import java.applet.Applet;

import java.awt.BorderLayout;

import java.awt.Frame;

import java.awt.Panel;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowEvent;

import java.awt.event.WindowListener;

import javax.swing.JButton;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextField;

public class ExchangeRate extends Applet implements ActionListener

{

private JFrame frame=new JFrame("转换");

private JTextField text1=new JTextField();

private JTextField text2=new JTextField();

private String s[]={"美元USD ","人民币CNY","日元 JPY",

"欧元EUR","韩元KPW","CAD","澳元AUD","英镑GBP","台币TWD","NZD"};

private float rate[]={1,(float)6.8269,(float)89.1821992,(float)0.684134911,(float)1162.7907 ,

(float)1.06079974 ,(float)1.09793588 ,(float) 0.615763547 ,(float)32.1646832,(float)1.38159713};

private JComboBox cb=null;

private JComboBox cb1=null;

private double sum;//兑换后的金额

JLabel num=new JLabel("兑换金额");

JLabel money=new JLabel ("由 ");

JLabel bmoney=new JLabel("兑换至 ");

JLabel bnum=new JLabel("兑换后的金额为");

Panel p1;

Panel p2;

Panel p3;

Panel p4;

Panel p5;

JButton button;

public void init()

{

cb=new JComboBox(s);

cb1=new JComboBox(s);

text1 = new JTextField(15);

text2= new JTextField(10) ;

p1=new Panel();

p2=new Panel();

p3=new Panel();

p4=new Panel();

p5=new Panel();

p1.add(num,BorderLayout.WEST);

p1.add(text1,BorderLayout.EAST);

p2.add(money,BorderLayout.WEST);

p2.add(cb,BorderLayout.EAST);

p3.add(bmoney,BorderLayout.WEST);

p3.add(cb1,BorderLayout.EAST);

add(p1,BorderLayout.NORTH);

add(p2,BorderLayout.CENTER);

add(p3,BorderLayout.SOUTH);

button=new JButton("兑换");

p4.add(button,BorderLayout.WEST);

add(p4);

p5.add(bnum,BorderLayout.WEST);

p5.add(text2,BorderLayout.EAST);

add(p5);

//cb.addActionListener(this);

//cb1.addActionListener(this);

button.addActionListener(this);

}

public void actionPerformed(ActionEvent e) {

JButton button1=(JButton) e.getSource();

java.text.DecimalFormat df=new java.text.DecimalFormat("#.000000");

String text=text1.getText();

String sum1;

int cbx = cb.getSelectedIndex();//记录下标

int cb1x=cb1.getSelectedIndex();

if(button1==button)

{

sum=Float.parseFloat(text);

if(sum>0)

{

sum1=df.format((double)rate[cb1x]/(double)rate[cbx]*sum);

text2.setText(sum1);

}

else

text2.setText("你输入的金额错误！");

}

}

public static void main(String[] args) {

ExchangeRate er = new ExchangeRate();

Frame f = new Frame();

f.add(er);

f.setSize(500, 500);

er.init();

f.addWindowListener(new WindowListener(){

public void windowActivated(WindowEvent e) {}

public void windowClosed(WindowEvent e) {}

public void windowClosing(WindowEvent e) {

e.getWindow().dispose();

}

public void windowDeactivated(WindowEvent e) { }

public void windowDeiconified(WindowEvent e) { }

public void windowIconified(WindowEvent e) { }

public void windowOpened(WindowEvent e) { } 

});

f.show();

}

}

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