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jefff willis

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Recent posts by jefff willis

JTable row selection

I'm not sure what you're doing but it's not all that difficult.

Maybe you are getting mouse Up and mouse Down events of some sort.

Here is a quick and dirty example:

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
import javax.swing.table.*;
public class TableListener extends JFrame
{
JTable table = null;
public TableListener() {
super("Table example, Wines from Bordeaux");
Object[][] tabledata = {
{ "Chateau Meyney, St. Estephe", new Integer(1994), "$18.75"},
{ "Chateau Montrose, St. Estephe", new Integer(1975), "$54.25" },
{ "Chateau Gloria, St. Julien", new Integer(1993), "$22.99" },
{ "Chateau Beychevelle, St. Julien", new Integer(1970), "$61.63" },
{ "Chateau La Tour de Mons, Margeaux", new Integer(1975), "$57.03" },
{ "Chateau Brane-Cantenac, Margeaux", new Integer(1978), "$49.92" },
};
String columnheaders[] = { "Wine", "Vintage", "Price" };
table = new JTable(tabledata, columnheaders);
table.setPreferredScrollableViewportSize(new Dimension(300, 150));
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
JScrollPane scrollPane = new JScrollPane(table);
getContentPane().add(scrollPane);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent we) {
System.exit(0);
}
});
MyMouseListener MML = new MyMouseListener();
table.addMouseListener(MML);
pack();
}
public static void main(String []args)
{
TableListener tlb = new TableListener();
tlb.show();
}
private class MyMouseListener extends java.awt.event.MouseAdapter
{
public void mouseClicked( java.awt.event.MouseEvent e)
{
System.out.println("selected row = " + table.getSelectedRow());
}
}
}

19 years ago

Swing / AWT / SWT

how to add an hyperlink

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.net.*;
public class HyperLinkLabel extends JFrame
{
public HyperLinkLabel()
{
JPanel p = new JPanel();
final String strURL = "http://www.yahoo.com";
final JLabel label = new JLabel("<html><a href=\" " + strURL + "\"> click </a></html>");
final JEditorPane htmlPane = new JEditorPane();
p.add(label);
getContentPane().add(BorderLayout.NORTH, p);
getContentPane().add(BorderLayout.CENTER, new JScrollPane(htmlPane));
setBounds(20,200, 500,500);
label.addMouseListener(new MouseAdapter() {
public void mouseEntered(MouseEvent me) {
label.setCursor(new Cursor(Cursor.HAND_CURSOR));
}
public void mouseExited(MouseEvent me) {
label.setCursor(Cursor.getDefaultCursor());
}
public void mouseClicked(MouseEvent me)
{
System.out.println("Clicked on Label...");
try {
htmlPane.setPage(new URL(strURL));
}
catch(Exception e) {
System.out.println(e);
}
}
});
}
public static void main(String[] args)
{
HyperLinkLabel hll = new HyperLinkLabel();
hll.show();
}
}

19 years ago

Swing / AWT / SWT

JTable; Vectors & Boolean values

cut and paste this code to see an example that runs:

package testing;
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.awt.event.*;
import java.util.*;
public class fiona extends JFrame//implements Listener
{
private JTable tblReportDefinitions;
private Vector definitionColumns;
private Vector definitionData;
// private Vector reports;
private Vector schedules;
public fiona()//Vector sched
{
super("Report Definition");
// reports = rep;
definitionColumns = new Vector();
definitionColumns.add("Delete?");
definitionColumns.add("Report Name");
definitionColumns.add("Report Requester");
definitionColumns.add("Destination");
definitionData = new Vector();
//definitionData.add(new Boolean(true));
//loop through vector of report definition objects
//ReportDefinitionPOJO pojo = new ReportDefinitionPOJO();
// for(Enumeration e = reports.elements();e.hasMoreElements() :wink:
for (int i = 0; i < 10; i++)
{
Vector rowOfData = new Vector();
rowOfData.add(0, new Boolean(false));
rowOfData.add("pojo name");
rowOfData.add("pojo requestor");
rowOfData.add("pojo destination");
definitionData.add(rowOfData);
}
//refrsh the vector with the data
System.out.println(definitionData);
System.out.println(definitionColumns);
//dtm.setDataVector(definitionData, definitionColumns);
tblReportDefinitions = new JTable(definitionData, definitionColumns);
getContentPane().setLayout (new BorderLayout());
JScrollPane scrollPane = new JScrollPane (tblReportDefinitions);
Container con = getContentPane();
con.add(scrollPane, BorderLayout.CENTER);
setSize(500, 400);
setLocation(200, 200);
setVisible(true);
}
public static void main(String[] args) {
fiona f = new fiona();
f.show();
}
}

19 years ago

Swing / AWT / SWT

recursion--need help pseudocoding/setting up

It's not a complicated problem. Every one who has studied Computer Science in college has had to solve this problem.

Here is a link that may provide you with more information.

http://www.mactech.com/articles/mactech/Vol.13/13.12/TheEightQueensProblem/

19 years ago

Java in General

Java Networking Question

Well, how would you do it in a language other than JAVA?

19 years ago

Java in General

JTable; Vectors & Boolean values

This is just a quick evaluation of your code, but I believe I see yout create fours columns of data headers and you try to fill it with five columns of data.

(there are two Boolean elements at the beginning of your data Vector)

19 years ago

Swing / AWT / SWT

Forcing size of JPanel

Not that I know of.

It's less of a PITA if you use a IDE that has some sort of graphical design module.

I use JBuilder and it seems to easy enough to get along with.

19 years ago

Swing / AWT / SWT

recursion--need help pseudocoding/setting up

This sounds to me like a basic undergraduate level computer science assignment.

If it is, then you will probably have a lab class that goes along with the lecture portion.

In the lab class the instructor (probably a grad student) will give you algorithms and insight on how to design your application. He will probably be your best source of information. We will be a good source of information when you get stuck in some of the coding.

19 years ago

Java in General

The String class represents character strings. All string literals in Java programs, such as "prasad", are implemented as instances of this class.

Strings are constant; their values cannot be changed after they are created. String buffers support mutable strings. Because String objects are immutable they can be shared. For example:

String str = "prasad";

This creats a string literal, sets it's contents to "prasad" and pases the reference to that literal back to your variable [str].

This however:

String str = new str("prasad");

creates a string literal and sets contents to "prasad" (just like above). But a new string is created and the reference to that literal is passed to it. THEN that new string's referenc is passed to your variable [str].

Since TWO string literals are created in the second example, use the first one in your programs.

19 years ago

Java in General

extracting an integer value from a JTable(sounds so easy :S)

Did you create the table and it's data?

Did you put an [integer] 8 in that column or a [String] "8"?

19 years ago

Swing / AWT / SWT

Forcing size of JPanel

I think your problem is actually with your LayoutManager.

You can set a panels layout manager to null.

Do that, and then set the size of your panel to whatever you like. Just remember that any components you place on that panel will now have to have their locations specified also.

19 years ago

Swing / AWT / SWT

JButton with bad Labels

invoke the toString() method of your array elements:

Just copy and past the code .

19 years ago

Swing / AWT / SWT

Disabling mouse-click over JTable

Two ideas come to mind...

1. actually disable the table (and scrollpane if you have one)

2. enable mouse events but do nothing with them

19 years ago

Swing / AWT / SWT

JTable with JButtons in header

Change your MouseClicked method to include columnAtPoint, not getSelectedRow.

Here is a code fragment...

19 years ago

Swing / AWT / SWT

jtable and the scrollbar

Has anyone ever programitcally changed their horizontal scrollbar?

I'm using a JTable in a scrollPane and I need to take three simple steps:

1. get the current position of the horizontal scroll bar
2. recreate the table with new data (not a problem)
3. reposition the scrollbar on the new table to the same position as the old table

Can anyone give me an idea how to get the horizontal scrollbar position?

I tried this approach but haven't had much luck:

19 years ago

Swing / AWT / SWT