Making optgroup /optgroup in Java
Is it possible to implement this drop-down box in a Java Swing application? I kept searching for this from the web, but I cant find relevant info. I cant make the optgroup function in neither JComboBox nor JList. Tell me how to do it, if you have this experience.
Thanks in advance!
<select>
<optgroup label="Swedish Cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
</optgroup>
<optgroup label="German Cars">
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</optgroup>
</select>
Sorry for my inaccurate English.
And thank you DarrylBurke for the correction, I have looked it in the dictionary.
Back to my question, actually I have a particular question about making the list items of JComboBox not selectable, as in the first picture. The second picture is the Swing version, in which I'm not able to make it not selectable.
[1. HTML combo box|http://home.netvigator.com/~bigblack/labu/drop-down-box.gif]
[2. JComboBox|http://home.netvigator.com/~bigblack/labu/drop-down-box-swing.png]
I always read the suggested tutorials, the closest parts are about implementing ActionListener and ListCelRenderer. Do I have a more-convenient alternative?
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jverd wrote:
Adrienk wrote:
can I make a program that will interact with a database (lets say oracle)Google for jdbc tutorial.
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Making https: connection from java code loaded into Oracle 8i database
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I need to provide an PL/SQL function which accesses a RESTful web service requiring https connection. Got the call working under 1.2 locally without much trouble using:
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-------------------- the java code:
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------------------------------ the error:
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s.renderkit.core.xhtml.SimpleSelectOneRenderer _getSelectedIndex
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....That's right. JSF produces such IDs. They are causing problems with JAAS login forms, so we should use plain JSPs for login, but for the rest of the tasks such IDs are okay.
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Need help making pace invaders in java
So here is my code:
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.*;
import javax.swing.JFrame;
import java.awt.*;
import javax.swing.JPanel;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.net.URL;
import javax.imageio.ImageIO;
public class invaders extends Canvas {
public static final int Width = 800;
public static final int Height = 600;
public invaders() {
JFrame openspace = new JFrame("Space Invaders");
JPanel window = (JPanel)openspace.getContentPane();
setBounds(0,0,Width,Height);
window.setPreferredSize(new Dimension(Width,Height));
window.setLayout(null);
window.add(this);
openspace.setBounds(0,0,Width,Height);
openspace.setVisible(true);
openspace.addWindowListener( new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
public void paint(Graphics graph) {
// graph.setColor(Color.red);
// graph.fillOval( Width/2-10, Height/2-10,20,20);
// spacealien = loadImage("spaceAlien.jpg");
// graph.drawImage(spaceAlien, 50, 50, this);
public static void main(String[] args) {
invaders spaceinvaders = new invaders();
I am trying to add pictures into the JFrame but I don't know how. I am following this tutorial http://www.planetalia.com/cursos/Java-Invaders/JAVA-INVADERS-04.tutorial but I get confused when they talk about how to add in an image.
This is their Code:
1 package version04;
2 /**
3 * Curso B?sico de desarrollo de Juegos en Java - Invaders
4 *
5 * (c) 2004 Planetalia S.L. - Todos los derechos reservados. Prohibida su reproducci?n
6 *
7 * http://www.planetalia.com
8 *
9 */
10
11
12 import java.awt.Canvas;
13 import java.awt.Dimension;
14 import java.awt.Graphics;
15 import java.awt.event.WindowAdapter;
16 import java.awt.event.WindowEvent;
17 import java.awt.image.BufferedImage;
18 import java.net.URL;
19
20 import javax.imageio.ImageIO;
21 import javax.swing.JFrame;
22 import javax.swing.JPanel;
23
24 public class Invaders extends Canvas {
25 public static final int WIDTH = 800;
26 public static final int HEIGHT = 600;
27
28
29 public Invaders() {
30 JFrame ventana = new JFrame("Invaders");
31 JPanel panel = (JPanel)ventana.getContentPane();
32 setBounds(0,0,WIDTH,HEIGHT);
33 panel.setPreferredSize(new Dimension(WIDTH,HEIGHT));
34 panel.setLayout(null);
35 panel.add(this);
36 ventana.setBounds(0,0,WIDTH,HEIGHT);
37 ventana.setVisible(true);
38 ventana.addWindowListener( new WindowAdapter() {
39 public void windowClosing(WindowEvent e) {
40 System.exit(0);
41 }
42 });
43 }
44
45 public BufferedImage loadImage(String nombre) {
46 URL url=null;
47 try {
48 url = getClass().getClassLoader().getResource(nombre);
49 return ImageIO.read(url);
50 } catch (Exception e) {
51 System.out.println("No se pudo cargar la imagen " + nombre +" de "+url);
52 System.out.println("El error fue : "+e.getClass().getName()+" "+e.getMessage());
53 System.exit(0);
54 return null;
55 }
56 }
57
58
59 public void paint(Graphics g) {
60 BufferedImage bicho = loadImage("res/bicho.gif");
61 g.drawImage(bicho, 40, 40,this);
62 }
63
64 public static void main(String[] args) {
65 Invaders inv = new Invaders();
66 }
67 }
68
I know there must be an easier way. Please help, thanks!!!!One way to add an image to a user interface is to use a JLabel with an ImageIcon: [http://java.sun.com/docs/books/tutorial/uiswing/components/label.html]
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Making phone call from Java Swing
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Hi
I want to take data from a mySQL database and show it in an applet as a graph.
The problem I'm having is creating the graph.
Does anyone know a fairly simple way to do this?
thanksthis can get you started:
go and google for "applet drawing java source code"
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i have been trying to make a java applet in which:
there is a circle as an eye (using the drawOval())
and then there is an eyeball (using the fillOval())
the eyeball is supposed to follow the movements of the mouse cursor...
and i m not able think of any idea to do that...
can anyone please give me an idea as to how to do this??the code i posted earlier was opaque and unclear, so this time i post a clearer code
//moving eyeball
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class eyeball extends Applet implements MouseMotionListener
//(x1,y1)=mouse co-ordiantes
//(x,y)=eyeball co-ordianates
//(cx,cy)=eye-centre co-ordinates
//r=radius of eye
int x1,y1,x,y,cx,cy,r;
double m,k1,k2,k3,k4,k5,k6,k7,k8,pvx,pvy,pvx2,pvy2; //these are intermediate values to eventually get the values of (x,y)
//and are described below as and when required
public void init()
addMouseMotionListener(this);
public void mouseMoved(MouseEvent e)
x1=e.getX();
y1=e.getY();
cx=330;
cy=330;
r=30;
//"slope_numerator" is the numerator part in the formula of slope of the line
//(m=y2-y1/x2-x1) the line here is the line joining the centre of the cirle to
//the co-ordinates of the mouse
double slope_numerator=(y1-cy);
//"slope_dinominator" is the dinominator part in the formula of slope
//(m=y2-y1/x2-x1) the line here is the line joining the centre of the cirle to
//the co-ordinates of the mouse
double slope_dinominator=(x1-cx);
//slope of the line
m=slope_numerator/slope_dinominator;
//start of finding values of x
//from the equation y-y1=m(x-x1) we make y the subject of formula . i.e. y = mx - (mx1-y1)
//so here k1=mx1-y1
//so the equation of line is y=mx-k1
//product_m_and_x1 is the product of m*x1
double product_m_and_x1=m*x1;
//so ,k1 difference between product_m_and_x1 and y1
k1= product_m_and_x1-y1;
//from the equation of circle r^2=(cx-x)^2 +(cy-y)^2 (where r=radius and r^2 => (r squared and so on)
//now i substitute equation of line(y=mx-k1) in equation of circle
//r^2=(cx-x)^2 + (cy-(mx-k1))^2
//i group (k1+cy) together as k2 ie k2=k1+cy
//so the equation becomes
//r^2=(cx-x)^2+(k2-mx)^2..............................................................................(equation2)
k2=cy+k1;
//when the equation2 is expanded we get
//r^2=[(cx)^2 + (k2)^2] - x(2*cx+2*(k2)m) + x^2(1+m^2)...............................(equation3)
//taking k3=[(cx)^2+(k2)^2] ie.sum of cx_squared and k2_squared
//cx_squared is square of cx value
double cx_squared=cx*cx;
//k2_squared is square of k2 value
double k2_squared=k2*k2;
k3=cx_squared+k2_squared;
//from equation3(r^2=(cx)^2+(k2)^2-x(2*cx+2*(k2)m)+x^2(1+m^2))
//take k4=[2*(cx)+2*(k2)*m] ie.sum of 2 times cx and 2*m times k2
//cx_times_2 is 2*cx
double cx_times_2=2*cx;
//k2_times_2_times_m is 2*k2*m
double k2_times_2_times_m=2*k2*m;
//therefore calculating k4
k4=cx_times_2 + k2_times_2_times_m;
//from equation3(r^2=(cx)^2+(k2)^2-x(2*cx+2*(k2)m)+x^2(1+m^2))
//take k5=[1+m^2] ie sum of m_squared and 1
//first calculate m_squared as m*m
double m_squared=m*m;
//calculate k5=[1+m^2]
k5=1+m2_squared;
//so the equation3 is reduced to r^2=k3 - x(k4) + x^2(k5)
//bringing r^2 to Right Hand Side(RHS) ....
//0=[k3-r^2] - x(k4) + x^2(k5)...............................................................................(equation4)
//k6=[k3-r^2]
//Therefore the quadratic equation in x becomes
//x^2(k5) - x(k4) +k6 = 0.....................................................................................(equation5)
//first we calculated k6
//for that we need value of r_squared
//therefore we calculate r_squared = r*r
double r_squared=r*r;
//then we find k6=k3-r^2 in equation4
k6=k3-r2;
//we now solve the quadratic equation in x of the (equation5)
//for that we use the standard formula used to get the value of x in the equation
// (a)x^2+(b)x+c=0
//which is x= {-b (-+) squareroot of (b_squared - 4*a*c)}/(whole divided by 2*a)
//in (equation5):: a=k5, b=-k4 , c=k6
//first we find the value of the determinant ie. squareroot of (b_squared - 4*a*c)
//so since k4 is b here we find the value of k4_squared
double k4_squared=k4*k4;
//then we find the value of 4*a*c
//so since a=k5 and c=k6 we store the value of product into the variable k5k6
double k5k6=4*k5*k6; //(ok u guys were right the coding earlier was horrible. there was a mistake here)
//now we find the difference of b_squared and 4*a*c ie. k4_squared and k5k6
double discriminant_squared=k42-k5k6;
//then we find the discriminant_value by taking square root of discriminant_squared
discriminant_value=Math.sqrt(discriminant_squared);
//we then find the dinominator_value in the formula. ie. 2*a
//the value of a here is k4. so dinominator_value becomes 2*k4
dinominator_value=2*k4;
//then we calculate the value of => (-b - discriminant_value )
//here that would be difference between k4 and discriminant_value
double numerator_value1=k4-discriminant_value;
//then we find the first possible value of x (pvx)
//the first possible value of x(pvx) is numerator_value1/dinominator_value
//since, numerator_value1 represents [-b - squareroot of (b_squared - 4*a*c)]
pvx=numerator_value1/dinominator_value;
//then we calculate the value of => (-b + discriminant_value )
//here that would be sum of k4 and discriminant_value
double numerator_value2=k4+k7;
////then we find the second possible value of x (pvx2)
//the second possible value of x(pvx2) is numerator_value2/dinominator_value
//since, numerator_value2 represents [-b + squareroot of (b_squared - 4*a*c)]
pvx2=numerator_value2/dinominator_value;
//So the two possible x values are pvx,pvx2
//end of finding values of x
//start of finding values of y
//from the equation y-y1=m(x-x1) we made y the subject of formula . i.e. y = mx - (mx1-y1) or y=mx -k1
//now we have the value of x as pvx and pvx2 so now we can find values of y
//product_mx1 represents the product of mx in the equation y=mx-k1 when x is pvx
double product_mx1=m*pvx;
//product_mx2 represents the product of mx in the equation y=mx-k1 when x is pvx2
double product_mx2=m*pvx2;
//so now we can calculate the possible value of y(pvy and pvy2) corresponding to possible value of x(pvx and pvx2)
//so pvy is product_mx1 - k1 form the equation y=mx - k1
pvy=product_mx1-k1;
//similarly pvy2 is product_mx2 -k1 from the equation of line y=mx-k1
pvy2=product_mx2-k1;
//end of finding values of y
//but the values of (pvx,pvy) and (pvx2,pvy2) are in double , so convert them to int
//therefore
x=(int) pvx;
y=(int) pvy;
//so the co-ordinates of the eyeball should be (x,y)
//(x,y) is the point on the eye(circle) which satisfies the line joining the mouse pointer co-ordinates and centre of eye(circle)
//end of calculations
repaint();
//end of mouseMoved method
public void mouseDragged(MouseEvent e){}
public void paint(Graphics g)
//the eye
g.drawOval(300,300,60,60);
//the eyeball
g.fillOval(x,y,20,20);
//the line joining the centre of eye(circle) to the position of mousepointer
g.drawLine(330,330,x1,y1);
//calculated values for the sake of reference
g.drawString("x1,y1="+x1+"::::"+y1,50,50); //this shows current co-ordinates of mouse pointer
g.drawString("m="+m,50,65); //this shows the slope(m) of the line y=mx-k1
g.drawString("k1="+k1,50,80); //this shows the value of k1
g.drawString("k2="+k2,50,95); //this shows the value of k2
g.drawString("k3="+k3,50,110); //this shows the value of k3
g.drawString("k4="+k4,50,125); //this shows the value of k4
g.drawString("k5="+k5,50,140); //this shows the value of k5
g.drawString("k6="+k6,50,155); //this shows the value of k6
g.drawString("k7="+k7,50,170); //this shows the value of k7
g.drawString("k8="+k8,50,185); //this shows the value of k8
g.drawString("pvx,pvy="+pvx+"::::"+pvy,50,200); //this shows current co-ordinates (pvx,pvy)
g.drawString("pvx2,pvy2="+pvx2+"::::"+pvy2,50,220); //this shows current co-ordinates (pvx2,pvy2)
g.drawString("x,y="+x+"::::"+y,50,240); //this shows current co-ordinates of the eye-ball(fillOval)
//end of paint method
//end of applet
/*<applet code="eyeball" height=800 width=600></applet>*/ -
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SSoon after updating to the. Ios8.1 on my iPhone 4s I ended up losing cellular network..
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Love full screen view, but my file information and data are showing along the footer. How do I change me settings so this doesn't show? Thanks!!!!
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Why doesnt my volume work but my ringer does?
Today from a minute to another my volume just stopped working,but meanwhile my ringer still works,what should i do?
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How to delete or change prefs about coloursettings?
FXPX: In de text/font-caracter-choise department (rightcorner at top) by clicking on NORMAAL you can make a choise and you save the settings you made in three way's. Then it is stored between the other pre-made-settings by fcpx. Question: 1. how to r