我正在为课程编写一个程序，而且我已经完成了所有这些程序，但有一部分让我很困惑。
我必须创建一个地板系统，人们可以选择地板类型，输入地板的长度和宽度，然后计算并生成订单摘要。
现在，我能够得到所有这些，但计算正确（我甚至没有开始使用数据库连接。）
我的教授对她的指示极其模糊，甚至对她的问题的答案都是模糊的，所以作为最后的努力，我想我会在这里尝试。
我不能为我的生活弄明白所以任何帮助都非常感激。
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class FloorMart
{
private static JFrame frame = null;
private static Integer cost;
private static String floorSize;
private static String floorType;
private double floorLength;
private double floorWidth;
public static void main(String[] args)
{
frame = new JFrame("FloorMart");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(320, 300);
JTabbedPane tPane = new JTabbedPane();
JPanel panel1 = new JPanel();
panel1.setLayout(new FlowLayout());
panel1.setPreferredSize(new Dimension(200, 200));
JLabel jLabel = new JLabel();
jLabel.setText("Welcome to the FloorMart ordering system! ");
panel1.add(jLabel);
JLabel jLabel1 = new JLabel();
jLabel1.setText("Enter your Name: ");
panel1.add(jLabel1);
JTextField text1 = new JTextField(10);
panel1.add(text1);
JLabel jLabel2 = new JLabel();
jLabel2.setText("Enter your Pnone Number: ");
panel1.add(jLabel2);
JTextField text2 = new JTextField(10);
panel1.add(text2);
tPane.addTab("Customer", panel1);
JPanel panel2 = new JPanel();
panel2.setLayout(new FlowLayout());
panel2.setPreferredSize(new Dimension(200, 200));
jLabel = new JLabel();
jLabel.setText("Floor Type? ");
panel2.add(jLabel);
ButtonGroup group = new ButtonGroup();
JRadioButton RadioButton = new JRadioButton("Carpet - $10 per sq ft", true);
panel2.add(RadioButton);
group.add(RadioButton);
JRadioButton RadioButton1 = new JRadioButton("Hardwood - $20 per sq ft");
panel2.add(RadioButton1);
group.add(RadioButton1);
tPane.addTab("Floor Type", panel2);
JPanel panel3 = new JPanel();
panel3.setLayout(new FlowLayout());
panel3.setPreferredSize(new Dimension(200, 200));
jLabel = new JLabel();
jLabel.setText("Enter the length and width of your floor! ");
panel3.add(jLabel);
JLabel jLabel3 = new JLabel();
jLabel3.setText("Enter the floor length: ");
panel3.add(jLabel3);
JTextField length = new JTextField(10);
panel3.add(length);
//length.setText(cost.toString()); //
JLabel jLabel4 = new JLabel();
jLabel4.setText("Enter the floor width: ");
panel3.add(jLabel4);
JTextField width = new JTextField(10);
panel3.add(width);
//width.setText(cost.toString()); //
tPane.addTab("Floor Size", panel3);
JPanel panel4 = new JPanel();
panel4.setLayout(new FlowLayout());
panel4.setPreferredSize(new Dimension(200, 200));
jLabel = new JLabel();
jLabel.setText("Total Cost: ");
panel4.add(jLabel);
JTextField text3 = new JTextField(10);
panel4.add(text3);
JButton button = new JButton("Order Summary");
button.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
JPanel panelNew = new JPanel();
panelNew.setLayout(new BoxLayout(panelNew, BoxLayout.Y_AXIS));
JLabel jLabeln = new JLabel("Order Summary");
JLabel jLabeln1 = new JLabel("Customer Name: " + text1.getText());
JLabel jLabeln2 = new JLabel("Phone Number: " + text2.getText());
JLabel jLabeln3 = new JLabel("Floor Type: " + floorType);
JLabel jLabeln4 = new JLabel("Floor Area: " + floorSize);
JLabel jLabeln5 = new JLabel("Total: $" + new Double(cost) + "0");
JLabel jLabeln6 = new JLabel("Thank you for shopping at FloorMart!");
panelNew.add(jLabeln);
panelNew.add(jLabeln1);
panelNew.add(jLabeln2);
panelNew.add(jLabeln3);
panelNew.add(jLabeln4);
panelNew.add(jLabeln5);
panelNew.add(jLabeln6);
frame.invalidate();
frame.remove(panel1);frame.remove(panel2);frame.remove(panel3);
frame.remove(panel4);
frame.remove(tPane);
frame.add(panelNew);
frame.revalidate();
frame.repaint();
}
});
panel4.add(button);
tPane.addTab("Total", panel4);
ChangeListener changeListener= new ChangeListener()
{
public void stateChanged(ChangeEvent changeEvent)
{
JTabbedPane sourceTabbedPane = (JTabbedPane) changeEvent.getSource();
int index = sourceTabbedPane.getSelectedIndex();
if(index == 2)
{
double floorLength = Double.parseDouble(length.getText());
double floorWidth = Double.parseDouble(width.getText());
floorSize = floorLength * floorWidth;
if(RadioButton.isSelected())
{
cost = 10; //per sq ft
floorType = RadioButton.getText();
}
else if(RadioButton1.isSelected())
{
cost = 20; //per sq ft
floorType = RadioButton1.getText();
}
text3.setText(cost.toString());
}
}
};
tPane.addChangeListener(changeListener);
frame.add(tPane);
frame.setVisible(true);
}
}
答案 0 :(得分：0)
我可以看到两个需要改变的基本内容：
一个。这不编译（floorSize应该是double）
String floorSize;
double floorLength = Double.parseDouble(length.getText());
double floorWidth = Double.parseDouble(width.getText());
floorSize = floorLength * floorWidth;
湾不应由ChangeListener触发floorSize的计算（这会导致计算在输入值之前完成）。 使用＆＃34;订单摘要＆＃34; JButton触发计算。
这是代码的工作版本。看我的评论：
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
public class FloorMart
{
private static JFrame frame = null;
private static Integer cost; //better use int
//////////////////////////////////////
//changed from string to double
private static double floorSize;
////////////////////////////////////
private static String floorType;
private double floorLength;
private double floorWidth;
public static void main(String[] args)
{
frame = new JFrame("FloorMart");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(320, 300);
JTabbedPane tPane = new JTabbedPane();
JPanel panel1 = new JPanel();
panel1.setLayout(new FlowLayout());
panel1.setPreferredSize(new Dimension(200, 200));
JLabel jLabel = new JLabel();
jLabel.setText("Welcome to the FloorMart ordering system! ");
panel1.add(jLabel);
JLabel jLabel1 = new JLabel();
jLabel1.setText("Enter your Name: ");
panel1.add(jLabel1);
JTextField text1 = new JTextField(10);
panel1.add(text1);
JLabel jLabel2 = new JLabel();
jLabel2.setText("Enter your Pnone Number: ");
panel1.add(jLabel2);
JTextField text2 = new JTextField(10);
panel1.add(text2);
tPane.addTab("Customer", panel1);
JPanel panel2 = new JPanel();
panel2.setLayout(new FlowLayout());
panel2.setPreferredSize(new Dimension(200, 200));
jLabel = new JLabel();
jLabel.setText("Floor Type? ");
panel2.add(jLabel);
ButtonGroup group = new ButtonGroup();
JRadioButton RadioButton = new JRadioButton("Carpet - $10 per sq ft", true);
panel2.add(RadioButton);
group.add(RadioButton);
JRadioButton RadioButton1 = new JRadioButton("Hardwood - $20 per sq ft");
panel2.add(RadioButton1);
group.add(RadioButton1);
tPane.addTab("Floor Type", panel2);
JPanel panel3 = new JPanel();
panel3.setLayout(new FlowLayout());
panel3.setPreferredSize(new Dimension(200, 200));
jLabel = new JLabel();
jLabel.setText("Enter the length and width of your floor! ");
panel3.add(jLabel);
JLabel jLabel3 = new JLabel();
jLabel3.setText("Enter the floor length: ");
panel3.add(jLabel3);
JTextField length = new JTextField(10);
panel3.add(length);
//length.setText(cost.toString()); //
JLabel jLabel4 = new JLabel();
jLabel4.setText("Enter the floor width: ");
panel3.add(jLabel4);
JTextField width = new JTextField(10);
panel3.add(width);
//width.setText(cost.toString()); //
tPane.addTab("Floor Size", panel3);
JPanel panel4 = new JPanel();
panel4.setLayout(new FlowLayout());
panel4.setPreferredSize(new Dimension(200, 200));
jLabel = new JLabel();
jLabel.setText("Total Cost: ");
panel4.add(jLabel);
JTextField text3 = new JTextField(10);
panel4.add(text3);
JButton button = new JButton("Order Summary");
button.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
//////////////////////////////////////////////////////////////
//calculation moved to here
double floorLength = Double.parseDouble(length.getText());
double floorWidth = Double.parseDouble(width.getText());
floorSize = floorLength * floorWidth;
if(RadioButton.isSelected())
{
cost = 10; //per sq ft
floorType = RadioButton.getText();
}
else if(RadioButton1.isSelected())
{
cost = 20; //per sq ft
floorType = RadioButton1.getText();
}
text3.setText(cost.toString());
//////////////////////////////////////////////////////////////
JPanel panelNew = new JPanel();
panelNew.setLayout(new BoxLayout(panelNew, BoxLayout.Y_AXIS));
JLabel jLabeln = new JLabel("Order Summary");
JLabel jLabeln1 = new JLabel("Customer Name: " + text1.getText());
JLabel jLabeln2 = new JLabel("Phone Number: " + text2.getText());
JLabel jLabeln3 = new JLabel("Floor Type: " + floorType);
JLabel jLabeln4 = new JLabel("Floor Area: " + floorSize);
///////////////////////////////////////////////////////////////////////////
// changed JLabel jLabeln5 = new JLabel("Total: $" + new Double(cost*floorSize) + "0");
//to:
JLabel jLabeln5 = new JLabel("Total: $" + new Double(cost*floorSize) + "0");
///////////////////////////////////////////////////////////////////////////
JLabel jLabeln6 = new JLabel("Thank you for shopping at FloorMart!");
panelNew.add(jLabeln);
panelNew.add(jLabeln1);
panelNew.add(jLabeln2);
panelNew.add(jLabeln3);
panelNew.add(jLabeln4);
panelNew.add(jLabeln5);
panelNew.add(jLabeln6);
frame.invalidate();
frame.remove(panel1);frame.remove(panel2);frame.remove(panel3);
frame.remove(panel4);
frame.remove(tPane);
frame.add(panelNew);
frame.revalidate();
frame.repaint();
}
});
panel4.add(button);
tPane.addTab("Total", panel4);
/////////////////////////////////
//removed ChangeListener
////////////////////////////////
frame.add(tPane);
frame.setVisible(true);
}
}