package ch1;
import java.awt.BorderLayout;import java.awt.Component;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Graphics;import java.awt.GridLayout;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.text.NumberFormat;import javax.imageio.ImageIO;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;import org.omg.CosNaming.NamingContextExtPackage.AddressHelper;public class fuli extends JFrame { private static final long serialVersionUID = 3347254632537686808L; private JLabel a1; // 标签 private JLabel a2; private JLabel a3; private JLabel a4; private JTextField b1; // 本金 private JTextField b2; // 利率 private JTextField b3; // 年份 private JTextField b4; // 期望值 private JButton c1; private JButton c2; private JButton c3; private JTextArea text; // 显示纯文本的多行区域 private JPanel toolbar = new JPanel(); public fuli() { setTitle("复利存款应用程序"); creatComponents(); // 创建零件 layoutComponents(); // 设计零件 registerHandlers(); // 鼠标监控 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 "); a4 = new JLabel("期望值"); b1 = new JTextField(10); b2 = new JTextField(10); b3 = new JTextField(10); b4 = new JTextField(10); c1 = new JButton("复利"); c2 = new JButton("清除"); c3 = new JButton("单利"); 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 panel6 = new JPanel(); panel6.add(a4); panel6.add(b4); JPanel leftpanel = new JPanel(new GridLayout(3, 1)); leftpanel.add(panel1); leftpanel.add(panel2); leftpanel.add(panel3); leftpanel.add(panel6); JScrollPane panel5 = new JScrollPane(text); panel5.setPreferredSize(new Dimension(400, 200)); toolbar.add(c1); toolbar.add(c2); toolbar.add(c3); add(leftpanel); add(panel5); add(toolbar, BorderLayout.EAST); } private void registerHandlers() { c1ActionEventHander hander1 = new c1ActionEventHander(); c1.addActionListener(hander1); c2ActionEventHander hander2 = new c2ActionEventHander(); c2.addActionListener(hander2); c3ActionEventHander hander3 = new c3ActionEventHander(); c3.addActionListener(hander3); } private class c1ActionEventHander implements ActionListener { public void actionPerformed(ActionEvent e) { double principal; double amount; double rate; int n; NumberFormat currencyformatter = NumberFormat.getCurrencyInstance(); // 字符串转化为数字 String output = "年" + "/" + "复利存款"; int year =1; rate = Double.parseDouble(b2.getText()); n = Integer.parseInt(b3.getText()); if(b1.getText().equals("")) { if (b4.getText().equals("")) { JOptionPane.showMessageDialog(null, "请输入本金或者期望值"); } else{ amount = Double.parseDouble(b4.getText()); principal=0; while (year <= n) { principal=amount/(Math.pow(1 + rate, year)); year = year + 1; } output="本金"+currencyformatter.format(principal) + "
"; text.setText(output); } } else { principal = Double.parseDouble(b1.getText()); // 字符串转化为数字 if (b4.getText().equals("")) { while (year <= n) { amount = principal * Math.pow(1 + rate, year); output += String.valueOf(year) + " " + currencyformatter.format(amount) + "
"; year = year + 1; } text.setText(output); } else{ JOptionPane.showMessageDialog(null, "本金和期望值输入一个即可"); } } } } private class c2ActionEventHander implements ActionListener { public void actionPerformed(ActionEvent e) { b1.setText(""); b2.setText(""); b3.setText(""); b4.setText(""); text.setText(""); } } private class c3ActionEventHander implements ActionListener { public void actionPerformed(ActionEvent e) { double principal; double amount; double rate; int n; NumberFormat currencyformatter = NumberFormat.getCurrencyInstance(); String output = "年" + "/" + "单利存款"; int year = 1; rate = Double.parseDouble(b2.getText()); n = Integer.parseInt(b3.getText()); if(b1.getText().equals("")) { if (b4.getText().equals("")) { JOptionPane.showMessageDialog(null, "请输入本金或者期望值"); } else{ amount = Double.parseDouble(b4.getText()); principal=0; while (year <= n) { principal = amount / (1 + rate* year); year = year + 1; } output="本金"+currencyformatter.format(principal) + "
"; text.setText(output); } } else { principal = Double.parseDouble(b1.getText()); // 字符串转化为数字 if (b4.getText().equals("")) { while (year <= n) { amount = principal * (1 + rate* year); output += String.valueOf(year) + " " + currencyformatter.format(amount) + "
"; year = year + 1; } text.setText(output); } else{ JOptionPane.showMessageDialog(null, "本金和期望值输入一个即可"); } } } } public static void main(String[] args) { int Windowswidth=500; int Windowsheight=400; fuli frame = new fuli(); frame.setVisible(true); frame.setSize(Windowswidth, Windowsheight); frame.setResizable(false); int width = Toolkit.getDefaultToolkit().getScreenSize().width; int height = Toolkit.getDefaultToolkit().getScreenSize().height; frame.setLocation((width-Windowswidth )/ 2, (height-Windowsheight)/ 2); //窗口居中 }}