我正在做这个为公共汽车预留座位的程序。这是一个学校项目。我负责计算费用。例如：我将预订三个座位，因此我将单击我喜欢预订的按钮。文本框应该显示这三个席位的总成本。我制作了这个累加器变量，期望它将保存该交易按下的按钮的总数，这样我就可以轻松地将它乘以价格。
package busreservationproject;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JPanel;
public class ReservationSubClass extends JFrame {
private JLabel A1; private JLabel A2;
private JLabel B1; private JLabel B2;
private JLabel C1; private JLabel C2;
private JLabel D1; private JLabel D2;
private JLabel E1; private JLabel E2;
private JLabel F1; private JLabel F2;
private JLabel G1; private JLabel G2;
private JLabel H1; private JLabel H2;
private JLabel I1; private JLabel I2;
private JLabel J1; private JLabel J2;
private JTextField counter; private JTextField bill;
private JLabel counterLab; private JLabel bLabel;
private JButton r1button; private JButton r11button;
private JButton r2button; private JButton r12button;
private JButton r3button; private JButton r13button;
private JButton r4button; private JButton r14button;
private JButton r5button; private JButton r15button;
private JButton r6button; private JButton r16button;
private JButton r7button; private JButton r17button;
private JButton r8button; private JButton r18button;
private JButton r9button; private JButton r19button;
private JButton r10button; private JButton r20button;
private JPanel contentPane;
private JButton billButton;
public ReservationSubClass()
{
super("Bus Reservation");
String string = "";
contentPane = new JPanel();
contentPane.setLayout(new GridBagLayout());
GridBagConstraints cons = new GridBagConstraints();
add(contentPane);
cons.insets = new Insets (0,0,10,10);
A1 = new JLabel("A1");
A1.setToolTipText("click the button below to reserve this seat");
r1button = new JButton("reserve A1");
cons.gridx = 0;
cons.gridy = 1;
contentPane.add(A1,cons);
cons.gridx = 0;
cons.gridy = 2;
contentPane.add(r1button,cons);
B1 = new JLabel("B1");
B1.setToolTipText("click the button below to reserve this seat");
r2button = new JButton("reserve B1");
cons.gridx = 0;
cons.gridy = 3;
contentPane.add(B1,cons);
cons.gridx = 0;
cons.gridy = 4;
contentPane.add(r2button,cons);
C1 = new JLabel("C1");
C1.setToolTipText("click the button below to reserve this seat");
r3button = new JButton("reserve C1");
cons.gridx = 0;
cons.gridy = 5;
contentPane.add(C1,cons);
cons.gridx = 0;
cons.gridy = 6;
contentPane.add(r3button,cons);
D1 = new JLabel("D1");
D1.setToolTipText("click the button below to reserve this seat");
r4button = new JButton("reserve D1");
cons.gridx = 0;
cons.gridy = 7;
contentPane.add(D1,cons);
cons.gridx = 0;
cons.gridy = 8;
contentPane.add(r4button,cons);
E1 = new JLabel("E1");
E1.setToolTipText("click the button below to reserve this seat");
r5button = new JButton("reserve E1");
cons.gridx = 0;
cons.gridy = 9;
contentPane.add(E1,cons);
cons.gridx = 0;
cons.gridy = 10;
contentPane.add(r5button,cons);
F1 = new JLabel("F1");
F1.setToolTipText("click the button below to reserve this seat");
r6button = new JButton("reserve F1");
cons.gridx = 0;
cons.gridy = 11;
contentPane.add(F1,cons);
cons.gridx = 0;
cons.gridy = 12;
contentPane.add(r6button,cons);
G1 = new JLabel("G1");
G1.setToolTipText("click the button below to reserve this seat");
r7button = new JButton("reserve G1");
cons.gridx = 0;
cons.gridy = 13;
contentPane.add(G1,cons);
cons.gridx = 0;
cons.gridy = 14;
contentPane.add(r7button,cons);
H1 = new JLabel("H1");
H1.setToolTipText("click the button below to reserve this seat");
r8button = new JButton("reserve H1");
cons.gridx = 0;
cons.gridy = 15;
contentPane.add(H1,cons);
cons.gridx = 0;
cons.gridy = 16;
contentPane.add(r8button,cons);
I1 = new JLabel("I1");
I1.setToolTipText("click the button below to reserve this seat");
r9button = new JButton("reserve I1");
cons.gridx = 0;
cons.gridy = 17;
contentPane.add(I1,cons);
cons.gridx = 0;
cons.gridy = 18;
contentPane.add(r9button,cons);
J1 = new JLabel("J1");
J1.setToolTipText("click the button below to reserve this seat");
r10button = new JButton("reserve J1");
cons.gridx = 0;
cons.gridy = 19;
contentPane.add(J1,cons);
cons.gridx = 0;
cons.gridy = 20;
contentPane.add(r10button,cons);
//COL 2
A2 = new JLabel("A2");
A2.setToolTipText("click the button below to reserve this seat");
r11button = new JButton("reserve A2");
cons.gridx = 100;
cons.gridy = 1;
contentPane.add(A2,cons);
cons.gridx = 100;
cons.gridy = 2;
contentPane.add(r11button,cons);
B2 = new JLabel("B2");
B2.setToolTipText("click the button below to reserve this seat");
r12button = new JButton("reserve B2");
cons.gridx = 100;
cons.gridy = 3;
contentPane.add(B2,cons);
cons.gridx = 100;
cons.gridy = 4;
contentPane.add(r12button,cons);
C2 = new JLabel("C2");
C2.setToolTipText("click the button below to reserve this seat");
r13button = new JButton("reserve C2");
cons.gridx = 100;
cons.gridy = 5;
contentPane.add(C2,cons);
cons.gridx = 100;
cons.gridy = 6;
contentPane.add(r13button,cons);
D2 = new JLabel("D2");
D2.setToolTipText("click the button below to reserve this seat");
r14button = new JButton("reserve D2");
cons.gridx = 100;
cons.gridy = 7;
contentPane.add(D2,cons);
cons.gridx = 100;
cons.gridy = 8;
contentPane.add(r14button,cons);
E2 = new JLabel("E2");
E2.setToolTipText("click the button below to reserve this seat");
r15button = new JButton("reserve E2");
cons.gridx = 100;
cons.gridy = 9;
contentPane.add(E2,cons);
cons.gridx = 100;
cons.gridy = 10;
contentPane.add(r15button,cons);
F2 = new JLabel("F2");
F2.setToolTipText("click the button below to reserve this seat");
r16button = new JButton("reserve F2");
cons.gridx = 100;
cons.gridy = 11;
contentPane.add(F2,cons);
cons.gridx = 100;
cons.gridy = 12;
contentPane.add(r16button,cons);
G2 = new JLabel("G2");
G2.setToolTipText("click the button below to reserve this seat");
r17button = new JButton("reserve G2");
cons.gridx = 100;
cons.gridy = 13;
contentPane.add(G2,cons);
cons.gridx = 100;
cons.gridy = 14;
contentPane.add(r17button,cons);
H2 = new JLabel("H2");
H2.setToolTipText("click the button below to reserve this seat");
r18button = new JButton("reserve H2");
cons.gridx = 100;
cons.gridy = 15;
contentPane.add(H2,cons);
cons.gridx = 100;
cons.gridy = 16;
contentPane.add(r18button,cons);
I2 = new JLabel("I2");
I2.setToolTipText("click the button below to reserve this seat");
r19button = new JButton("reserve I2");
cons.gridx = 100;
cons.gridy = 17;
contentPane.add(I2,cons);
cons.gridx = 100;
cons.gridy = 18;
contentPane.add(r19button,cons);
J2 = new JLabel("J2");
J2.setToolTipText("click the button below to reserve this seat");
r20button = new JButton("reserve J2");
cons.gridx = 100;
cons.gridy = 19;
contentPane.add(J2,cons);
cons.gridx = 100;
cons.gridy = 20;
contentPane.add(r20button,cons);
//COUNTER
counterLab = new JLabel("counter");
counter = new JTextField(20);
counter.setEditable(false);
cons.gridx = 300;
cons.gridy = 5;
contentPane.add(counterLab,cons);
cons.gridx = 300;
cons.gridy = 6;
contentPane.add(counter,cons);
bLabel = new JLabel("bill");
bLabel.setToolTipText("enter the bill below");
bill = new JTextField(20);
billButton = new JButton("calculate");
cons.gridx = 300;
cons.gridy = 7;
contentPane.add(bLabel,cons);
cons.gridx = 300;
cons.gridy = 8;
contentPane.add(bill,cons);
cons.gridx = 300;
cons.gridy = 9;
contentPane.add(billButton,cons);
progHandler handler = new progHandler();
r1button.addActionListener(handler); r11button.addActionListener(handler);
r2button.addActionListener(handler); r12button.addActionListener(handler);
r3button.addActionListener(handler); r13button.addActionListener(handler);
r4button.addActionListener(handler); r14button.addActionListener(handler);
r5button.addActionListener(handler); r15button.addActionListener(handler);
r6button.addActionListener(handler); r16button.addActionListener(handler);
r7button.addActionListener(handler); r17button.addActionListener(handler);
r8button.addActionListener(handler); r18button.addActionListener(handler);
r9button.addActionListener(handler); r19button.addActionListener(handler);
r10button.addActionListener(handler); r20button.addActionListener(handler);
bill.addActionListener(handler);
billButton.addActionListener(handler);
//counter.addActionListener(handler);
}
private class progHandler implements ActionListener{
@Override
public void actionPerformed(ActionEvent e){
int price = 450;
int suc_price = 450;
int total;
int accumulator=1;
if(e.getSource()==r1button)
{
total = price * accumulator;
counter.setText("" +total);
r1button.setEnabled(false);
accumulator++;
}
else if(e.getSource()==r2button)
{
total = price * accumulator;
counter.setText("" +accumulator);
r2button.setEnabled(false);
accumulator++;
}
else if(e.getSource()==r3button)
{
counter.setText("" +price);
r3button.setEnabled(false);
accumulator++;
}
else if(e.getSource()==r4button)
{
counter.setText("" +price);
r4button.setEnabled(false);
}
else if(e.getSource()==r5button)
{
counter.setText("" +price);
r5button.setEnabled(false);
}
else if(e.getSource()==r6button)
{
counter.setText("" +price);
r6button.setEnabled(false);
}
else if(e.getSource()==r7button)
{
counter.setText("" +price);
r7button.setEnabled(false);
}
else if(e.getSource()==r8button)
{
counter.setText("" +price);
r8button.setEnabled(false);
}
else if(e.getSource()==r9button)
{
counter.setText("" +price);
r9button.setEnabled(false);
}
else if(e.getSource()==r10button)
{
counter.setText("" +price);
r10button.setEnabled(false);
}
else if(e.getSource()==r11button)
{
counter.setText("" +price);
r11button.setEnabled(false);
}
else if(e.getSource()==r12button)
{
counter.setText("" +price);
r12button.setEnabled(false);
}
else if(e.getSource()==r13button)
{
counter.setText("" +price);
r13button.setEnabled(false);
}
else if(e.getSource()==r14button)
{
counter.setText("" +price);
r14button.setEnabled(false);
}
else if(e.getSource()==r15button)
{
counter.setText("" +price);
r15button.setEnabled(false);
}
else if(e.getSource()==r16button)
{
counter.setText("" +price);
r16button.setEnabled(false);
}
else if(e.getSource()==r17button)
{
counter.setText("" +price);
r17button.setEnabled(false);
}
else if(e.getSource()==r18button)
{
counter.setText("" +price);
r18button.setEnabled(false);
}
else if(e.getSource()==r19button)
{
counter.setText("" +price);
r19button.setEnabled(false);
}
else if(e.getSource()==r20button)
{
counter.setText("" +price);
r20button.setEnabled(false);
}
}
}
}