我正在用GUI制作餐厅菜单程序。
我为其中一个创建了3个jpanels并将背景(color.white(设置为。
但是Java不会显示该背景颜色。
怎么了?
这是我的代码
请不要注意食品的价格和纸牌套。未完成编码。
public class MainDishPanel extends JPanel {
JCheckBox box1 = new JCheckBox("Hamburger 5 dollars"),
box2 = new JCheckBox("Pizza 5 dollars"),
box3 = new JCheckBox("French Hot dog 5 dollars");
MainDishPanel(){
setOpaque(true);
setBackground(Color.white);
setLayout(new GridLayout(3,1));
// setBorder();
add(box1);add(box2);add(box3);
setVisible(true);
}
}
主要方法的类:
import java.awt.BorderLayout;
import javax.swing.*;
import java.util.*;
import java.awt.event.*;
import java.awt.*;
public class RestaurantMenu extends JFrame implements ActionListener{
/* private JPanel maindishPanel= new JPanel(),
dessertPanel = new JPanel(),
drinkPanel = new JPanel(),*/
private JPanel leftPanel = new JPanel(),
rightPanel = new JPanel();
private MainDishPanel maindish = new MainDishPanel();
private DessertPanel dessert = new DessertPanel();
private DrinkPanel drink = new DrinkPanel();
private LinkedList<Double>price = new LinkedList<>();
private JButton left = new JButton("previous"),
right = new JButton("next");
public int page =1;
private JLabel pageLabel = new JLabel(String.valueOf(page)),
foodTypeLabel = new JLabel();
CardLayout cards;
GridBagLayout grid;
RestaurantMenu(){
setTitle("Main Dish");
GridBagConstraints gbc = new GridBagConstraints();
add(foodTypeLabel, BorderLayout.NORTH);
add(pageLabel, BorderLayout.SOUTH);
add(leftPanel, BorderLayout.WEST);
add(rightPanel, BorderLayout.EAST);
add(maindish, BorderLayout.CENTER);
grid = new GridBagLayout();
leftPanel.setLayout(grid); leftPanel.add(left);
rightPanel.setLayout(grid); rightPanel.add(right);
right.addActionListener(this);
left.addActionListener(this);
//cards = new CardLayout();
/*cards = (CardLayout)maindishPanel.getLayout();
cards.show(maindishPanel,"Main Dish");*/
setVisible(true);
setSize(500,500);
setResizable(false);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==right)
cards.next(this);
if(e.getSource()==left)
cards.previous(this);
}
public static void main (String []args){
RestaurantMenu rm = new RestaurantMenu();
}
}
我没有任何错误。背景颜色不会更改为白色。
餐厅男性课程看起来像意大利面条代码或奇怪的东西
因为我与那堂课有很多关系。
在您的Maindishpanel内部,您需要将jCheckbox的背景颜色设置为白色,或者您只需在jCheckbox上的false setopaque
falseimport java.awt.Color;
import java.awt.GridLayout;
import javax.swing.JCheckBox;
import javax.swing.JPanel;
public class MainDishPanel extends JPanel {
JCheckBox box1 = new JCheckBox("Hamburger 5 dollars"), box2 = new JCheckBox("Pizza 5 dollars"),
box3 = new JCheckBox("French Hot dog 5 dollars");
MainDishPanel() {
setOpaque(true);
setBackground(Color.WHITE);
setLayout(new GridLayout(3, 1));
box1.setBackground(Color.WHITE); // or box1.setOpaque(false);
box2.setBackground(Color.WHITE);
box3.setBackground(Color.WHITE);
add(box1);
add(box2);
add(box3);
setVisible(true);
}
}