小程序---金额转换

来源：互联网发布：淘宝开店不可用余额编辑：程序博客网时间：2024/06/05 15:23
这是课本里面的一个例题，我进行了优化写出了这个较为满意的程序，
有不好的地方希望多多指教。
import java.awt.BorderLayout;import java.awt.Color;import java.awt.Container;import java.awt.FlowLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JDialog;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.event.CaretEvent;import javax.swing.event.CaretListener;public class MoneyJFrame extends JFrame implements CaretListener {    private JTextField tfdNum,tfdChinese;    private MesDialog mdg ;    public MoneyJFrame() {        super("金额转换");        setBounds(200, 100, 450, 130);        setDefaultCloseOperation(EXIT_ON_CLOSE);        Container c = getContentPane();//获得内容窗格        c.setLayout(new FlowLayout(FlowLayout.RIGHT));        c.add(new JLabel("金额："));        tfdNum = new JTextField("123.45",30);        c.add(tfdNum);        c.add(new JLabel("中文大写："));        tfdChinese = new JTextField("",30);        tfdChinese.setEditable(false);        c.add(tfdChinese);        //添加插入符号监听器        tfdNum.addCaretListener(this);        //创建一个错误提示窗口，但不显示        mdg = new MesDialog(this);        //无事件源的触发一下监听器，目的是为了把默认的金额转换成大写        caretUpdate(null);        setVisible(true);       }    public static void main(String[] args) {        new MoneyJFrame();    }    @Override    public void caretUpdate(CaretEvent e) {        String str = tfdNum.getText();        str.trim();        if (str == null|| str.length()==0) {            tfdChinese.setText("");            return ;        }        try {            double num = Double.parseDouble(str);            if (Math.log10(num)>12) {                String mes = str+" 已超过检索范围";                mdg.show(mes);                return;            }            String Chinese = toChinese(num);            tfdChinese.setText(Chinese);        } catch (NumberFormatException e1) {            String mes = "错误的输入:"+str;            mdg.show(mes);        }    }    private String toChinese(double num) {        String unit = "佰拾亿仟佰拾万仟佰拾圆角分";        String money = "零壹贰叁肆伍陆柒捌玖";        String res = "";        long x = (long)((num+0.005)*100);        int index = unit.length()-1;        while (x>0 && index>-1) {            res = ""+money.charAt((int)(x%10))+unit.charAt(index--)+res;            x /= 10;        }        return res;    }}//输入错误的提示窗口class MesDialog extends JDialog{    private JFrame jFrame;    private JLabel lb;    public MesDialog(JFrame jFrame) {        this.jFrame = jFrame;        setTitle("错误提示");        setSize(300, 120);        Container c = getContentPane();        c.setBackground(Color.WHITE);        lb = new JLabel();        c.add(lb);        JButton btnOk = new JButton("确定");        btnOk.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                setVisible(false);            }        });        JPanel p = new JPanel();        p.setBackground(Color.WHITE);        p.add(btnOk);        c.add(p,BorderLayout.SOUTH);    }    public void show(String mes) {        lb.setText(mes);        setLocation(jFrame.getX()+90, jFrame.getY()+70);        setVisible(true);    }}
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