复利计算总结

 import java.awt.Color; 
import java.awt.Container; 
import java.awt.Dimension; 
import java.awt.FlowLayout; 
import java.awt.Font; 
import java.awt.Graphics; 
import java.awt.GridLayout; 
import java.awt.Image; 
import java.awt.Toolkit; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.text.NumberFormat; 
  
import javax.swing.ImageIcon; 
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; 
import javax.swing.border.LineBorder; 
 
public class Interest  extends JFrame 
{ 
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 JButton c3; 
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 "); 
a1.setFont(new Font("宋体",Font.BOLD,18)); 
a2=new JLabel("年利率 "); 
a2.setFont(new Font("宋体",Font.BOLD,18)); 
a3=new JLabel("年 数 "); 
a3.setFont(new Font("宋体",Font.BOLD,18)); 
  
b1=new JTextField(10); 
b2=new JTextField(10); 
b3=new JTextField(10); 
c1=new JButton("计算"); 
c1.setFont(new Font("宋体",Font.BOLD,15)); 
c3=new JButton(""); 
c3.setBackground(Color.GREEN); 
c3.setToolTipText("LOVE YOU FOREVER"); 
c3.setBorder(new LineBorder(Color.RED,3)); 
c3.setFont(new Font("宋体",Font.BOLD,20)); 
c3.setForeground(Color.YELLOW); 
c2=new JButton("清除"); 
c2.setFont(new Font("宋体",Font.BOLD,15)); 
text=new JTextArea(); 
} 
private void layoutComponents() 
{ 
//Container c=this.getContentPane();     
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(c3); 
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(); 
    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(); 
    String output="年"+"/t"+"复利存款"+"/n"; 
     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(""); 
} 
} 
private class c3ActionEventHander implements ActionListener 
{ 
public void actionPerformed(ActionEvent e) 
{ 
    b1.setText(""); 
    b2.setText(""); 
    b3.setText(""); 
} 
} 
public static void main(String[] args) 
{ 
     Interest frame=new Interest(); 
    frame.setVisible(true); 
    frame.setSize(450,200);  
  frame.setResizable(false); 
} 
} 

 

所用语言与工具：Java，Eclipse

代码行:90行

工作量（人时）：2个小时

本来估计要3小时左右，最后请教了别人快了很多

一开始是用C做的，但C做的界面那些都不好看，改成用JAVA做了，期间遇到很多困难，但在多次的尝试下，慢慢解决，理解了更多JAVA制作窗口，更加熟练，也对函数的调用更加熟悉。