0311软件工程复利软件单利及期望值的实现

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) + "\n";
					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) + "\t\t\t"
								+ currencyformatter.format(amount) + "\n";
						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) + "\n";
					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) + "\t\t\t"
								+ currencyformatter.format(amount) + "\n";
						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

	}
}

　　界面及运行结果