Thảo luận MANAGING BILLS FOR USING ELECTRICITY

mn cho mình nhờ chút, mình làm xong cái code của bài này rồi, nhưng phần GUI mình k biết làm , ai biết giúp mình vs.
Đây là đề:
Program Requirements:
Using array to develop application that manages bill information for using electricity.
· Define “Bill” class that includes:
o Attributes:
§ Customer code
§ Customer type
§ Old index of electricity meter
§ New index of electricity meter 0->500
o Methods:
§ Initiate the attributes of “Bill” class
§ Needed accessor methods (getters) and mutator methods (setters)
§ Calculate used electrical energy (KW) = New index of electricity meter – Old index of electricity meter
§ Calculate norm using electricity. It is known:
Customer Type Norm using electrictity (KW)(định mức sử dụng điện)
“NN” 500
“SX” or “KD” 400
otherwise 300
§ Calculate payment for using electricity = Used electrical energy * Unit price. It is known:
Used electrical energy Unit price
If Used electrical energy <= Norm 550 đồng /KW
otherwise 1100 đồng / KW
o Define array class to manage bill information. Each item in the list has the data type of “Bill” class
§ Methods of the class:
· Add a bill to the list
· Find out the bill corresponding with specified bill code
· Calculate the total bill payment of customers belonging among specified customer type
· Delete the bill corresponding with specified customer code
· Find out the bill having largest payment
o Define graphics user inteface class that supplies a input and output interface for bill information
§ When the user selects “Add”, “Find”, “Payment”, “Delete”, “Largest Payment” buttons, the corresponding method defined in the array class is called
§ Read in bill information, select “Add” button, the bill information is added to the list
§ Read in bill code, select “Find” button, the information of bill having the bill code is displayed
§ Read in customer type, select “Payment” button, the total payment of the bills belonging among the customer type is calculated
§ Read in customer code, select “Delete” button, the corresponding bill is removed from the list

§ Select “Largest Payment” button, the information of bill having the total largest payment is displayed. Đây là bài mình làm
public class Bill {
protected double Customer_code;
protected String Customer_type;
protected double Old_index_of_electricity_meter;
protected double New_index_of_electricity_meter;
protected double bill_code;
public Bill(){
Customer_code=0.0;
Customer_type=" ";
Old_index_of_electricity_meter=0.0;
New_index_of_electricity_meter=0.0;
bill_code=0.0;
}
public Bill(double Customer_code, String Customer_type, double Old_index_of_electricity_meter, double New_index_of_electricity_meter){
this.Customer_code=Customer_code;
this.Customer_type=Customer_type;
this.Old_index_of_electricity_meter=Old_index_of_electricity_meter;
this.New_index_of_electricity_meter=New_index_of_electricity_meter;
this.bill_code=bill_code;
}
public double electrical_energy(){
return New_index_of_electricity_meter-Old_index_of_electricity_meter;
}
public double norm_using_electricity(String s){ //mức điện nhập vào
double norm=0;
if(s.equals("NN"))
norm=500;
else
if(s.equals("SX") && s.equals("KD"))
norm=400;
else
norm=300;
return norm;
}
public double payment(){
double payment=0;
if(electrical_energy()<=500)
payment = 550 * electrical_energy();
else
payment= 1100*electrical_energy();
return payment;
}@Override
public String toString() {
return "Bill [Customer_code=" + Customer_code + ", Customer_type="[/COLOR][/SIZE][/SIZE][/COLOR][/B]
[B][COLOR=#000000][SIZE=2][SIZE=2][COLOR=#000080]+ Customer_type + ", Old_index_of_electricity_meter="[/COLOR][/SIZE][/SIZE][/COLOR][/B]
[B][COLOR=#000000][SIZE=2][SIZE=2][COLOR=#000080]+ Old_index_of_electricity_meter[/COLOR][/SIZE][/SIZE][/COLOR][/B]
[B][COLOR=#000000][SIZE=2][SIZE=2][COLOR=#000080]+ ", New_index_of_electricity_meter="[/COLOR][/SIZE][/SIZE][/COLOR][/B]
[B][COLOR=#000000][SIZE=2][SIZE=2][COLOR=#000080]+ New_index_of_electricity_meter + ", bill_code=" + bill_code[/COLOR][/SIZE][/SIZE][/COLOR][/B]
[B][COLOR=#000000][SIZE=2][SIZE=2][COLOR=#000080]+ "]";
}
public double getCustomer_code() {
return Customer_code;
}
public void setCustomer_code(double customer_code) {
Customer_code = customer_code;
}
public String getCustomer_type() {
return Customer_type;
}
public void setCustomer_type(String customer_type) {
Customer_type = customer_type;
}
public double getOld_index_of_electricity_meter() {
return Old_index_of_electricity_meter;
}
public void setOld_index_of_electricity_meter(
double old_index_of_electricity_meter) {
Old_index_of_electricity_meter = old_index_of_electricity_meter;
}
public double getNew_index_of_electricity_meter() {
return New_index_of_electricity_meter;
}
public void setNew_index_of_electricity_meter(
double new_index_of_electricity_meter) {
New_index_of_electricity_meter = new_index_of_electricity_meter;
}
public double getBill_code() {
return bill_code;
}
public void setBill_code(double bill_code) {
this.bill_code = bill_code;
}
public static void main(String[] args) {
Bill b=new Bill();
}
}
Đây là phần GUI, chưa biết làm thế nào nữa,
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class BillGui extends JFrame implements ActionListener,KeyListener{
private JButton bAdd,bFind,bPayment,bDelete,bLargest_Payment;
private JLabel lCustomer_code,lCustomer_type,lOld_index,lNew_index,lBill_code ;
private JTextField txtCustomer_code,txtCustomer_type,txtOld_index,txtNew_index,txtBill_code;
private JPanel p1,p2,p3,p4,p5,p6;

public BillGui(){
this.setLayout(new FlowLayout());
this.setTitle("MANAGING BILLS FOR USING ELECTRICITY");

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setSize(450,300);

this.setLocationRelativeTo(null);

this.setVisible(true);

lCustomer_code=new JLabel("Customer Code");
txtCustomer_code=new JTextField(10);
p1=new JPanel();
p1.setLayout(new FlowLayout());
p1.add(lCustomer_code);
p1.add(txtCustomer_code);

lCustomer_type=new JLabel("Customer Type");
txtCustomer_type=new JTextField(10);
p2=new JPanel();
p2.setLayout(new FlowLayout());
p2.add(lCustomer_type);
p2.add(txtCustomer_type);

lOld_index=new JLabel("Old index of electricity meter");
txtOld_index=new JTextField(10);
p3=new JPanel();
p3.setLayout(new FlowLayout());
p3.add(lOld_index);
p3.add(txtOld_index);

lNew_index=new JLabel("New index of electricity meter ");
txtNew_index=new JTextField(10);
p4=new JPanel();
p4.setLayout(new FlowLayout());
p4.add(lNew_index);
p4.add(txtNew_index);

lBill_code=new JLabel("Bill Code");
txtBill_code=new JTextField(10);
p5=new JPanel();
p5.setLayout(new FlowLayout());
p5.add(lBill_code);
p5.add(txtBill_code);

bAdd=new JButton("Add");
bFind=new JButton("Find");
bPayment=new JButton("Payment");
bDelete=new JButton("Delete");
bLargest_Payment=new JButton("Largest Payment");
p6=new JPanel();
p6.setLayout(new FlowLayout());
p6.add(bAdd);
p6.add(bFind);
p6.add(bPayment);
p6.add(bDelete);
p6.add(bLargest_Payment);

this.add(p1);
this.add(p2);
this.add(p3);
this.add(p4);
this.add(p5);
this.add(p6);
validate();


bAdd.addActionListener(this);
bFind.addActionListener(this);
bPayment.addActionListener(this);
bDelete.addActionListener(this);
bLargest_Payment.addActionListener(this);

txtCustomer_code.addKeyListener(this);
txtCustomer_type.addKeyListener(this);
txtOld_index.addKeyListener(this);
txtNew_index.addKeyListener(this);
txtBill_code.addKeyListener(this);
bAdd.addKeyListener(this);
bFind.addKeyListener(this);
bPayment.addKeyListener(this);
bDelete.addKeyListener(this);
bLargest_Payment.addKeyListener(this);
}
public static void main(String[] args) {
BillGui b=new BillGui();
}

@Override
public void actionPerformed(ActionEvent e) {
}

@Override
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub

}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub

}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub

}

}

ai qan tâm giúp mình vs, mình cảm ơn nhìu.