一个JAVABean的小例子

//Loan.Java

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.beans.*;

public class Loan extends JPanel implements ActionListener

{

JLabel lType,lAmount,lmonth,lInstlmnt;

JTextField tAmount,tmonth,tInstlmnt;

JList tType;

JButton submit;

String loanType;

String[] interestRates={"5","5","4"};

public String[] getInterestRates()

{

return interestRates;

}

public void setInterestRates(String[] interestRates)

{

this.interestRates=interestRates;

}

public Loan()

{

lType=new JLabel("贷款类型:");

lAmount=new JLabel("贷款金额:");

lmonth=new JLabel("贷款月数:");

lInstlmnt=new JLabel("每月应付金额:");

tAmount=new JTextField(10);

tmonth=new JTextField(10);

tInstlmnt=new JTextField(10);

String[] Type={"Housing","Personal","Car"};

tType=new JList(Type);

submit=new JButton("È?¶¨");

setLayout(new GridLayout(5,2));

add(lType); add(tType);

add(lAmount); add(tAmount);

add(lmonth);add(tmonth);

add(lInstlmnt);add(tInstlmnt);

add(submit);

lInstlmnt.setVisible(false);

tInstlmnt.setVisible(false);

submit.addActionListener(this);

}

public void actionPerformed(ActionEvent evt)

{

float intlmnt=0;

int carloan=0;

int personalloan=0;

int houseloan=0;

int amount;

int noofmonth;

JButton source=(JButton)evt.getSource();

amount=Integer.parseInt(tAmount.getText());

noofmonth=Integer.parseInt(tmonth.getText());

//loanType = (String)tType.getSelectedValue();

//tInstlmnt.setText("sample");

int amtpermonth=amount/noofmonth;

if(!(interestRates[0]).equals(""))

{

carloan=Integer.parseInt(interestRates[0]);

}

if(!(interestRates[1]).equals(""))

{

personalloan=Integer.parseInt(interestRates[1]);

}

if(!(interestRates[2]).equals(""))

{

houseloan=Integer.parseInt(interestRates[2]);

}

loanType=(String)tType.getSelectedValue();

if(loanType.equals("Personal"))

{

intlmnt=(personalloan*amount)/(100*noofmonth);

}

if(loanType.equals("Housing"))

{

intlmnt=(houseloan*amount)/(100*noofmonth);

}

if(loanType.equals("Car"))

{

intlmnt=(carloan*amount)/(100*noofmonth);

}

tInstlmnt.setText(String.valueOf(intlmnt+amtpermonth));

lInstlmnt.setVisible(true);

tInstlmnt.setVisible(true);

tInstlmnt.setEnabled(false);

}

}

//LoanEditor.java

import java.beans.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class LoanEditor extends JPanel implements PropertyEditor,ActionListener

{

JLabel lcar,lpersonal,lhouse;

JTextField tcar,tpersonal,thouse;

String[] interestRates={"","",""};

JPanel Panel;

public Object getValue()

{

interestRates[0]=tcar.getText();

interestRates[1]=tpersonal.getText();

interestRates[2]=thouse.getText();

return interestRates;

}

public void setValue(Object ctemp)

{

interestRates= (String[]) ctemp;

tcar.setText(interestRates[0]);

tpersonal.setText(interestRates[1]);

thouse.setText(interestRates[2]);

}

public Component getCustomEditor(){return this;}

public LoanEditor()

{

lcar=new JLabel("Æ&UCirc;³µ´û¿î");

lpersonal=new JLabel("¸öÈË´û¿î");

lhouse=new JLabel("?¿ÎÝ´û¿î");

tcar=new JTextField(10);

tpersonal=new JTextField(10);

thouse=new JTextField(10);

setLayout(new BorderLayout());

Panel=new JPanel();

Panel.setLayout(new GridLayout(3,2));

Panel.add(lcar); Panel.add(tcar);

Panel.add(lpersonal); Panel.add(tpersonal);

Panel.add(lhouse); Panel.add(thouse);

add(new JPanel(),BorderLayout.WEST);

add(new JPanel(),BorderLayout.EAST);

add(Panel,BorderLayout.CENTER);

tcar.addActionListener(this);

tpersonal.addActionListener(this);

thouse.addActionListener(this);

}

public void actionPerformed(ActionEvent evt)

{

interestRates[0]=tcar.getText();

interestRates[1]=tpersonal.getText();

interestRates[2]=thouse.getText();

}

public boolean isPaintable(){ return true;}

public void paintValue(Graphics g,Rectangle r){}

public String getJavaInitializationString(){ return null;}

public String getAsText(){return null;}

public void setAsText(String s) throws

IllegalArgumentException{}

public String[] getTags(){ return null;}

public boolean supportsCustomEditor(){ return true;}

}

//LoanBeanInfo.java

import java.beans.*;

import java.awt.*;

public class LoanBeanInfo extends SimpleBeanInfo

{

public PropertyDescriptor[] getPropertyDescriptors()

{

try

{

PropertyDescriptor interestRates=new PropertyDescriptor("interestRates",Loan.class);

interestRates.setPropertyEditorClass(LoanEditor.class);

PropertyDescriptor arr[]=new PropertyDescriptor[1];

arr[0]=interestRates;

return arr;

}

catch(Exception e)

{

System.out.println(e);

return null;

}

}

}

//Loan.mft

Name: Loan.class

Java-Bean: True

Name: LoanEditor.class

Java-Bean: False

Name: LoanBeanInfo.class

Java-Bean: False

打包程序 jar cvfm Loan.jar Loan.mft *.class