怎样写一个钟表的GUI？

jdk自带的demo不就有吗%JAVA_HOME%\demo\applets\Clock 到上面那个文件夹看看

package com.clock;import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.*;
import java.util.Calendar;
import java.util.GregorianCalendar;@SuppressWarnings("serial")
class Clock extends JFrame implements ActionListener { int x, y, x0, y0, r, h, olds_x, olds_y, oldm_x, oldm_y, oldh_x, oldh_y, ss,
mm, hh, old_m, old_h, ang;
final double RAD = Math.PI / 180; //构造函数创建一个窗体
public Clock() {
super("Java时钟");
setDefaultCloseOperation(3);
setSize(200, 200);
setBackground(Color.white);
setLocation(300, 150);
setResizable(false);
setVisible(true);
int delay = 1000;
//创建一个监听事件
ActionListener drawClock = new ActionListener() {
/* （非 Javadoc）
* @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
*/
public void actionPerformed(ActionEvent evt) {
repaint();
}
};
//创建一个时间计数器
new Timer(delay, drawClock).start();
} //实现ActionListener接口必须实现的方法
public void actionPerformed(ActionEvent e) {
} //绘制图形
public void paint(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
Insets insets = getInsets();
int L = insets.left / 2, T = insets.top / 2;
h = getSize().height;
g.setColor(Color.BLACK);
//画圆
g2D.setStroke(new BasicStroke(4.0f));
g.drawOval(L + 40, T + 40, h - 80, h - 80);
r = h / 2 - 40;
x0 = 40 + r - 5 + L;
y0 = 40 + r - 5 - T;
ang = 60;
//绘制时钟上的12个汉字
for (int i = 1; i <= 12; i++) {
x = (int) ((r + 10) * Math.cos(RAD * ang) + x0);
y = (int) ((r + 10) * Math.sin(RAD * ang) + y0);
g.drawString("" + i, x, h - y);
ang -= 30;
}
//获得现在时间
Calendar now = new GregorianCalendar();
int nowh = now.get(Calendar.HOUR_OF_DAY);
int nowm = now.get(Calendar.MINUTE);
int nows = now.get(Calendar.SECOND);
String st;
if (nowh < 10)
st = "0" + nowh;
else
st = "" + nowh;
if (nowm < 10)
st += ":0" + nowm;
else
st += ":" + nowm;
if (nows < 10)
st += ":0" + nows;
else
st += ":" + nows;
//在窗体上显示时间
g.setColor(Color.pink);
g.fillRect(L, T, 50, 28);
g.setColor(Color.blue);
g.drawString(st, L + 2, T + 26);
//计算时间与度数的关系
ss = 90 - nows * 6;
mm = 90 - nowm * 6;
hh = 90 - nowh * 30 - nowm / 2;
x0 = r + 40 + L;
y0 = r + 40 + T;
g2D.setStroke(new BasicStroke(1.2f));
//擦除秒针
if (olds_x > 0) {
g.setColor(getBackground());
g.drawLine(x0, y0, olds_x, h - olds_y);
} else {
old_m = mm;
old_h = hh;
}
//绘制秒针
x = (int) (r * 0.9 * Math.cos(RAD * ss)) + x0;
y = (int) (r * 0.9 * Math.sin(RAD * ss)) + y0 - 2 * T;
g.setColor(Color.yellow);
g.drawLine(x0, y0, x, h - y);
olds_x = x;
olds_y = y;
g2D.setStroke(new BasicStroke(2.2f));
//擦除分针
if (old_m != mm) {
g.setColor(getBackground());
g.drawLine(x0, y0, oldm_x, h - oldm_y);
}
//绘制分针
x = (int) (r * 0.7 * Math.cos(RAD * mm)) + x0;
y = (int) (r * 0.7 * Math.sin(RAD * mm)) + y0 - 2 * T;
g.setColor(Color.green);
g.drawLine(x0, y0, x, h - y);
oldm_x = x;
oldm_y = y;
old_m = mm;
g2D.setStroke(new BasicStroke(3.4f));
//擦除时针
if (old_h != hh) {
g.setColor(getBackground());
g.drawLine(x0, y0, oldh_x, h - oldh_y);
}
//绘制时针
x = (int) (r * 0.5 * Math.cos(RAD * hh)) + x0;
y = (int) (r * 0.5 * Math.sin(RAD * hh)) + y0 - 2 * T;
g.setColor(Color.red);
g.drawLine(x0, y0, x, h - y);
oldh_x = x;
oldh_y = y;
old_h = hh;
} public static void main(String[] args) {
@SuppressWarnings("unused")
Clock c = new Clock();
} public void clear(Graphics g, int i, int j, int k, Color background) {
// TODO 自动生成方法存根 }
}

下面是一个简单的例子，复杂的明天整理一下再发到这来import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.text.DecimalFormat;
import java.util.Calendar;/** A simple Clock */
public class Clock extends javax.swing.JComponent {
  protected DecimalFormat tflz, tf;  protected boolean done = false;  public Clock() {
    new Thread(new Runnable() {
      public void run() {
        while (!done) {
          Clock.this.repaint(); // request a redraw
          try {
            Thread.sleep(1000);
          } catch (InterruptedException e) { /* do nothing */
          }
        }
      }
    }).start();
    tf = new DecimalFormat("#0");
    tflz = new DecimalFormat("00");
  }  public void stop() {
    done = true;
  }  /* paint() - get current time and draw (centered) in Component. */
  public void paint(Graphics g) {
    Calendar myCal = Calendar.getInstance();
    StringBuffer sb = new StringBuffer();
    sb.append(tf.format(myCal.get(Calendar.HOUR)));
    sb.append(':');
    sb.append(tflz.format(myCal.get(Calendar.MINUTE)));
    sb.append(':');
    sb.append(tflz.format(myCal.get(Calendar.SECOND)));
    String s = sb.toString();
    FontMetrics fm = getFontMetrics(getFont());
    int x = (getSize().width - fm.stringWidth(s)) / 2;
    // System.out.println("Size is " + getSize());
    g.drawString(s, x, 10);
  }  public Dimension getPreferredSize() {
    return new Dimension(100, 30);
  }  public Dimension getMinimumSize() {
    return new Dimension(50, 10);
  }
}

6楼的编译通不过啊
netbeans编译的结果：
init:
deps-jar:
Warning: clock\ClockApp.java modified in the future.
Compiling 3 source files to E:\code\clock\clock\build\classes
E:\code\clock\clock\src\clock\ClockApp.java:8: 类 Clock 是公共的，应在名为 Clock.java 的文件中声明
public class Clock extends javax.swing.JComponent {
E:\code\clock\clock\src\clock\ClockAboutBox.java:41: 找不到符号
符号：类 ClockApp
位置：软件包 clock
        org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(clock.ClockApp.class).getContext().getResourceMap(ClockAboutBox.class);
E:\code\clock\clock\src\clock\ClockAboutBox.java:47: 找不到符号
符号：类 ClockApp
位置：软件包 clock
        javax.swing.ActionMap actionMap = org.jdesktop.application.Application.getInstance(clock.ClockApp.class).getContext().getActionMap(ClockAboutBox.class, this);
E:\code\clock\clock\src\clock\ClockView.java:87: 找不到符号
符号：变量 ClockApp
位置：类 clock.ClockView
            JFrame mainFrame = ClockApp.getApplication().getMainFrame();
E:\code\clock\clock\src\clock\ClockView.java:91: 找不到符号
符号：变量 ClockApp
位置：类 clock.ClockView
        ClockApp.getApplication().show(aboutBox);
E:\code\clock\clock\src\clock\ClockView.java:130: 找不到符号
符号：类 ClockApp
位置：软件包 clock
        org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(clock.ClockApp.class).getContext().getResourceMap(ClockView.class);
E:\code\clock\clock\src\clock\ClockView.java:134: 找不到符号
符号：类 ClockApp
位置：软件包 clock
        javax.swing.ActionMap actionMap = org.jdesktop.application.Application.getInstance(clock.ClockApp.class).getContext().getActionMap(ClockView.class, this);
7 错误
生成失败（总时间：0 秒）

调试易

怎样写一个钟表的GUI？

解决方案 »