0309复利计算软件
作业要求: 客户说:帮我开发一个复利计算软件。 完成复利公式计算程序,并成功PUSH到github上。
代码:
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); } }
界面和结果。