0309复利计算软件

package ch1;

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class Interest extends JFrame {

private static final long serialVersionUID = 3347254632537686808L;
private JLabel a1;
private JLabel a2;
private JLabel a3;
private JTextField b1;
private JTextField b2;
private JTextField b3;
private JButton c1;
private JButton c2;

private JTextArea text;

public Interest() {
creatComponents();
layoutComponents();
registerHandlers();
setTitle("复利存款应用程序");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
}

private void creatComponents() {
a1 = new JLabel("本 金 ");
a2 = new JLabel("年利率 ");
a3 = new JLabel("年 数 ");
b1 = new JTextField(10);
b2 = new JTextField(10);
b3 = new JTextField(10);
c1 = new JButton("计算");
c2 = new JButton("清除");
text = new JTextArea();
}

private void layoutComponents() {
setLayout(new FlowLayout());
JPanel panel1 = new JPanel();
panel1.add(a1);
panel1.add(b1);
JPanel panel2 = new JPanel();
panel2.add(a2);
panel2.add(b2);
JPanel panel3 = new JPanel();
panel3.add(a3);
panel3.add(b3);
JPanel panel4 = new JPanel();
panel4.add(c1);
panel4.add(c2);
JPanel leftpanel = new JPanel(new GridLayout(4, 1));
leftpanel.add(panel1);
leftpanel.add(panel2);
leftpanel.add(panel3);
leftpanel.add(panel4);
JScrollPane panel5 = new JScrollPane(text);
panel5.setPreferredSize(new Dimension(200, 150));
add(leftpanel);
add(panel5);
}

private void registerHandlers() {
c1ActionEventHander hander1 = new c1ActionEventHander();
c1.addActionListener(hander1);
c2ActionEventHander hander2 = new c2ActionEventHander();
c2.addActionListener(hander2);
// c3ActionEventHander hander3=new c3ActionEventHander();

}

private class c1ActionEventHander implements ActionListener {
public void actionPerformed(ActionEvent e) {
double principal;
double amount;
double rate;
int n;
NumberFormat currencyformatter = NumberFormat.getCurrencyInstance();
String output = "年" + "/" + "复利存款";
int year = 1;
principal = Double.parseDouble(b1.getText());
rate = Double.parseDouble(b2.getText());
n = Integer.parseInt(b3.getText());
while (year <= n) {
amount = principal * Math.pow(1 + rate, year);
output += String.valueOf(year) + "\t"
+ currencyformatter.format(amount) + "\n";
year = year + 1;
}
text.setText(output);
}
}

private class c2ActionEventHander implements ActionListener {
public void actionPerformed(ActionEvent e) {
b1.setText("");
b2.setText("");
b3.setText("");
text.setText("");
}
}

public static void main(String[] args) {
Interest frame = new Interest();
frame.setVisible(true);
frame.setSize(450, 200);
frame.setResizable(false);
}
}