用Java制作数字时钟 [英] Making a digital clock in Java
问题描述
我正在为一个项目制作一个数字时钟，我有四个类： DigitalTimeUI ，这是JFrame类， TitlePanel ， DigitPanel 和 ColonPanel ，它们是所述项目的JPanel。完成后，它应如下所示：
I'm making a digital clock for a project and I have four classes: DigitalTimeUI, which is the JFrame class, TitlePanel, DigitPanel, and ColonPanel, which are JPanels for the item stated. When it is finished, it should look like this:
我坚持的部分是将 DigitPanel 添加到框架中UI类。以下是我现在在主类中的内容：
The part I am stuck on is adding the DigitPanels to the frame in the UI class. Here's what I have in the main class right now:
public class DigitalTimeUI extends JFrame {
public static GregorianCalendar currentDate;
final static int CLOCKWIDTH = 605;
final static int CLOCKHEIGHT = 200;
public static void main(String[] args) {
int numOfDigits = 6;
int startingX = 0;
int startingY = 0;
Font clockFont = new Font("Tahoma", Font.BOLD, 72);
JFrame clock = new JFrame();
clock.setSize(CLOCKWIDTH, CLOCKHEIGHT);
clock.setVisible(true);
clock.setResizable(false);
clock.setDefaultCloseOperation(EXIT_ON_CLOSE);
TitlePanel titlePanel = new TitlePanel();
JLabel title = new JLabel("DIGITAL CLOCK");
title.setFont(clockFont);
title.setForeground(Color.BLACK);
titlePanel.add(title);
clock.add(titlePanel);
DigitPanel digitPanel = new DigitPanel();
JLabel digit;
startingY = 115;
while (numOfDigits > 0) {
if ((numOfDigits % 2) == 0) {
startingX += 5;
digit = new JLabel(String.valueOf(0));
}
}
}
}
这段代码现在变得一团糟，在我得到最后一部分后，我还有一些清理工作要做。这个底部只是我试图显示6位数字段的一些废料。我认为我遇到的主要问题是找到一种方法来分割从 GregorianCalendar 返回的时间并将它们分成6个不同的方框，然后将它们放入6个不同的方框中使用while循环或诸如此类的框架。
The code is kind of a mess right now, I've still got some cleaning up to do after I get that last part figured out. That bottom part is just some scrap from my attempts to display the 6 digit fields. I think the main problem I'm having is finding a way to split up the time returned from GregorianCalendar and put them into 6 different boxes, then an efficient way to put them into the frame using a while loop or whatnot.
澄清：以上图片由教师提供给我作为格式化时钟的指南。它还有9个面板。 DIGITAL TIME是 TitlePanel 类的面板。数字框是 DigitPanel 类，其中有6个。冒号框是 ColonPanel 类，其中有两个。我遇到的问题是将时间分成6个不同的方框。就像，图片显示48，我需要一种方法从 GregorianCalendar.MINUTE 或其他任何东西中获取值，并将其分成4和8放入每个那些盒子。谢谢。
To clarify: The above picture was given to me by the instructor as a guideline to go by when formatting my clock. It also has 9 panels in it. The "DIGITAL TIME" is a panel of the TitlePanel class. The digit boxes are of the DigitPanel class and there are 6 of them. The colon boxes are of the ColonPanel class and there are two of them. The issue I am having is with splitting up the time into 6 different boxes. Like, where the picture shows "48", I need a way to take the value from GregorianCalendar.MINUTE or whatever and split it into a 4 and an 8 to put into each of those boxes. Thanks.
推荐答案
如果我理解正确的话......
If I understand the question correctly...
您在OO环境中工作。您应该尽可能地将设计分解为最小的可管理工作单元。
You're working in a OO environment. You should break your design down the smallest manageable units of work as you can.
对我来说，这意味着每个数字（或时间单位）是最小的工作单位。这将需要一个只能显示0填充int值的组件。
For me, this means that each digit (or time unit) is the smallest unit of work. This would require a component that was simply capable of displaying a 0 padded int value.
从那里，您可以使用3位数窗格构建一个时钟窗格on。
From there, you could build it up a clock pane, using 3 digit panes as so on.
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Calendar;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class DigitalClock {
public static void main(String[] args) {
new DigitalClock();
}
public DigitalClock() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private DigitPane hour;
private DigitPane min;
private DigitPane second;
private JLabel[] seperator;
private int tick = 0;
public TestPane() {
setLayout(new GridBagLayout());
hour = new DigitPane();
min = new DigitPane();
second = new DigitPane();
seperator = new JLabel[]{new JLabel(":"), new JLabel(":")};
add(hour);
add(seperator[0]);
add(min);
add(seperator[1]);
add(second);
Timer timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Calendar cal = Calendar.getInstance();
hour.setValue(cal.get(Calendar.HOUR_OF_DAY));
min.setValue(cal.get(Calendar.MINUTE));
second.setValue(cal.get(Calendar.SECOND));
if (tick % 2 == 1) {
seperator[0].setText(" ");
seperator[1].setText(" ");
} else {
seperator[0].setText(":");
seperator[1].setText(":");
}
tick++;
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.start();
}
}
public class DigitPane extends JPanel {
private int value;
@Override
public Dimension getPreferredSize() {
FontMetrics fm = getFontMetrics(getFont());
return new Dimension(fm.stringWidth("00"), fm.getHeight());
}
public void setValue(int aValue) {
if (value != aValue) {
int old = value;
value = aValue;
firePropertyChange("value", old, value);
repaint();
}
}
public int getValue() {
return value;
}
protected String pad(int value) {
StringBuilder sb = new StringBuilder(String.valueOf(value));
while (sb.length() < 2) {
sb.insert(0, "0");
}
return sb.toString();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
String text = pad(getValue());
FontMetrics fm = getFontMetrics(g.getFont());
int x = (getWidth() - fm.stringWidth(text)) / 2;
int y = ((getHeight()- fm.getHeight()) / 2) + fm.getAscent();
g.drawString(text, x, y);
}
}
}
已更新
基本上你可以做类似......
Basically you can do something like...
String min = String.valueOf(Calendar.getInstance().get(Calendar.MINUTE));
char[] digits = min.toCharArray();
这篇关于用Java制作数字时钟的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
