I'm having a problem centering all the checkbox inside the panel I already tried using some layout for the panel however It doesn't match the output that I want. As you can see in the output it over-lapse both sides.
Here is my code
total = new JLabel("Total: 0");
compute = new JButton("Compute");
exit = new JButton("exit");
panel = new JPanel();
panel.setBackground(Color.gray);
panel2 = new JPanel();
panel2.setBackground(Color.blue);
panel3 = new JPanel();
panel3.setBackground(Color.gray);
panel4 = new JPanel();
panel4.setBackground(Color.blue);
panel5 = new JPanel();
panel5.setBackground(Color.gray);
panel.add(beverages);
panel.add(a1);panel.add(a2);panel.add(a3);panel.add(a4);panel.add(a5);
panel.add(a6);panel.add(a7);panel.add(a8);panel.add(a9);panel.add(a10);
add(panel);
panel2.add(snacks);
panel2.add(b1);panel2.add(b2);panel2.add(b3);panel2.add(b4);panel2.add(b5);
panel2.add(b6);panel2.add(b7);panel2.add(b8);panel2.add(b9);panel2.add(b10);
add(panel2);
panel3.add(burger);
panel3.add(c1);panel3.add(c2);panel3.add(c3);panel3.add(c4);panel3.add(c5);
panel3.add(c6);panel3.add(c7);panel3.add(c8);panel3.add(c9);panel3.add(c10);
add(panel3);
panel4.add(dessert);
panel4.add(d1);panel4.add(d2);panel4.add(d3);panel4.add(d4);panel4.add(d5);
panel4.add(d6);panel4.add(d7);panel4.add(d8);panel4.add(d9);panel4.add(d10);
add(panel4);
panel5.add(total);panel5.add(compute);panel5.add(exit);
add(panel5);
setLayout(new GridLayout(1,5,0,0));
pack();
setVisible(true);
setSize(550,400);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Restaurant Menu");
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JLabel;
import javax.swing.border.EmptyBorder;
public class Main {
public static void main(String[] args) {
new Main();
}
public Main() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
Menu beverageMenu = new Menu("Beverages", Arrays.asList(new MenuItem[] {
new MenuItem("Coca-Coloa", 1),
new MenuItem("Mountain Dew", 1),
new MenuItem("Rootbeer", 1),
new MenuItem("Fruitsoda", 1),
new MenuItem("Royal", 1),
new MenuItem("C2", 1),
new MenuItem("Mango Shake", 1),
new MenuItem("Orange Juice", 1),
new MenuItem("Water", 1),
new MenuItem("Jack Daniels", 1),
}));
Menu snacksMenu = new Menu("Snacks", Arrays.asList(new MenuItem[] {
new MenuItem("Popcorn", 1),
new MenuItem("Potato chips", 1),
new MenuItem("Fries", 1),
new MenuItem("Chips 4", 1),
new MenuItem("Yogurt 5", 1),
new MenuItem("String chees 6", 1),
new MenuItem("Cereal 7", 1),
new MenuItem("Granola bars 8", 1),
new MenuItem("Gummy bears 9", 1),
new MenuItem("Pretzels 10", 1),
}));
Menu burgerMenu = new Menu("Burgers", Arrays.asList(new MenuItem[] {
new MenuItem("Double pattey burger", 1),
new MenuItem("Cheese burger 2", 1),
new MenuItem("Baacon burger", 1),
new MenuItem("Cheese & bacon burger", 1),
new MenuItem("Mushroom burger", 1),
new MenuItem("Pepperoni burger", 1),
new MenuItem("Quater-pound burger", 1),
new MenuItem("Spicy burger", 1),
new MenuItem("Chicken burger", 1),
new MenuItem("Pizza burger", 1),
}));
Menu dessertMenu = new Menu("Deserts", Arrays.asList(new MenuItem[] {
new MenuItem("Cacke", 1),
new MenuItem("Ice cream", 1),
new MenuItem("Cookies", 1),
new MenuItem("Lech flan", 1),
new MenuItem("Ube", 1),
new MenuItem("Mango graham", 1),
new MenuItem("Macaroons", 1),
new MenuItem("Brownies", 1),
new MenuItem("Pudding", 1),
new MenuItem("Meringue", 1),
}));
List<Menu> menus = new ArrayList<>(Arrays.asList(new Menu[] {
beverageMenu, snacksMenu, burgerMenu, dessertMenu
}));
JFrame frame = new JFrame();
frame.add(new MainPane(menus));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class MenuItem {
private String description;
private double price;
public MenuItem(String description, double price) {
this.description = description;
this.price = price;
}
public String getDescription() {
return description;
}
public double getPrice() {
return price;
}
}
public class Menu {
private String title;
private List<MenuItem> items;
public Menu(String title, List<MenuItem> items) {
this.title = title;
this.items = items;
}
public List<MenuItem> getItems() {
return items;
}
public String getTitle() {
return title;
}
}
public class MainPane extends JPanel {
public MainPane(List<Menu> menus) {
setBorder(new EmptyBorder(4, 4, 4, 4));
setLayout(new GridLayout(1, -1, 4, 0));
for (int index = 0; index < menus.size(); index ) {
Color backgroundColor = index % 2 == 0 ? Color.GRAY : Color.BLUE;
MenuPane menuPane = new MenuPane(menus.get(index));
menuPane.setBackground(backgroundColor);
add(menuPane);
}
Color backgroundColor = menus.size() % 2 == 0 ? Color.GRAY : Color.BLUE;
JPanel actionsPane = new JPanel(new GridBagLayout());
actionsPane.setBackground(backgroundColor);
GridBagConstraints actionGBC = new GridBagConstraints();
actionGBC.gridwidth = GridBagConstraints.REMAINDER;
actionsPane.add(new JLabel("Total: $0.00"), actionGBC);
actionsPane.add(new JButton("Compute"), actionGBC);
actionsPane.add(new JButton("Exit"), actionGBC);
actionGBC.weighty = 1;
actionsPane.add(new JLabel(), actionGBC);
add(actionsPane);
}
}
public class MenuPane extends JPanel {
public MenuPane(Menu menu) {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = gbc.REMAINDER;
add(new JLabel(menu.getTitle()), gbc);
for (MenuItem menuItem : menu.getItems()) {
JCheckBox cb = new JCheckBox(menuItem.getDescription());
add(cb, gbc);
}
gbc.weighty = 1;
add(new JLabel(), gbc);
}
}
}
See Laying Out Components Within a Container for more details