I make a movie theater system. And i keep the movies and movie theaters in a jTable. Also I'm trying to show the movie theater. Movie theater seats made from JButton and I keep these seats in a jpanel.
How can i show the seats when the movie theater selected?
And this is my code.
final ArrayList<JPanel> panels = new ArrayList<>();
for(int k=0;k<theater.size();k++){
JPanel panel = new JPanel();
panel.setBounds(500, 0, 500, 500);
contentPane.add(panel);
int y = theater.get(k).getCapacity();
int x = 500/y;
for(int i=0;i<y;i++){
for(int j=0;j<y;j++){
JButton button = new JButton(letters[i]+numbers[j]);
button.setBounds(500 + x*j, 0 + x*i, x-5, x-5);
panel.add(button);
}
}
repaint();
panels.add(panel);
}
Don't use setBounds() method instead leave it for Layout Manger to set the size and position of the components that why it's made for.
Use proper layout for this design such as GridLayout, GridBagLayout etc.
Read more about layout How to Use Various Layout Managers
Don't directly add the components in the JFrame's content pane instead first add the components in another container such as JPanel then finally add it in the JFrame's content pane.
Related
JAVA Swing Problem
I want to create a list of JButtons based on a list of strings, which represents the button text.
In my first step, I collect my data for the button texts from an external text file. This data is stored in the data variable.
List<String> data = ReadFile("texts.txt")
Now I want to create the list of JButtons, named buttons. There I set their text and their Bounds. The Bounds are relative to the index, so the buttons are placed below each other. Finally, I add the button to the frame and to the buttons list.
List<JButton> buttons = new ArrayList<>();
for (int index = 0; index < data.size(); index++) {
JButton button = new JButton();
button.setText(data.get(index));
button.setBounds(0, index*50, 100, 50);
add(button);
buttons.add(button);
But when I execute this, the last Button ends big, the first ones also disappear when I don't hover over them, but that's based on the fact, that the last button ist placed above:
Picture of the executed script
The last button has the size of the frame, doesn't matter, if I resize the frame:
Picture of the resized screen
I hope someone can help me or tell me where I can find help. Thanks.
the last Button ends big, the first ones also disappear when I don't hover over them,
That is because by default the content pane of the JFrame uses a BorderLayout. When you add a component to the BorderLayout the button is added to the CENTER. However, only a single component can be added to the CENTER, so only the size/location of the last component added is managed by the BorderLayout.
Don't attempt to set the size/location of your components manually. It is the job of a layout manager to do this. In your case you can use a couple of panels with different layout so align your button in a column on the left. Something like:
JPanel buttonPanel = new JPanel( new GridLayout(0, 1) );
for (int index = 0; index < data.size(); index++) {
JButton button = new JButton();
button.setText(data.get(index));
button.setBounds(0, index*50, 100, 50);
//add(button);
buttonPanel.add( button );
buttons.add(button);
}
add(buttonPanel, BorderLayout.LINE_START);
Try the above code and you will notice that the buttons are all the same size, but the size keeps changing as the height of the frame changes.
So to prevent this resizing we need to allow the button to be displayed at their preferred height by using an additional layout manager:
//add(buttonPanel, BorderLayout.LINE_START);
JPanel wrapper = new JPanel( new BorderLayout() );
wrapper.add(buttonPanel, BorderLayout.PAGE_START);
add(wrapper, BorderLayout.LINE_START);
Read the Swing tutorial on Layout Manager for more information and examples.
I am trying to make a 2x2 grid layout that has a JLabel on the top left, and three buttons on the other three spaces. When I do this, I get the unexpected result of one big button (filling up the entire JDialog) that says "Do you want to push me". I don't know why this result shows up, please help, Thanks!
public void sinceyoupressedthecoolbutton() {
JDialog replacementwindow = new JDialog(); //Like a window
JButton best = new JButton("best");
JButton first = new JButton("FIRST");
JButton second = new JButton("Second");
replacementwindow.setLayout(new GridLayout(2,3,0,0)); //Row, column, distance horizontally, distance vertical
JPanel panel = new JPanel();
replacementwindow.add(panel); //adding the JPanel itself
replacementwindow.add(first);
replacementwindow.add(second);
replacementwindow.add(best);
replacementwindow.setSize(500, 500);
replacementwindow.setTitle("NEW WINDOW!");
replacementwindow.setVisible(true);
}
It's because you set the layout of your JButton, and not of your JDialog
Change
label.setLayout(new GridLayout(2,2,0,0));
to
YES.setLayout(new GridLayout(2,2,0,0));
Also, your variable called label is a JButton, you probably want to change that.
Don't add components to a button. You add components to a panel.
So the basic code should be:
JDialog dialog = new JDialog(...);
JPanel panel = new JPanel( new GridLayout(...) );
panel.add(label);
panel.add(button1);
...
dialog.add(panel);
Also, variable names should NOT start with an upper case character! "Yes" does not follow Java standards. The other variables do. Be consistent!
How do i put Jlabel and Jtext in the same frame?
if i add the text last, then only the text are showen, thes is my code:
public MatrixFrame(String framname, int width, int height) {
width =7;
height = 6;
JFrame fram = new JFrame(framname);
fram.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
fram.setSize(500,500);
JTextArea text = new JTextArea("Here come Text");
valMatrixPanel = new ValMatrixPanel(height,width,Color.GRAY, Color.black);
JPanel pan = valMatrixPanel.getPan(); // pan is 6*7 panels lock the picture
fram.add(pan);
fram.add(text);
fram.setVisible(true);
}
}
The key to solving this is your understanding how to use layout managers, because this is how Swing decides where to put what and how to size things. First off for a quick easy fix, put all your components into a JPanel, which uses a FlowLayout by default, and then add the JPanel to your JFrame. Don't set the JPanel's or the JFrame's size, do call pack() on the JFrame after adding everything and then finally call setVisible(true).
The better long term answer: read the layout manager tutorials which you can find, among the other Swing tutorials: here.
Try this
you will have to add a import for grid layout
check that
all you need to do is add a grid layout because the textbox overlaps the panel.
so add the line
fame.getContentPane().setLayout(new GridLayout(1,1));
JPanel pan = valMatrixPanel.getPan(); // pan is 6*7 panels lock the picture
fame.getContentPane().setLayout(new GridLayout(1,1));
fram.add(pan);
fram.add(text);
fram.setVisible(true);
use BorderLayout in fram.add()
like this
public MatrixFrame(String framname, int width, int height) {
width =7;
height = 6;
JFrame fram = new JFrame(framname);
fram.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
fram.setSize(500,500);
JTextArea text = new JTextArea("Here come Text");
valMatrixPanel = new ValMatrixPanel(height,width,Color.GRAY, Color.black);
JPanel pan = valMatrixPanel.getPan(); // pan is 6*7 panels lock the picture
fram.add(pan,BorderLayout.WEST);
fram.add(text,BorderLayout.NORTH);
fram.setVisible(true);
}
So im writing a small test program for fun replicating a inventory from games like minecraft and runescape. Basically a frame with another one inside it, and pictures of your items in it, and a scroll bar to scroll down through all the stuff you have in your inventory. The "Stuff" i would have in my inventory would be buttons added later on with their own functionality, so you can scroll through vertically and see all the "stuff." Right now i have some test buttons being added to deomsntrate the error. Basically i want the buttons to be 100,100 and for them to be in a row of 4, and go onto the next column. I though GridLayout would be the best choice, but it seems to add more rows after being added into a scrollpane. Well heres the code skimmed down:
public class inventory extends JFrame{
public static void main(String[] args){
new inventory();
}
JPanel mainInv = new JPanel();
JScrollPane sp;
public inventory(){
setSize(500,500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Toolkit tk = this.getToolkit();
setLocation(tk.getScreenSize().width/2-getWidth()/2, tk.getScreenSize().height/2-getHeight()/2);
setLayout(null);
mainInv.setSize(getWidth()-10, 1000);
mainInv.setBackground(Color.blue);
mainInv.setLayout(new GridLayout(8,4));
sp = new JScrollPane(mainInv, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
sp.setMaximumSize(new Dimension(400,400));
sp.setBounds(5, 5, 500-10, 500-130);
JButton[] testButs = new JButton[100];
for(int i = 0; i < 50; i++){
testButs[i] = new JButton("Test Button " + i);
testButs[i].setSize(100,100);
mainInv.add(testButs[i]);
}
add(sp);
setVisible(true);
}
}
With GridLayout the number of rows is the dominating factor.
If you have 8 rows and 4 columns that can only fit 48 buttons, if you try to add a 49th button it will create a 5th column not a 9th row.
You can solve your problem by setting up the GridLayout with more rows.
I have:
public class BaseStationFrame1 extends JFrame
{
JButton activateButton;
JButton deactivateButton;
BaseStation bs;
JTextField networkIdField;
JTextField portField;
public BaseStationFrame1(BaseStation _bs){
bs = _bs;
setTitle("Base Station");
setSize(600,500);
setLocation(100,200);
setVisible(true);
activateButton = new JButton("Activate");
deactivateButton = new JButton("Deactivate");
Container content = this.getContentPane();
content.setBackground(Color.white);
content.setLayout(new FlowLayout());
content.add(activateButton);
content.add(deactivateButton);
networkIdField = new JTextField("networkId : "+ bs.getNetworkId());
networkIdField.setEditable(false);
content.add(networkIdField);
portField = new JTextField("portId : "+ bs.getPort());
portField.setEditable(false);
content.add(portField);}
}
My problem is that i don't want the two TextFields to appear on the right of Activate and Deactivate buttons but below them. How can i fix that?
Specify your layout manager, like this:
content.setLayout(new GridLayout(2,2));
That would use the Grid Layout Manager to establish a grid with 2 columns and 2 rows, that your components would then be placed in.
The layout manager you are currently using, FlowLayout, only adds contents onto the end of the current row. it will wrap around once it reaches the constrained edge of the pane, though.
You should also check the other layout managers here
You could alternatively use GridBagLayout , but you will have to specify a GridBagConstraints object you then add alongside the individual elements, like so:
content.add(networkIdField, gridConstraints);
see more on that in the linked tutorial.
can I suggest that you use a Null Layout for the parent component?
setLayout(null);
then use a setBounds(xPos,yPos, Width, Height);
to position the components on the panel etc?
Doing this will prevent Java's UI Manager to manage the components to the Frame, Panel etc.
That seems to be the easiest and less painful way.
Regards