I am using Netbeans to create a Java desktop application. I have created two different JPanels. In one I have inserted a button, and in the other just some settings. How can I connect the JButton, in the other JPanel, to change the settings of the other one? What code should I use? (Keep in mind that I am a beginner.)
A very simple programm. It dosen't matter if the button and the label are in the same JPanel or not.
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setBounds(100, 100, 300, 300);
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(300, 150));
JLabel label = new JLabel("Test string");
JButton button = new JButton("Push me");
button.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent arg0) {
label.setText("change text");
}
});
panel.add(label);
panel.add(button);
frame.add(panel);
frame.setVisible(true);
Related
I am trying to make two buttons in JPanel side by side. I have the following code as of now:
JFrame frame = new JFrame("Display Shapes");
JPanel panel = new JPanel();
panel.setLayout(new FlowLayout());
JButton button = new JButton();
button.setBounds(50,100,80,30);
button.setText("Load Shapes");
panel.add(button);
JButton button2 = new JButton();
button2.setBounds(100,100,80,30);
button.setText("Sort Shapes");
panel.add(button2);
frame.add(panel);
frame.setSize(600, 600);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
When I run the code, below is the output I see. I am not sure why the second button is not appearing correctly. What could be the reason for this?
The place where you are writing button.setText("Sort Shapes");, it will be button2.setText("Sort Shapes");
It is changing the text of the first button whose text had been set earlier
I am trying to write a Title for the main menu of my program, by using a JLabel, but it doesn't seem to appear on my screen.
import javax.swing.*;
public class GUI {
public GUI() {
JFrame frame = new JFrame();
JPanel panel = new JPanel();
panel.setBorder(BorderFactory.createEmptyBorder(30,30,10,30));
panel.setLayout(new GridLayout());
frame.add(panel, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Title");
frame.pack();
frame.setSize(854,560);
frame.setVisible(true);
JLabel title = new JLabel();
title.setText("Title");
//title.setSize();
title.setVisible(true);
}
public static void main(String[] args) {
new GUI();
}
}
What am I doing wrong and how could I change the position of the Text if I manage to make it visible?
And I also want to add a button to go to the next page so if you could tell me how to do that too that would be great.
I would quickly and untested say that you are adding the label after you set the frame visible.
Do it before. Else you would have to revalidate and repaint the frame
As I can see in your code you are not adding title in panel. As a quick solution put panel.add(title); after title.setVisible(true); line in your code, it will display the label.
JFrame frame = new JFrame();
JPanel panel = new JPanel();
panel.setBorder(BorderFactory.createEmptyBorder(30,30,10,30));
panel.setLayout(new GridLayout());
frame.add(panel, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Title");
frame.pack();
frame.setSize(854,560);
frame.setVisible(true);
JLabel title = new JLabel();
title.setText("Title");
//title.setSize();
title.setVisible(true);
panel.add(title); //<---- this one line will diaplay label in GUI
This program is supposed to open a window, add a picture, and then add the text "hello world" above the picture. The text appears when i do frame.add(label) and then try to add the picture (like the code shows), but even when I do the opposite and add the picture first I only get a gray schreen. Can anybody show me how I can get both the picture and the text?
public window(){
JFrame frame = new JFrame("name");
JLabel label = new JLabel ("hello world", JLabel.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setSize(600, 400);
frame.setVisible(true);
label.setAlignmentX(0);
label.setAlignmentY(0);
frame.add(label);
frame.add(new JLabel(new ImageIcon("file")));;
}
}
You should use overlay layout, but it is applicable on JPanel.
So add a JPanel to your frame then apply the layout, finally add the components.
Your code may be like that:
public window(){
JFrame frame = new JFrame("name");
JLabel label = new JLabel ("hello world", JLabel.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel() {
public boolean isOptimizedDrawingEnabled() {
return false;
}
};
LayoutManager overlay = new OverlayLayout(panel);
panel.setLayout(overlay);
frame.setResizable(false);
frame.setSize(600, 400);
frame.setVisible(true);
label.setAlignmentX(0);
label.setAlignmentY(0);
panel.add(label);
panel.add(new JLabel(new ImageIcon("file")));
frame.add(panel, BorderLayout.CENTER);
}
}
A label can have both text and icon, and the relative position can be customized.
JLabel label = new JLabel ("hello world", new ImageIcon("file"), JLabel.CENTER);
label.setVerticalTextPosition(SwingConstants.TOP);
frame.add(label);
//frame.add(new JLabel(new ImageIcon("file")));;
The default layout is BorderLayout, and add(label, BorderLayout.CENTER).
I would like to go to another frame of Connect Four by clicking the "PLAY ME" button, but I am very confused on how to do so. Here, I have the code for the opening page of connect four and labels and buttons set up on the page.
Here is my code:
import java.awt.*;
import javax.swing.event.*;
import java.awt.Color.*;
import javax.swing.*;
import java.util.*;
public class Game implements ActionListener{
public Game(){
JFrame frame = new JFrame();
frame.setVisible(true);
frame.setSize(new Dimension(1000,1000));
frame.setTitle("Connect Four");
frame.setLayout(new BorderLayout());
JButton play = new JButton();
play.setPreferredSize(new Dimension(75,150));
play.setBackground(Color.RED);
play.setFont(new Font("Arial", Font.PLAIN, 40));
play.setForeground(Color.BLACK);
play.setText("CLICK ME TO PLAY");
frame.add(play, BorderLayout.SOUTH);
JPanel north = new JPanel(new BorderLayout());
JLabel title = new JLabel("Connect Four");
north.setBackground(Color.WHITE);
title.setFont(new Font("Arial", Font.PLAIN, 100));
title.setForeground(Color.RED);
title.setHorizontalAlignment(0);
title.setVerticalAlignment(1);
frame.add(north, BorderLayout.NORTH);
north.add(title);
JPanel intro = new JPanel(new GridLayout(10,1));
intro.setBackground(Color.WHITE);
JLabel instructions = new JLabel("Instructions");
instructions.setFont(new Font("Ariel", Font.PLAIN, 70));
JLabel instructionsPart1 = new JLabel("Both players will be assigned a color, either red or black.");
JLabel instructionsPart2 = new JLabel("Players will take turns placing the colored discs on to the board.");
JLabel instructionsPart3 = new JLabel("The OBJECTIVE is to get four of one colored discs in a row.");
instructionsPart1.setFont(new Font("Ariel", Font.PLAIN, 35));
instructionsPart2.setFont(new Font("Ariel", Font.PLAIN, 35));
instructionsPart3.setFont(new Font("Ariel", Font.PLAIN, 35));
intro.add(instructions);
intro.add(new JLabel(""));
intro.add(instructionsPart1);
intro.add(new JLabel(""));
intro.add(instructionsPart2);
intro.add(new JLabel(""));
intro.add(instructionsPart3);
intro.add(new JLabel(""));
frame.add(intro, BorderLayout.CENTER);
frame.add(intro);
}
}
Hide Your First Frame And Set Visiblity of second frame to true
btnplay.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
second_add second = new second_add();
setVisible(false); // Hide current frame
second.setVisible(true);
}
});
Rather than changing the frame, change the panel. Instead of using JFrame's add() method, use setContentPane(Container container)
Instead of adding buttons and what not to the frame, create another wrapper panel and use the BorderLayout on that, and then add that panel to the frame:
Example:
JPanel wrapper = new JPanel(new BorderLayout());
wrapper.add(play, BorderLayout.SOUTH);
//etc.
frame.setContentPane(wrapper);
Then, to handle the button click, implement the ActionListener interface. Don't do it with the main class - you'll need more than one. Use an anonymous inner class, or a lambda expression. Example:
play.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
frame.setContentPane(someOtherJPanel);
}
});
So I'm trying to create a gui, I've tinkered with gui's before in java but I'm still new to them. So my issued here is that my JLabels (butLabel & cbLabel) are filled with buttons and checkboxes. Sadly my JFrame will only show whichever is set to the BorderLayout.CENTER. NORTH & SOUTH don't ever show, even if I only set the butLabel to SOUTH and don't even use the cbLabel. What am I overlooking?? It's much appreciated, thanks!
public class mainWindow
{
JFrame frame = new JFrame("Main Window");
JLabel butLabel = new JLabel();
JLabel cbLabel = new JLabel();
JButton showBut = new JButton("Show");
JButton exitBut = new JButton("Exit");
JButton addBut = new JButton("Add");
JButton remBut = new JButton("Remove");
JCheckBox aCB = new JCheckBox("Airplane");
JCheckBox bCB = new JCheckBox("Boat");
JCheckBox cCB = new JCheckBox("Clock");
public mainWindow()
{
frame.setLayout(new BorderLayout()); //I know this is set by default to BorderLayout but I just did it when I was out of options to try.
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setMinimumSize(new Dimension(360, 480));
butLabel.setLayout(new GridLayout(1,4));
cbLabel.setLayout(new GridLayout(2, 2));
butLabel.add(showBut);
butLabel.add(exitBut);
butLabel.add(addBut);
butLabel.add(remBut);
cbLabel.add(aCB);
cbLabel.add(bCB);
cbLabel.add(cCB);
frame.add(butLabel, BorderLayout.CENTER);
frame.add(cbLabel, BorderLayout.NORTH);
}
public void setVisible()
{
butLabel.setVisible(true);//Didn't think I needed butLabel.setVisible or the cbLabel.setVisible but
cbLabel.setVisible(true);//again I was trying things that I thought might make sense.
frame.setVisible(true);
}
}
do not use Label for grouping elements, use JPanel instead
I have tried replace all
Label
with
Panel
it works