener {
     public void actionPerformed(ActionEvent event) {
          label.setText(“TRUE!”);
          msg = false;
          }
     }

class LabelListener2 implements ActionListener {
     public void actionPerformed(ActionEvent event) {
          label.setText(“FALSE!”);
          msg = true;
          }
     }
class ColorListener implements ActionListerner {
     Public void actionPerformed(ActionEvent event) {
     Frame.repaint();
          }
     }
}

Published by: leonhardtk on June 30, 2011 11:22

Because it is not formatting properly, I have surround my suspicious code in asterisks.

Thank you.

Good. You have two separate listeners, but in the initialization of your treatment, you choose one of them and use it forever afterwards. The solution to this is to have only one earphone. And this listener must have a conditional logic that decides what text in the label, based on the State of the program at this time.

Tags: Java

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Well, there is always a way to prevent the operation of update at the level of the entities.
In the entity class that corresponds to table B, you can do the following:
```
    protected void doDML(int operation, TransactionEvent e) {
       if (operation != DML_UPDATE)
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    }
```
Of course, you can examine the additional conditions, for example (in pseudocode):
```
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Under certain conditions, update a table based on the comparison with a SQL statement
I have a table (table 1) that has 4 columns:

UID. THE NEST | VALUE1 | VALUE2

I have another statement SQL (STMT) that returns the 3 columns of a few other tables:

UID. THE NEST | VALUE1

Now this is the condition of the way in which I want to put up-to-date TABLE1:

First, to compare a pair of UID and PID of STMT with those in TABLE1,

-1, for any new pair UID and PID not in TABLE1, insert a new line of STMT in TABLE1 set TABLE1. Value2 = 0 (I already did this).

2, for an existing UID and PID pair in STMT and TABLE1, do:

a. in TABLE1. Value2 > 0, update TABLE1. VALUE1 = STMT. VALUE1

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Here's one way:
```
MERGE INTO  table1  dst
USING          (
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SET           dst.value1 = CASE
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                    OR     (   dst.value2 = 0
                         AND dst.calue1 != src.value1
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WHERE   dst.value2 > 0
OR (    dst.value2 = 0
   AND  dst.calue1 != src.value1
   )
;
```
This assumes that the combination (uid, pid) is unique in stmt. It doesn't have to be unique in table1.

sb92075 wrote:

-1, for any new pair UID and PID not in TABLE1, insert a new line of STMT in TABLE1 set TABLE1. Value2 = 0 (I already did this).

FUSION could also do parts 1 and 2 together, in the same statement.

2, for an existing UID and PID pair in STMT and TABLE1, do:

a. in TABLE1. Value2 > 0, update TABLE1. VALUE1 = STMT. VALUE1

b. to TABLE1. Value2 = 0 and if TABLE1. VALUE1! = STMT. Value1, update of TABLE1. VALUE1 = STMT. Value1, otherwise nothing to do.

Why are they not simply your needs ' uid and pid that already exist in stmt and table1, if table1.value2 > = 0, then the value table1.value1 = stmt.value1 "? Are you concerned about shooting triggers unnecessarily? It has something to do with null values? The MERGE statement above does exactly what you asked, but, depending on your needs, something simpler and more efficient could do it as well.

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-	SU. [email protected]
-	SU. [email protected]
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Conditional "updates" to a method...?

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