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我在CS12類中創建了一個程序，可以將JRadioButon/JCheckBox/JComboBox組合在一起。JComboBox問題
截至目前我很困惑JComboBox，我不明白我在ActionListener部分丟失了什麼。
首先，我不能從第三列（顏色&內部）中選擇任何選項，它不會顯示在同一列中創建的標籤上。
其次，在我從第四列中選擇省之前，我看不到在第二列中創建的JCheckBoxes的值。
會接受任何建議，謝謝。 //請原諒我的英語，我不是母語的人。
import javax.swing。*;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.*;
public class VolvoStore extends JFrame implements ItemListener {
private JButton btnCheckout;
private JButton btnClear;
private JButton btnExit;
private JButton btnAbout;
private JLabel txt1 = new JLabel();// total
private JLabel txt2 = new JLabel();
private JLabel txt3 = new JLabel();
private JLabel txt4 = new JLabel();
private JLabel txt5 = new JLabel();
private JLabel txt6 = new JLabel();
private JLabel txt7 = new JLabel();
private JLabel txt8 = new JLabel();
Double m;
Double k;
JCheckBox chk = new JCheckBox("Climate Package [Add $1,350.00]");
JCheckBox chk1 = new JCheckBox("Technology Package [Add $1,500.00]");
JCheckBox chk2 = new JCheckBox("Inscription Package [Add $2,600.00]");
JCheckBox chk3 = new JCheckBox(
"19\" BOR Diamond Cut Alloy Wheels [Add $1,250.00]");
JCheckBox chk4 = new JCheckBox(
"Blind Spot Information System [Add $800.00]");
JCheckBox chk5 = new JCheckBox(
"Active Dual Xenon Headlights with Washers [Add $1,000.00]");
JCheckBox chk6 = new JCheckBox("Front and Rear Park Assist [Add $600.00]");
JCheckBox chk7 = new JCheckBox(
"Apple CarPlay System + Bose Sound System [Add $2400.00]");
private JRadioButton rb1, rb2, rb3, rb4;
private JLabel label = new JLabel();
private JLabel label1 = new JLabel();
private JLabel label2 = new JLabel();
private JLabel label3 = new JLabel();
private JLabel label4 = new JLabel();
private JLabel label5 = new JLabel();
private JLabel label6 = new JLabel();
private JLabel label7 = new JLabel();
private JLabel label11 = new JLabel();
private JLabel label12 = new JLabel();
private JLabel label13 = new JLabel();
private JLabel label14 = new JLabel();
private JLabel label15 = new JLabel();
private JLabel label16 = new JLabel();
private JLabel label17 = new JLabel();
private JLabel label18 = new JLabel();
private JLabel label19 = new JLabel();
private JLabel label20 = new JLabel();
private JLabel label21 = new JLabel();
private JLabel label111 = new JLabel();
private JLabel label112 = new JLabel();
private JLabel label113 = new JLabel();
private JLabel label114 = new JLabel();
private JLabel tx = new JLabel();
private JLabel tx2 = new JLabel();
private JLabel tx3 = new JLabel();
private JLabel tx4 = new JLabel();
private JLabel tx4a = new JLabel();
private JLabel tx5 = new JLabel();
private JLabel tx6 = new JLabel();
private JLabel tx7 = new JLabel();
private JLabel tx71 = new JLabel();
private JLabel tx72 = new JLabel();
private JLabel tx73 = new JLabel();
double total;
double total1;
JComboBox<String> cboAColor;
JComboBox<String> cboBColor;
JComboBox<String> cboCColor;
JComboBox<String> cboProvinces;
int a = 0;
int b = 0;
int c = 0;
int d = 0;
int d1 = 0;
int f = 0;
int g = 0;
int h = 0;
JPanel panel = new JPanel();
private JTextField text1 = new JTextField("", 16);// total bill
public static void main(String[] args) {
new VolvoStore();
}
public VolvoStore() {
// OK Button
btnCheckout = new JButton("Checkout");
btnCheckout.setToolTipText("Checkout");
btnCheckout.setBounds(1315, 150, 120, 40);
btnCheckout.setMnemonic(KeyEvent.VK_C);
panel.setLayout(null);
btnCheckout.setBorderPainted(false);
panel.add(btnCheckout);
// Clear
btnClear = new JButton("Clear");
btnClear.setToolTipText("Clear");
btnClear.setBounds(1315, 200, 120, 40);
btnClear.setMnemonic(KeyEvent.VK_C);
btnClear.setBorderPainted(false);
panel.add(btnClear);
// EXIT
btnExit = new JButton("Exit");
btnExit.setToolTipText("Exit");
btnExit.setBounds(1315, 250, 120, 40);
btnExit.setMnemonic(KeyEvent.VK_C);
panel.setLayout(null);
btnExit.setBorderPainted(false);
panel.add(btnExit);
// ABOUT
btnAbout = new JButton("About");
btnAbout.setToolTipText("About");
btnAbout.setBounds(1315, 300, 120, 40);
btnAbout.setMnemonic(KeyEvent.VK_C);
panel.setLayout(null);
btnAbout.setBorderPainted(false);
panel.add(btnAbout);
//user input
panel.add(text1);
text1.setBounds(1275, 775, 200, 35);
text1.setHorizontalAlignment(JLabel.CENTER);
//total MSRP
txt1.setText("0.0");
txt1.setBounds(1300, 575, 140, 40);
panel.add(txt1);
txt1.setHorizontalAlignment(JLabel.CENTER);
// 1st column
txt2.setText("0.0");
txt2.setBounds(155, 875, 140, 40);
panel.add(txt2);
txt2.setHorizontalAlignment(JLabel.CENTER);
//Second Column
txt3.setText("0.0");
txt3.setBounds(575, 875, 140, 40);
panel.add(txt3);
txt3.setHorizontalAlignment(JLabel.CENTER);
// total Selling Price
txt4.setText("0.0");
txt4.setBounds(1300, 875, 140, 40);
panel.add(txt4);
txt4.setHorizontalAlignment(JLabel.CENTER);
//Freight & Dealer Prep
txt5.setText("10.0");
txt5.setBounds(1300, 675, 140, 40);
panel.add(txt5);
txt5.setHorizontalAlignment(JLabel.CENTER);
//third column
txt6.setText("0.0");
txt6.setBounds(965, 875, 140, 40);
panel.add(txt6);
txt6.setHorizontalAlignment(JLabel.CENTER);
//check buttons in a second column + radio button and images from the first column
panel.add(chk);
panel.add(chk1);
panel.add(chk2);
panel.add(chk3);
panel.add(chk4);
panel.add(chk5);
panel.add(chk6);
panel.add(chk7);
chk.setBounds(450, 50, 540, 40);
chk1.setBounds(450, 150, 540, 40);
chk2.setBounds(450, 250, 540, 40);
chk3.setBounds(450, 350, 540, 40);
chk4.setBounds(450, 450, 540, 40);
chk5.setBounds(450, 550, 540, 40);
chk6.setBounds(450, 650, 540, 40);
chk7.setBounds(450, 750, 540, 40);
panel.setLayout(null);
btnCheckout.addActionListener(new ButtonListener());
btnClear.addActionListener(new ButtonListener());
btnAbout.addActionListener(new ButtonListener());
btnExit.addActionListener(new ButtonListener());
chk.addItemListener(this);
chk1.addItemListener(this);
chk2.addItemListener(this);
chk3.addItemListener(this);
chk4.addItemListener(this);
chk5.addItemListener(this);
chk6.addItemListener(this);
chk7.addItemListener(this);
// images
ImageIcon imgThisImg = new ImageIcon("S80.png");
label1.setIcon(imgThisImg);
label1.setBounds(25, 450, 550, 590);
panel.add(label1);
label1.setOpaque(false);
ImageIcon imgThisImg1 = new ImageIcon("XC90.png");
label2.setIcon(imgThisImg1);
label2.setBounds(25, -50, 680, 390);
panel.add(label2);
label2.setOpaque(false);
ImageIcon imgThisImg2 = new ImageIcon("XC70.png");
label3.setIcon(imgThisImg2);
label3.setBounds(25, 150, 680, 390);
panel.add(label3);
label3.setOpaque(false);
ImageIcon imgThisImg3 = new ImageIcon("XC60.png");
label4.setIcon(imgThisImg3);
label4.setBounds(25, 350, 680, 390);
panel.add(label4);
label4.setOpaque(false);
ImageIcon imgThisImg4 = new ImageIcon("Volvo.jpeg");
label5.setIcon(imgThisImg4);
label5.setBounds(-10, -170, 680, 390);
panel.add(label5);
label5.setOpaque(false);
ImageIcon imgThisImg5 = new ImageIcon("012.png");
label6.setIcon(imgThisImg5);
label6.setBounds(1275, 290, 680, 390);
panel.add(label6);
label6.setOpaque(false);
ImageIcon imgThisImg6 = new ImageIcon("sun.png");
label7.setIcon(imgThisImg6);
label7.setBounds(1275, 220, 680, 390);
panel.add(label7);
label7.setOpaque(false);
// Create radio buttons
rb1 = new JRadioButton("Volvo XC90");
rb2 = new JRadioButton("Volvo XC70");
rb3 = new JRadioButton("Volvo XC60");
rb4 = new JRadioButton("Vovlo S80");
// Create button group for soup options
ButtonGroup group = new ButtonGroup();
group.add(rb1);
group.add(rb2);
group.add(rb3);
group.add(rb4);
// Create soup panel
rb1.setBounds(0, 200, 120, 40);
rb2.setBounds(0, 400, 120, 40);
rb3.setBounds(0, 600, 120, 40);
rb4.setBounds(0, 800, 120, 40);
//panel.add(label);
//label.setBounds(200, -150, 550, 590);
rb1.addItemListener(this);
rb2.addItemListener(this);
rb3.addItemListener(this);
rb4.addItemListener(this);
// text at the top and side
Font a = new Font("Greek", Font.PLAIN, 20);
tx.setText("Step 1: Model");
tx.setBounds(125, 0, 300, 40);
panel.add(tx);
tx2.setText("Step 2: Packages & Options ");
tx2.setBounds(520, 0, 300, 40);
panel.add(tx2);
tx3.setText("Step 3: Paint & Interior");
tx3.setBounds(925, 0, 300, 40);
panel.add(tx3);
tx4.setText("Step 4: Final Payment");
tx4.setBounds(1275, 0, 300, 40);
panel.add(tx4);
tx4a.setText("Total MSRP");
tx4a.setBounds(1275, 525, 300, 40);
panel.add(tx4a);
tx5.setText("Freight & Dealer Preparation");
tx5.setBounds(1275, 625, 300, 40);
panel.add(tx5);
tx6.setText("Trade-in and Down Payment ");
tx6.setBounds(1275, 725, 300, 40);
panel.add(tx6);
tx7.setText("Total Selling Price");
tx7.setBounds(1275, 825, 300, 40);
panel.add(tx7);
tx71.setText("Select Upholstery");
tx71.setBounds(985, 350, 300, 40);
panel.add(tx71);
tx72.setText("Select Trim");
tx72.setBounds(1000, 550, 300, 40);
panel.add(tx72);
tx73.setText("Select Color");
tx73.setBounds(1000, 150, 300, 40);
panel.add(tx73);
tx.setFont(a);
tx2.setFont(a);
tx3.setFont(a);
tx4.setFont(a);
//
// Create main panel
panel.setLayout(null);
panel.add(rb1);
panel.add(rb2);
panel.add(rb3);
panel.add(rb4);
//Jcombobox at third and fourth columns
String[] aa = { "Black Sapphire" ,"Electric Silver", "Passion Red [add $200.00]",
"Crystal White Pearl [add $200.00]" };
cboAColor = new JComboBox<String>(aa);
panel.add(cboAColor);
cboAColor.setBounds(940, 100, 200, 200);
String[] bb = { "Black/Black ARTICO Leather, without additional charge",
"Alpaca Grey/Alpaca Grey ARTICO Leather, without additional charge",
"Almond Beige/Cashmere Beige ARTICO Leather [add $350.00]" };
cboBColor = new JComboBox<String>(bb);
panel.add(cboBColor);
cboBColor.setBounds(940, 300, 200, 200);
String[] cc = { "Burl Walnut Wood, without additional charge", "Dark Ash Wood, without additional charge", "Aluminum[add $200]" };
cboCColor = new JComboBox<String>(cc);
panel.add(cboCColor);
cboCColor.setBounds(940, 500, 200, 200);
String[] dd = { "Select Province", "Ontario", "Quebeck", "Nova Scotia",
"New Brunswick", "Manitoba", "British Colombia",
"Prince Edward Island", "Saskatchewan", "Alberta",
"Newfoundland and Labrador" };
cboProvinces = new JComboBox<String>(dd);
panel.add(cboProvinces);
cboProvinces.setBounds(1275, 000, 200, 200);
cboAColor.addItemListener(this);
cboBColor.addItemListener(this);
cboCColor.addItemListener(this);
cboProvinces.addItemListener(this);
// borders ...
panel.add(label11);
label11.setBackground(Color.white);// set background color
label11.setBorder(BorderFactory.createLineBorder(Color.black));// set //
// color
label11.setBounds(125, 875, 200, 35);// bounds and location
label11.setOpaque(false);
// create black border for a Clear Button
panel.add(label12);
label12.setOpaque(false);
label12.setBackground(Color.white);// set background color
label12.setBorder(BorderFactory.createLineBorder(Color.black));// set //
// color
label12.setBounds(550, 875, 200, 35);// bounds and location
// create black border for a Clear Button
panel.add(label13);
label13.setOpaque(false);
label13.setBackground(Color.white);// set background color
label13.setBorder(BorderFactory.createLineBorder(Color.black));// set
// color
label13.setBounds(940, 875, 200, 35);// bounds and location
panel.add(label14);
label14.setOpaque(false);
label14.setBackground(Color.white);// set background color
label14.setBorder(BorderFactory.createLineBorder(Color.black));// set //
// color
label14.setBounds(1275, 875, 200, 35);// bounds and location
panel.add(label15);
label15.setOpaque(false);
label15.setBackground(Color.white);// set background color
label15.setBorder(BorderFactory.createLineBorder(Color.black));// set //
// color
label15.setBounds(1275, 775, 200, 35);// bounds and location
panel.add(label16);
label16.setOpaque(false);
label16.setBackground(Color.white);// set background color
label16.setBorder(BorderFactory.createLineBorder(Color.black));// set //
// color
label16.setBounds(1275, 675, 200, 35);// bounds and location
panel.add(label17);
label17.setOpaque(false);
label17.setBackground(Color.white);// set background color
label17.setBorder(BorderFactory.createLineBorder(Color.black));// set //
// color
label17.setBounds(1275, 575, 200, 35);// bounds and location
panel.add(label18);
label18.setOpaque(false);
label18.setBackground(Color.white);// set background color
label18.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));// set
// //
// color
label18.setBounds(0, -100, 445, 1100);// bounds and location
panel.add(label19);
label19.setOpaque(false);
label19.setBackground(Color.white);// set background color
label19.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));// set
// //
// color
label19.setBounds(445, -100, 415, 1100);// bounds and location
panel.add(label20);
label20.setOpaque(false);
label20.setBackground(Color.white);// set background color
label20.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));// set
// //
// color
label20.setBounds(860, -100, 360, 1100);// bounds and location
panel.add(label21);
label21.setOpaque(false);
label21.setBackground(Color.white);// set background color
label21.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));// set
// //
// color
label21.setBounds(1220, -100, 360, 1100);// bounds and location
panel.add(label111);
label111.setBackground(Color.white);// set background color
label111.setBorder(BorderFactory.createLineBorder(Color.black));// set
// //
// color
label111.setBounds(1275, 150, 200, 35);// bounds and location
label111.setOpaque(false);
panel.add(label112);
label112.setBackground(Color.white);// set background color
label112.setBorder(BorderFactory.createLineBorder(Color.black));// set
// //
// color
label112.setBounds(1275, 200, 200, 35);// bounds and location
label112.setOpaque(false);
panel.add(label113);
label113.setBackground(Color.white);// set background color
label113.setBorder(BorderFactory.createLineBorder(Color.black));// set
// //
// color
label113.setBounds(1275, 250, 200, 35);// bounds and location
label113.setOpaque(false);
panel.add(label114);
label114.setBackground(Color.white);// set background color
label114.setBorder(BorderFactory.createLineBorder(Color.black));// set
// //
// color
label114.setBounds(1275, 300, 200, 35);// bounds and location
label114.setOpaque(false);
//
// frame
setContentPane(panel);
setSize(1520, 950);
setTitle("Volvo Store");
getContentPane().setBackground(new Color(255, 255, 255));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setResizable(false);
validate();
}
private class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (e.getSource() == btnCheckout) {
} else if (e.getSource() == btnClear) {
txt1.setText("0.0");
txt2.setText("0.0");
txt3.setText("0.0");
txt4.setText("0.0");
txt5.setText("0.0");
txt6.setText("0.0");
txt7.setText("0.0");
chk7.setSelected(false);
chk6.setSelected(false);
chk5.setSelected(false);
chk4.setSelected(false);
chk3.setSelected(false);
chk2.setSelected(false);
chk1.setSelected(false);
chk.setSelected(false);
} else if (e.getSource() == btnAbout) {
JOptionPane.showMessageDialog(null,
"Made by Evgeny Shumilov - 2014", "About",
JOptionPane.INFORMATION_MESSAGE);
} else if (e.getSource() == btnExit) {
}
}
}
public void itemStateChanged(ItemEvent e) {
double a = 0;
double b = 0;
double c = 0;
double d = 0;
double d1 = 0;
double f = 0;
double g = 0;
double h = 0;
double a1 = 0;
double a2 = 0;
double a3 = 0;
double a4 = 0;
double b1 = 0;
double b2 = 0;
double b3 = 0;
double c1 = 0;
double c2 = 0;
double c3 = 0;
//radiobutton
if (e.getSource() == rb1) {
txt1.setText("50800.0");
txt2.setText("50800.0");
panel.add(txt1);
panel.add(txt2);
m = Double.parseDouble(txt1.getText());
txt1.setHorizontalAlignment(JLabel.CENTER);
}
else if (rb2.isSelected()) {
txt1.setText("42100.0");
txt2.setText("42100.0");
panel.add(txt1);
panel.add(txt2);
m = Double.parseDouble(txt1.getText());
txt1.setHorizontalAlignment(JLabel.CENTER);
} else if (rb3.isSelected()) {
txt1.setText("40950.0");
txt2.setText("40950.0");
panel.add(txt1);
panel.add(txt2);
m = Double.parseDouble(txt1.getText());
txt1.setHorizontalAlignment(JLabel.CENTER);
} else if (rb4.isSelected()) {
txt1.setText("49000.0");
txt2.setText("49000.0");
panel.add(txt1);
panel.add(txt2);
m = Double.parseDouble(txt1.getText());
txt1.setHorizontalAlignment(JLabel.CENTER);
}
if (chk.isSelected()) {
a = 1350;
}
if (chk1.isSelected()) {
b = 1500;
}
if (chk2.isSelected()) {
c = 2600;
}
if (chk3.isSelected()) {
d = 1250;
}
if (chk4.isSelected()) {
d1 = 800;
}
if (chk5.isSelected()) {
f = 1000;
}
if (chk6.isSelected()) {
g = 600;
}
if (chk7.isSelected()) {
h = 2400;
}
//p
if (e.getSource() == cboProvinces) {
String one = (String) cboProvinces.getSelectedItem();
if (one.equals("Select Province")) {
txt5.setText("0.0");
panel.add(txt5);
} else if (one.equals("Ontario")) {
txt5.setText("1934.0");
panel.add(txt5);
k = Double.parseDouble(txt5.getText());
} else if (one.equals("Quebeck")) {
txt5.setText("2200.0");
panel.add(txt5);
k = Double.parseDouble(txt5.getText());
} else if (one.equals("Nova Scotia")) {
txt5.setText("1800.0");
panel.add(txt5);
k = Double.parseDouble(txt5.getText());
} else if (one.equals("New Brunswick")) {
txt5.setText("1999.0");
panel.add(txt5);
k = Double.parseDouble(txt5.getText());
} else if (one.equals("Manitoba")) {
txt5.setText("2100.0");
panel.add(txt5);
k = Double.parseDouble(txt5.getText());
} else if (one.equals("British Colombia")) {
txt5.setText("1300.0");
panel.add(txt5);
k = Double.parseDouble(txt5.getText());
} else if (one.equals("Prince Edward Island")) {
txt5.setText("2335.0");
panel.add(txt5);
k = Double.parseDouble(txt5.getText());
} else if (one.equals("Saskatchewan")) {
txt5.setText("2120.0");
panel.add(txt5);
k = Double.parseDouble(txt5.getText());
} else if (one.equals("Alberta")) {
txt5.setText("1670.0");
panel.add(txt5);
k = Double.parseDouble(txt5.getText());
} else if (one.equals("Newfoundland and Labrador")) {
txt5.setText("3200.0");
panel.add(txt5);
k = Double.parseDouble(txt5.getText());
}
}
//color
if (e.getSource() == cboAColor) {
String one = (String) cboAColor.getSelectedItem();
if (one.equals("Passion Red")) {
a1 = 200;
txt6.setText("200.0");
panel.add(txt6);
} else if (one.equals("Black Sapphire")) {
a2 = 0;
txt6.setText("0.0");
panel.add(txt6);
} else if (one.equals("Crystal White Pearl")) {
a3 = 200.0;
txt6.setText("200.0");
panel.add(txt6);
} else if (one.equals("Electric Silver")) {
a4 = 0;
txt6.setText("0.0");
panel.add(txt6);
}
}
//leather
if (e.getSource() == cboBColor) {
String two = (String) cboBColor.getSelectedItem();
if (two.equals("Black/Black ARTICO Leather")) {
b1 = 0;
txt6.setText("0.0");
panel.add(txt6);
} else if (two.equals("Alpaca Grey/Alpaca Grey ARTICO Leather")) {
b2 = 0;
txt6.setText("0.0");
panel.add(txt6);
} else if (two.equals("Almond Beige/Cashmere Beige ARTICO Leather")) {
b3 = 350;
txt6.setText("350.0");
panel.add(txt6);
}
}
//panel
if (e.getSource() == cboCColor) {
String one1 = (String) cboCColor.getSelectedItem();
if (one1.equals("Aluminum")) {
c1 = 300;
txt6.setText("300.0");
panel.add(txt6);
} else if (one1.equals("Burl Walnut Wood")) {
c2 = 0;
txt6.setText("0.0");
panel.add(txt6);
} else if (one1.equals("Dark Ash Wood")) {
c3 = 0;
txt6.setText("0.0");
panel.add(txt6);
}
}
//Double b1ll = Double.parseDouble(text1.getText());
Double total = m + a + b + c + d + d1 + f + g + h + a1 + a2 + a3 +a4 + b1 + b2 + b3+ c1 + c2 +c3;
Double total1 = a + b + c + d + d1 + f + g + h;
Double totala = a1 + a2 + a3 +a4 + b1 + b2 + b3+ c1 + c2 +c3;
Double FinalC= total + k;// - b1ll ;
String total2 = Double.toString(total);
String total21 = Double.toString(total1);
String totalm = Double.toString(totala);
String Final = Double.toString(FinalC);
txt1.setText(total2);
txt3.setText(total21);
txt6.setText(totalm);
txt4.setText(Final);
validate();
}
}
只見'panel.setLayout （null）;'並停止。努力理解和利用合適的佈局管理器，請參閱[佈置容器中的組件]（http://docs.oracle.com/javase/tutorial/uiswing/layout/index.html）以獲取更多詳細信息。如果我是你的導師，我會失敗誰給我提供了一個解決方案使用'空'佈局 - 但我是古老而憤世嫉俗的...... – MadProgrammer