Trying to Place Order nothing shows up on screen but I want to show a textarea saying:
Here's Sandwhich with the topping u provided
Can you help me?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.GridLayout;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.List;
public void setCheese(String s) {
cheese = s;
}
public String getCheese() {
return cheese;
}}
You should be getting a NullPointerException makeASandwih as sandwich is null, then you try and call an instance method
protected void makeASandwich() {
Sandwich sandwich = null;
sandwich.setCheese(jcbcheese.getItemAt(jcbcheese.getSelectedIndex()));
Try creating a new instance of Sandwich
protected void makeASandwich() {
Sandwich sandwich = new Sandwich();
sandwich.setCheese(jcbcheese.getItemAt(jcbcheese.getSelectedIndex()));
Related
I've been fiddling with TabbedPanes, and I wish to be able to use a method in another class to set which tab is selected.
However, when attempting to do this, I am provided with two errors.
First, it tells me that the parameter 'name' that I have provided the method in the second class has 'private access in Component'
error: name has private access in Component
TabbedPanes.name.setSelectedIndex(0);
Second, it tells me that it cannot find the symbol for the method I wish to call from within the second class' custom method.
error: cannot find symbol
TabbedPanes.name.setSelectedIndex(0);
^
symbol: method setSelectedIndex(int)
location: variable name of type String
My first class, TabbedPanes, can be found below:
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.BoxLayout;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Dimension;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Calendar;
public class TabbedPanes extends JFrame implements ActionListener
{
JTabbedPane tabs;
JPanel pan1, pan2, pan3, pan4, pan5, pan6, pan7, pan8;
JFrame frame;
JScrollPane scroll1, scroll2, scroll3, scroll4, scroll5, scroll6, scroll7, scroll8;
public void Tabs()
{
tabs = new JTabbedPane();
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pan1 = new JPanel(new FlowLayout(FlowLayout.LEFT));
JScrollPane scroll1 = new JScrollPane(pan1);
scroll1.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scroll1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
pan2 = new JPanel();
pan3 = new JPanel();
pan4 = new JPanel();
pan5 = new JPanel();
pan6 = new JPanel();
pan7 = new JPanel();
pan8 = new JPanel();
JScrollPane scroll8 = new JScrollPane(pan8);
scroll8.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scroll8.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
Container pane = frame.getContentPane();
pane.add(tabs);
tabs.add("Mon", scroll1);
tabs.add("Tue", pan2);
tabs.add("Wed", pan3);
tabs.add("Thu", pan4);
tabs.add("Fri", pan5);
tabs.add("Sat", pan6);
tabs.add("Sun", pan7);
tabs.add("Notes", scroll8);
Dates datesObject = new Dates();
datesObject.tabOnStartup("tabs");
frame.setSize(400,400);
frame.setVisible(true);
}
public static void main(String[] args)
{
TabbedPanes TrueTabs = new TabbedPanes();
TrueTabs.Tabs();
}
}
The second class, Dates, can be found below:
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.BoxLayout;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Dimension;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Calendar;
public class Dates
{
public void tabOnStartup(String name)
{
TabbedPanes.name.setSelectedIndex(0);
}
Any help will be greatly appreciated, and I hope my code is clean enough to read well.
If I got you right, you have to change the variable JTabbedPane tabs in class TabbedPanes to static:
static JTabbedPane tabs;
Also in class Dates you have to use
TabbedPanes.tabs.setSelectedIndex(0);
instead of
TabbedPanes.name.setSelectedIndex(0);
It seems that you have not implemented a method in class TabbedPanes :
#Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
}
If you are using IDE like Eclipse, NetBeans, etc. you should've received an error message like
- The type TabbedPanes must implement the inherited abstract method
ActionListener.actionPerformed(ActionEvent)
After these ammendments the result is:
I have the next problem: I'm calling a class from my Main, that have to show a JFrame. I can't even continue with my program because when I try to run it, the JFrame doesn't show.
I'm using Eclipse.
Main:
package System;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.awt.Menu;
import java.awt.*;
import javax.*;
import javax.swing.event.*;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Main {
public static void main(String[] args) {
new Menu();
}
}
Second class:
package System;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.awt.*;
import javax.*;
import javax.swing.event.*;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Menu {
private JFrame ventana = new JFrame("Sistema de Productos Químicos");
private JButton sup = new JButton("Supervisor");
private JButton oper = new JButton("Operario");
Menu()
{
ventana.setSize(500,500);
ventana.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ventana.add(sup);
ventana.add(oper);
ventana.setVisible(true);
}
}
Thanks!
because your jframe class name is Menu and you have import
import java.awt.Menu;
this create a new awt menu instead of your Menu class which create a jframe
new Menu();
to fix this change the name of the Menu class to something different.
for instance
public class MyMenu { //
If you play around with System.out.println("Say something random"), which is something to do when your program is not working and it is not syntax error, you find out that the Main class is not even calling the Menu class, so that "cuts down" your area of search on what's srong, I have not found the problem, and will update the answer when I do.
I'm trying to load an image but my code continuously enters the catch statement. I followed the example provided on: http://docs.oracle.com/javase/tutorial/2d/images/examples/LoadImageApp.java.
I really don't understand what the programming error is here.
import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.accessibility.Accessible;
import javax.imageio.ImageIO;
import javax.swing.*;
public class RackBuilder extends javax.swing.JFrame {
BufferedImage img;
/**
* Creates new form RackBuilder
*/
public RackBuilder() {
initComponents();
JPanel rackGrid = new JPanel(new GridLayout(42,0));
try {
img = ImageIO.read(new File ("alexi.jpg"));
} catch (IOException e){
System.out.println("Image could not be read.");
System.exit(1);
}
add(rackGrid);
}
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new RackBuilder().setVisible(true);
}
});
}
Thanks!
What I'm trying to do is simple. I have a JLayeredPane with two panels inside of it. Panel 2 (higher Z index) has a transparent background and only displays a Line2D element that goes from Y = 0 to Y = max. I need the X value to increment every so many milliseconds, and then redraw the line. I have everything set up to do so, except I can't figure out how to do the bar movement via timing.
I've done some research and every time I saw mentions of the timer class (Which I feel would be able to accomplish what I'm trying to do) people recommend not using it. I can't figure out an alternative to using the timer class in order to slide my bar across the screen.
Hope this code helps you. It does exactly what you want.
import javax.swing.JFrame;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.JPanel;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Random;
import java.util.Arrays;
import java.awt.EventQueue;
import javax.swing.JFrame;
public class FloorPlaner extends JFrame {
public int x=0;
public FloorPlaner(){
super("FloorPlaner");
requestFocus();
setContentPane(new DrawingPane());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(400, 400);
setResizable(true);
setVisible(true);
while (true) {
x++;
repaint();
try {
Thread.sleep(40); //25 FPS
} catch(InterruptedException bug) {
Thread.currentThread().interrupt();
System.out.println(bug);
}
}
}
class DrawingPane extends JPanel { //Where you actually draw on
public void paintComponent(Graphics g) { //Drawing method
g.drawLine(x,0,x,400);
}
}
public static void main(String args[]) {
new FloorPlaner(); //Start it
}
}
I have a small problem, I have tried different solutions to add a image from URL in my jPanel, but I don't succeed. This is how my jPanel looks like:
import javax.swing.DefaultListModel;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import java.awt.Color;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;
public class Hello extends JPanel{
JPanel panel = new BackgroundPanel();
JPanel HomeWindowPanel;
JLabel secondlbl = new JLabel("Hello");
public Hello () {
//I want to add a picture here from URL
}
}
I would really appreciate if somebody could show me how to do it.
Check out this sample code:
http://docs.oracle.com/javase/tutorial/displayCode.html?code=http://docs.oracle.com/javase/tutorial/uiswing/examples/components/LabelDemoProject/src/components/LabelDemo.java
Specifically the createImageIcon method.