java bean消息驱动

java bean消息驱动2011-04-02
import java.awt.*;
import java.awt.event.*;
import java.io.Serializable;
import javax.swing.*;
import java.beans.*;
public class Loan extends JPanel implements ActionListener
{
protected PropertyChangeSupport changes=new PropertyChangeSupport（this）;
private String loanType=new String（"Personal Loan"）;
public void setLoanType（String temp）
{
String old=new String（）;
old=loanType;
loanType=temp;
changes.firePropertyChange（"loanType",old,temp）;
}
public String getLoanType（）
{
return loanType;
}
JLabel lid,ltype;
JTextField tid,ttype;
JButton submit;
public Loan（）
{
lid=new JLabel（"Enter Loan Id:"）;
tid=new JTextField（8）;
ltype=new JLabel（"Loan Type:"）;
ttype=new JTextField（15）;
submit=new JButton（"ADD NEW LOAN"）;
setLayout（new GridLayout（3,2））;
add（lid）;add（tid）;
add（ltype）;add（ttype）;
submit.addActionListener（this）;
add（submit）;
}
public void actionPerformed（ActionEvent evt）
{
Object obj=evt.getSource（）;
if（obj==
//Loan.java
/* This class contains the User Interface that Earnest Bank uses to add new loan types to the database. Whenever a new loan type is added, a property change event is generated */
submit
AN>）
setLoanType（ttype.getText（））;
}  
public void addPropertyChangeListener（PropertyChangeListener l）
{
changes.addPropertyChangeListener（l）;
}
public void removePropertyChangeListener（PropertyChangeListener l）
{
changes.removePropertyChangeListener（l）;
}
}
//CustomerLoan.java
/* The following class is used by Earnest Bank to accept the details of customers who take loans. Whenever a new loan type is added to the database, the loan type should be
made available to the user.
/* This class traps the property change event generated by the Loan class and adds the new loan type to its loan type combo box. */
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.beans.*;
import java.io.*;
public class CustomerLoan implements PropertyChangeListener
{
  static JFrame frameObj;
  JPanel mp,chp1, Mpane;
  Loan lp;
  BoxLayout bl;
  JLabel lcname,lctype;
  JTextField tcname;
  JComboBox tctype;
  public CustomerLoan（）
  {
    mp=new JPanel（）;
    chp1=new JPanel（）;
    Mpane=new JPanel（）;
    lp=new Loan（）;
    //bl=new BoxLayout（mp,BoxLayout.Y_AXIS）;
    //bl.addLayoutComponent（new String（"Loan Panel"）,lp）;
    //bl.addLayoutComponent（new String（"Customer Panel"）,chp1）;
    Mpane.setLayout（new FlowLayout（））;
    Mpane.add（lp）;
    Mpane.add（chp1）;
    frameObj.getContentPane（）.add（Mpane）;

    lcname=new JLabel（"Customer Name:"）;
    lctype=new JLabel（"Type of Loan taken:"）;
    tcname=new JTextField（6）;
    tctype=new JComboBox（）;
    tctype.addItem（lp.AN>getLoanType（））;
    chp1.setLayout（new GridLayout（2,2））;
    chp1.add（lcname）;
    chp1.add（tcname）;
    chp1.add（lctype）;
    chp1.add（tctype）;
    lp.addPropertyChangeListener（this）;
  }
  public void propertyChange（PropertyChangeEvent pcevent）
  {
    System.out.println（"propertyChange was call"）;
    tctype.addItem（pcevent.getNewValue（））;
  }
  public static void main（String args[]）
  {
    frameObj=new JFrame（"Loan Frame"）;
    new CustomerLoan（）;
    frameObj.setSize（400,400）;
    frameObj.setVisible（true）;
  }
}