使用Java实现银行利息计算器

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.Date;
import java.text.SimpleDateFormat;
import java.util.*;
import java.text.DecimalFormat;
import java.awt.event.FocusListener; 
 
public class bankCalculator extends JFrame {
//define the Frame width and height
    static final int WIDTH=400;
    static final int HEIGHT=600;
    
    
   
    //定义按钮
    JButton JButton1 = new JButton("计算");
    JButton JButton2 = new JButton("清空");
    JButton JButton3 = new JButton("帮助");
    JButton JButton4 = new JButton("退出");
    JButton JButton5 = new JButton("!");
    JButton JButton6= new JButton("!");
    //存款，税率
    JLabel money=new JLabel("存款金额",JLabel.LEFT);
    JLabel rate=new JLabel("  税率",JLabel.LEFT);
    JTextField rate1=new JTextField(5);
    JTextField money1=new JTextField(10);
//利率,存款类型

    JLabel cklx=new JLabel("存款类型",JLabel.LEFT);
    Choice cklx1=new Choice();
    JLabel lilv=new JLabel("  利率",JLabel.LEFT);
    JTextField lilv1=new JTextField(5);
    //存款日期
    JLabel qktime=new JLabel("取款日期",JLabel.LEFT);
    JLabel qktime_year=new JLabel("年",JLabel.LEFT);
    JLabel qktime_month=new JLabel("月",JLabel.LEFT);
    JLabel qktime_day=new JLabel("日",JLabel.LEFT);
    JTextField qktime_year1=new JTextField(4);
    JTextField qktime_month1=new JTextField(2);
    JTextField qktime_day1=new JTextField(2);
    //取款日期
    JLabel cktime=new JLabel("存款日期",JLabel.LEFT);
    JLabel cktime_year=new JLabel("年",JLabel.LEFT);
    JLabel cktime_month=new JLabel("月",JLabel.LEFT);
    JLabel cktime_day=new JLabel("日",JLabel.LEFT);
    JTextField cktime_year1=new JTextField(4);
    JTextField cktime_month1=new JTextField(2);
    JTextField cktime_day1=new JTextField(2);
    //税前税后情况
    JLabel taxfrate=new JLabel("税前利息",JLabel.LEFT);
    JLabel taxbrate=new JLabel("税后利息",JLabel.LEFT);
    JLabel yuan=new JLabel("元",JLabel.LEFT);
    JTextField taxfrate1=new JTextField(10);
    JTextField taxbrate1=new JTextField(10);
    //本息合计和应缴利税
    JLabel yjtax=new JLabel("应缴利税",JLabel.LEFT);
    JLabel bxtotal=new JLabel("本息合计",JLabel.LEFT);
    JLabel yuan1=new JLabel("元",JLabel.LEFT);