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import java.awt.*;
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import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.Timer;
public class Clock extends JFrame implements ActionListener {
public final int HEIGTH = 200, L0 = 50, T0 = 50,N=8;
public final double RAD = Math.PI / 180.0;
int x, y, old_X, old_Y, r, x0, y0, w, h, ang;
int sdo, mdo, hdo, old_M, old_H, hh, mm, ss;
int delay = 1000;
Calendar now;
String st, alarm, Items1, Items2,str[];
JButton jb;
JComboBox jc1, jc2, jc3;
JLabel jl1, jl2, jl3, jl4;
JMenu jm1, jm2, jm3, jm4;
JMenuBar jmb;
JMenuItem jmi1, jmi2, jmi3, jmi4, jmi5, jmi6, jmi7, jmi8, jmi9,jmi10;
JTextField jtf1, jtf2, time;
JPanel jp1, jp2, jp3;
Timer timer;
TimeZone tz = TimeZone.getTimeZone("JST");
Toolkit toolkit=Toolkit.getDefaultToolkit();;
/**
* br
* 方法说明：实现ActionListener类必须过载的方法
*/
public static void main(String[] args) {
Clock cp = new Clock();
cp.setVisible(true);
}
Clock() {
super("Java闹钟！");
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setSize(550, 700);
setVisible(true);
Container contentPane = getContentPane();
jp2 = new JPanel();
jmb = new JMenuBar();
jm1 = new JMenu("背景颜色设置 ", true);
jmi1 = new JMenuItem("外圈颜色");
jmi1.addActionListener(this);
jmi1.setActionCommand("color1");
jm1.add(jmi1);
jmi2 = new JMenuItem("闹钟边线颜色");
jmi2.addActionListener(this);
jmi2.setActionCommand("color2");
jm1.add(jmi2);
jmi3=new JMenuItem("底盘颜色");
jmi3.addActionListener(this);
jmi3.setActionCommand("color3");
jm1.add(jmi3);
jmi4=new JMenuItem("系统时间背静颜色");
jmi4.addActionListener(this);
jmi4.setActionCommand("color4");
jm1.add(jmi4);
jmb.add(jm1);
jm2 = new JMenu("指针颜色设置 ", true);
jmi5 = new JMenuItem("秒针颜色");
jmi5.addActionListener(this);
jmi5.setActionCommand("color5");
jm2.add(jmi5);
jmi6 = new JMenuItem("分针颜色");
jmi6.addActionListener(this);
jmi6.setActionCommand("color6");
jm2.add(jmi6);
jmi7 = new JMenuItem("时针颜色");
jmi7.addActionListener(this);
jmi7.setActionCommand("color7");
jm2.add(jmi7);
jmb.add(jm2);
jm3 = new JMenu("闹铃声音设置 ", true);
jmi8 = new JMenuItem("响铃1");
jmi8.addActionListener(this);
jmi8.setActionCommand("ring1");
jm3.add(jmi8);
jmi9 = new JMenuItem("静音");
jmi9.addActionListener(this);
jmi9.setActionCommand("ring2");
jm3.add(jmi9);
jmb.add(jm3);
jm4 = new JMenu("帮助 ", true);
jmi10=new JMenuItem("使用说明");
jmi10.addActionListener(this);
jmi10.setActionCommand("help");
jm4.add(jmi10);
jmb.add(jm4);
jp2.add(jmb);
contentPane.add(jp2, BorderLayout.NORTH);
jp3 = new JPanel();
jl1 = new JLabel("闹铃时间");
jl1.setFont(new Font("楷体_GB2312", Font.BOLD, 18));
time = new JTextField("00:00", 5);
alarm = time.getText();
jb = new JButton("修改闹铃时间");
jb.addActionListener(this);
jb.setActionCommand("CC");
jp3.add(jl1);
jp3.add(time);
jp3.add(jb);
contentPane.add(jp3, BorderLayout.SOUTH);
ClockPanel clock = new ClockPanel();
contentPane.add(clock, BorderLayout.CENTER);
// 窗体添加事件监听，监听秒表的触发
ActionListener taskPerformer = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
repaint();
}
};
new Timer(delay, taskPerformer).start();
}
/**
* br
* 方法说明：绘制图形
*/
Color C1 = Color.lightGray;// 外圈颜色
Color C2 = Color.black;// 边线颜色
Color C3 = Color.magenta;// 内盘颜色
Color C4 = Color.blue;// 背景颜色
Color C5 = Color.yellow;// 秒针颜色
Color C6 = Color.green;// 分针颜色
Color C7 = Color.red;//时针颜色
public class ClockPanel extends JPanel {
public void paint(Graphics g) {
h = getSize().height - 200;
// 绘制圆形
g.setColor(C1);
g.fillOval(L0 + 30, T0 + 30, h - 60, h - 60);
g.setColor(C2);
g.drawOval(L0 + 31, T0 + 31, h - 62, h - 62);
g.setColor(C3);
g.fillOval(L0 + 50, T0 + 50, h - 100, h - 100);
g.setColor(C2);
g.drawOval(L0 + 51, T0 + 51, h - 102, h - 102);
r = h / 2 - 30;
x0 = 30 + r - 5 + L0;
y0 = 30 + r - 5 - T0;
ang = 60;
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;
}
x0 = 30 + r + L0;
y0 = 30 + r + T0;
g.drawString("指针式时钟", 215, 200);
// 获取时间
now = Calendar.getInstance();
hh = now.get(Calendar.HOUR_OF_DAY);// 小时
mm = now.get(Calendar.MINUTE);// 分钟
ss = now.get(Calendar.SECOND);// 秒
g.setColor(C4);
g.fillRect(5, 550, 150, 30);// 填充的矩形
g.setColor(C6);
if (hh 10)
st = "0" + hh;
else
st = "" + hh;
if (mm 10)
st = st + ":0" + mm;
else
st = st + ":" + mm;
if(alarm.equals(st))
{
if(toolkit!=null)
toolkit.beep();
else {}
}
if (ss 10)
st = st + ":0" + ss;
else
st = st + ":" + ss;
{
g.setFont(new Font("华文楷体", Font.BOLD, 16));
g.drawString("系统时间:" + st, 10, 570);
}
// 计算时间和图形的关系
sdo = 90 - ss * 6;
mdo = 90 - mm * 6;
hdo = 90 - hh * 30 - mm / 2;
// 擦除秒针
if (old_X 0) {
g.setColor(C3);
} else {
old_M = mdo;
old_H = hdo;
}
// 绘制秒针
g.setColor(C5);
x = (int) ((r - 26) * Math.cos(RAD * sdo) + x0);
y = (int) ((r - 26) * Math.sin(RAD * sdo) + y0) - 2 * T0;
g.drawLine(x0, y0, x, (h - y));
old_X = x;
old_Y = y;
// 擦除分针和时针
if (mdo != old_M) {
g.setColor(C3);
old_M = mdo;
}
if (hdo != old_H) {
g.setColor(C3);
old_H = hdo;
}
// 绘制分针
g.setColor(C6);
x = (int) ((r - 50) * Math.cos(RAD * mdo) + x0);
y = (int) ((r - 50) * Math.sin(RAD * mdo) + y0) - 2 * T0;
g.drawLine(x0, y0, x, (h - y));
// 绘制时针
g.setColor(C7);
x = (int) ((r - 90) * Math.cos(RAD * hdo) + x0);
y = (int) ((r - 90) * Math.sin(RAD * hdo) + y0) - 2 * T0;
g.drawLine(x0, y0, x, (h - y));
} // end paint
}
// 闹铃时间的判断及实现
// 闹铃声音的实现
public void actionPerformed(ActionEvent e) {
// JMenuItem m = (JMenuItem) e.getSource();
if (e.getActionCommand() == "CC") {
int newHou, newMin;
char c;
String getTime = JOptionPane.showInputDialog(this, "请输入闹铃时间格式如：", "00:00");
repaint();
//如果撤消设置时间，就什么打印null
if(getTime==null)
System.out.println(getTime);
// dispose();
judge: if (getTime != null) {
//打印输入的设置的时间
System.out.println(getTime);
// 判断输入的是不是5位字符
if (getTime.length() != 5) {
JOptionPane.showMessageDialog(time, "格式错误\n请按格式输入5位数字", "Error",
JOptionPane.ERROR_MESSAGE);
repaint();
break judge;
}
// 判断输入的是不是数字
for (int i = 0; i (getTime.length()); i++) {
c = getTime.charAt(i);
if (i == 2 !Character.isDigit(c))
continue;
// 判断当前字符,如果不是数字则跳出该事件
if (i != 2 !Character.isDigit(c)) {
JOptionPane.showMessageDialog(this, "格式错误\n请按格式输入5位数字",
"Error",JOptionPane.ERROR_MESSAGE);
repaint();
break judge;
}
}
char[] hour = { getTime.charAt(0), getTime.charAt(1) };
char[] minute = { getTime.charAt(3), getTime.charAt(4) };
newHou = Integer.parseInt(String.valueOf(hour));
newMin = Integer.parseInt(String.valueOf(minute));
if (newHou = 24 || newHou 0) {
JOptionPane.showMessageDialog(this, "格式错误\n小时应该是不小于0不大于23的正数",
"Error", JOptionPane.ERROR_MESSAGE);
repaint();
break judge;
}
if (newMin = 60 || newHou 0) {
JOptionPane.showMessageDialog(this, "格式错误\n分钟应该是小于60的正数", "Error",
JOptionPane.ERROR_MESSAGE);
repaint();
break judge;
}
new SetTime(newHou, newMin);
}
}
if (e.getActionCommand() == "ring1") {
toolkit=Toolkit.getDefaultToolkit();
}
if(e.getActionCommand() == "ring2"){
System.out.println("静音");
toolkit=null;
}
if (e.getActionCommand() == "color1") {
String color;
Color c;
System.out.println("color1");
color = JOptionPane.showInputDialog(this, "请输入喜欢的外圈颜色（0--255）", "128");
if (color == null) {
} else {
if (Integer.parseInt(color) 0
|| Integer.parseInt(color) 255)
JOptionPane.showInputDialog(this, "请输入喜欢的外圈颜色（0--255）", "128");
else {
c = new Color(Integer.parseInt(color));
C1 = c;
}
}
}
if(e.getActionCommand() == "color2"){
String color;
Color c;
System.out.println("color2");
color = JOptionPane.showInputDialog(this, "请输入喜欢的边线颜色（0--255）", "128");
if(color==null){}
else{if (Integer.parseInt(color) 0|| Integer.parseInt(color) 255)
JOptionPane.showInputDialog(this, "请输入喜欢的边线颜色（0--255）", "128");
else {
c = new Color(Integer.parseInt(color));
C2 = c;
}
}
}
if(e.getActionCommand() == "color3"){
String color;
Color c;
System.out.println("color3");
color = JOptionPane.showInputDialog(this, "请输入喜欢的内盘颜色（0--255）", "128");
if(color==null){}
else{if (Integer.parseInt(color) 0|| Integer.parseInt(color) 255)
JOptionPane.showInputDialog(this, "请输入喜欢的内盘颜色（0--255）", "128");
else {
c = new Color(Integer.parseInt(color));
C3 = c;
}
}
}
if(e.getActionCommand() == "color4"){
String color;
Color c;
System.out.println("color4");
color = JOptionPane.showInputDialog(this, "请输入喜欢的背景颜色（0--255）", "128");
if(color==null){}
else{if (Integer.parseInt(color) 0|| Integer.parseInt(color) 255)
JOptionPane.showInputDialog(this, "请输入喜欢的背景颜色（0--255）", "128");
else {
c = new Color(Integer.parseInt(color));
C4 = c;
}
}
}
if(e.getActionCommand() == "color5"){
String color;
Color c;
System.out.println("color5");
color = JOptionPane.showInputDialog(this, "请输入喜欢的秒针颜色（0--255）", "128");
if(color==null){}
else{if (Integer.parseInt(color) 0|| Integer.parseInt(color) 255)
JOptionPane.showInputDialog(this, "请输入喜欢的秒针颜色（0--255）", "128");
else {
c = new Color(Integer.parseInt(color));
C5 = c;
}
}
}
if(e.getActionCommand() == "color6"){
String color;
Color c;
System.out.println("color6");
color = JOptionPane.showInputDialog(this, "请输入喜欢的分针颜色（0--255）", "128");
if(color==null){}
else{if (Integer.parseInt(color) 0|| Integer.parseInt(color) 255)
JOptionPane.showInputDialog(this, "请输入喜欢的分针颜色（0--255）", "128");
else {
c = new Color(Integer.parseInt(color));
C6 = c;
}
}
}
if(e.getActionCommand() == "color7"){
String color;
Color c;
System.out.println("color7");
color = JOptionPane.showInputDialog(this, "请输入喜欢的时针颜色（0--255）", "128");
if(color==null){}
else{if (Integer.parseInt(color) 0|| Integer.parseInt(color) 255)
JOptionPane.showInputDialog(this, "请输入喜欢的时针颜色（0--255）", "128");
else {
c = new Color(Integer.parseInt(color));
C7 = c;
}
}
}
if(e.getActionCommand() == "help"){
String help;
help = JOptionPane.showInputDialog(this, "输入quit退出该闹钟的使用", "这是运行在Java中的指针式时钟");
if(help.equals("quit"))
dispose();
else {}
// timer.restart();
}
}
class SetTime {
String Hour;
String Minute;
public SetTime() { }
public SetTime(int hour, int minute) {
// 当时间参数小于10的时候在前面添加字符0
if (hour 10) {
Hour = "0" + String.valueOf(hour);
} else {
Hour = "" + String.valueOf(hour);
}
if (minute 10) {
Minute = "0" + String.valueOf(minute);
} else {
Minute = "" + String.valueOf(minute);
}
alarm = Hour + ":" + Minute;
time.setText(alarm);
repaint();
}
}
}
import java.util.*;
import java.awt.*;
import java.applet.*;
import java.text.*;
import java.awt.event.*;
public class Alarm extends Applet implements Runnable
{
Thread timer=null; //创建线程timer
Image gif1; //clockp:闹钟的外壳，闹铃和报时物
boolean setflag=false,stopflag=false,cancelflag=false;
Panel setpanel;
//获取声音文件
AudioClip ring=getAudioClip(getCodeBase(), "1.mid");
Button setbutton=new Button("SET");
Button cancelbutton=new Button("CANCEL");
Button stopbutton=new Button("STOP");
//响应按钮事件
private ActionListener setli=new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
setflag=true;
}
};
private ActionListener cancelli=new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
setflag=true;
}
};
private ActionListener stopli=new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
ring.stop();
//清除的方法
//g.clearRect(83,280,20,30);
}
};
Label note1=new Label("Alarm clock:");
//GregorianCalendar提供的是一个日历式的东东，上面又多了很多的参数，是方便操作了不少。而Date类的功能远不及其，求个和日期有联系的还要自己计算。
GregorianCalendar cal=new GregorianCalendar();
GregorianCalendar cal2=new GregorianCalendar();
SimpleDateFormat df=new SimpleDateFormat("yyyy MM dd HH:mm:ss");//设置时间格式
Date dummy=new Date(); //生成Data对象
String lastdate=df.format(dummy);
Font F=new Font("TimesRoman",Font.PLAIN,14);//设置字体格式
Date dat=null;
Date timeNow;
Color fgcol=Color.blue;
Color fgcol2=Color.darkGray;
Color backcolor=Color.blue;
Label hlabel2,mlabel2,slabel2;//显示时间单位时所用的标签（时、分、秒）
int i;
int s,m,h;
TextField sethour,setmin,setsec;//显示当前时间文本框和定时文本框
//在Applet程序中，首先自动调用初始化完成必要的初始化工作，紧接着自动调用start，在进入执行程序和返回到该页面时被调用，而从该页面转到别的页面时，stop被调用，关闭浏览器时，执行destroy。
public void init()//初始化方法
{
int fieldx=50,fieldy1=120,fieldy2=220,fieldw=30,fieldh=20,space=50;//显示时间和定时文本框的定位参数
setLayout(null); //将布局管理器初始化为null
setpanel=new Panel();
setpanel.setLayout(null);
setpanel.add(note1);
note1.setBounds(30,100,60,20);
note1.setBackground(backcolor);
note1.setForeground(Color.black);
//定时用的文本框（时、分、秒）
sethour=new TextField("00",5);
setmin=new TextField("00",5);
setsec=new TextField("00",5);
hlabel2=new Label();
mlabel2=new Label();
slabel2=new Label();
//定时的小时文本框的位置、大小
setpanel.add(sethour);
sethour.setBounds(fieldx,fieldy2,fieldw,fieldh);
sethour.setBackground(Color.white);
//在文本框后加入单位“时”
setpanel.add(hlabel2);
hlabel2.setText("h");
hlabel2.setBackground(backcolor);
hlabel2.setForeground(Color.black);
hlabel2.setBounds(fieldx+fieldw+3,fieldy2,14,20);
fieldx=fieldx+space;
//定时的分钟文本框的位置、大小
setpanel.add(setmin);
setmin.setBounds(fieldx,fieldy2,fieldw,fieldh);
setmin.setBackground(Color.white);
//在文本框后加入单位“分”
setpanel.add(mlabel2);
mlabel2.setText("m");
mlabel2.setBackground(backcolor);
mlabel2.setForeground(Color.black);
mlabel2.setBounds(fieldx+fieldw+3,fieldy2,14,20);
fieldx=fieldx+space;
//定时的秒文本框的位置、大小
setpanel.add(setsec);
setsec.setBounds(fieldx,fieldy2,fieldw,fieldh);
setsec.setBackground(Color.white);
//在文本框后加入单位“秒”
setpanel.add(slabel2);
slabel2.setText("s");
slabel2.setBackground(backcolor);
slabel2.setForeground(Color.black);
slabel2.setBounds(fieldx+fieldw+3,fieldy2,14,20);
//设置闹钟控制按钮（on,off)
setpanel.add(cancelbutton);
setpanel.add(setbutton);
setpanel.add(stopbutton);
cancelbutton.setBounds(90,180,40,20);
setbutton.setBounds(140,180,40,20);
stopbutton.setBounds(522,180,40,20);
setbutton.addActionListener(setli);
cancelbutton.addActionListener(cancelli);
stopbutton.addActionListener(stopli);
stopbutton.setVisible(false);
//将面板加入当前容器中，并设置面板的大小和背景色
add(setpanel);
setpanel.setBounds(300,1,250,420);
setpanel.setBackground(backcolor);
/*int xcenter,ycenter,s,m,h;
//闹钟中心点所在位置
xcenter=145;
ycenter=162;
s=(int)cal.get(Calendar.SECOND);
m=(int)cal.get(Calendar.MINUTE);
h=(int)cal.get(Calendar.HOUR_OF_DAY);
//初始化指针位置
lastxs=(int)(Math.cos(s*3.14f/30-3.14f/2)*30+xcenter);
lastys=(int)(Math.sin(s*3.14f/30-3.14f/2)*30+ycenter);
lastxm=(int)(Math.cos(m*3.14f/30-3.14f/2)*25+xcenter);
lastym=(int)(Math.sin(m*3.14f/30-3.14f/2)*25+ycenter);
lastxh=(int)(Math.cos((h*30+m/2)*3.14f/180-3.14f/2)*18+xcenter);
lastyh=(int)(Math.sin((h*30+m/2)*3.14f/180-3.14f/2)*18+ycenter);
lasts=s; */
MediaTracker mt=new MediaTracker(this);//为给定组件创建一个跟踪媒体的MediaTracker对象，把图片添加到被跟踪的图片组
//Java允?Sapplet??HTML所在的位置(decument base)下?d?Y料，也允?Sapplet?钠涑淌酱a所在的位置(code base)下?d?Y料。藉由呼叫getDocumentBase()?cgotCodeBase()可得到URL物件。?@些函?????湍阏业侥阆胂螺d的?n案的位置
//clockp=getImage(getDocumentBase(),"11.png");
gif1=getImage(getCodeBase(),"2.gif");
//i为id号
mt.addImage(gif1,i++);
try
{
mt.waitForAll();
}
catch(InterruptedException e)
{};//等待加载结束
resize(600,420);//设置窗口大小
}
//窗口显示有改变的时候调用paint
public void paint(Graphics g)
{//重写paint()方法
int xh,yh,xm,ym,xs,ys,strike_times;
int xcenter,ycenter;
String today;
xcenter=148;
ycenter=186;
dat=new Date();
//用当前时间初始化日历时间
cal.setTime(dat);
//读取当前时间
s=(int)cal.get(Calendar.SECOND);
m=(int)cal.get(Calendar.MINUTE);
h=(int)cal.get(Calendar.HOUR_OF_DAY);
//换一种时间表达形式
today=df.format(dat);
//指针位置
xs=(int)(Math.cos(s*3.14f/30-3.14f/2)*30+xcenter);
ys=(int)(Math.sin(s*3.14f/30-3.14f/2)*30+ycenter);
xm=(int)(Math.cos(m*3.14f/30-3.14f/2)*25+xcenter);
ym=(int)(Math.sin(m*3.14f/30-3.14f/2)*25+ycenter);
xh=(int)(Math.cos((h*30+m/2)*3.14f/180-3.14f/2)*12+xcenter);
yh=(int)(Math.sin((h*30+m/2)*3.14f/180-3.14f/2)*12+ycenter);
//设置字体和颜色
g.setFont(F);
//前景色
g.setColor(getBackground()); //取背景色的
g.drawImage(gif1,75,110,this);
//以数字方式显示年、月、日和时间
g.drawString(today,55,415);
//画指针
g.drawLine(xcenter,ycenter,xs,ys);
g.drawLine(xcenter,ycenter-1,xm,ym); //(x1,y1,x2,y2)
g.drawLine(xcenter-1,ycenter,xm,ym);
g.drawLine(xcenter,ycenter-1,xh,yh);
g.drawLine(xcenter-1,ycenter,xh,yh);
int timedelta;//记录当前时间与闹铃定时的时差
Integer currh,currm,currs;//分别记录当前的时、分、秒
Date dat2=new Date();
cal2.setTime(dat2);
//读取当前时间
currh=(int)cal2.get(Calendar.SECOND);
currm=(int)cal2.get(Calendar.MINUTE);
currs=(int)cal2.get(Calendar.HOUR_OF_DAY);
//这样做的话说我API已过时
//timeNow=new Date();
//currh=new Integer(timeNow.getHours());
//currm=new Integer(timeNow.getMinutes());
//currs=new Integer(timeNow.getSeconds());
if(setflag)
{ //判断是否设置了闹钟
//判断当前时间是否为闹钟所定的时间
if((currh.intValue()==Integer.valueOf(sethour.getText()).intValue())(currm.intValue()==Integer.valueOf(setmin.getText()).intValue())(currs.intValue()==Integer.valueOf(setsec.getText()).intValue()))
{
ring.play();
g.drawImage(gif1,83,280,this);
stopbutton.setVisible(true);
}
timedelta=currm.intValue()*60+currs.intValue()-Integer.valueOf(setmin.getText()).intValue()*60-Integer.valueOf(setsec.getText()).intValue();
if((timedelta=30))
{
//若当前时间与闹钟相差时间超过30秒，闹钟自动停
ring.stop();
//清除的方法
g.clearRect(83,280,20,30);
}
}
dat=null;
}
public void start()
{
if(timer==null)
{
timer=new Thread(this);//将timer实例化
timer.start();
}
}
public void stop()
{
timer=null;
}
//给创建线程后start之后自动执行的函数
public void run()
{
//在run()方法中，调用repaint()方法，以重绘小程序区，进行时钟显示的更新。接着调用sleep方法让当前线程（也就是我们创建的线程clockthread）睡眠1000毫秒，因为我们每秒钟要更新一下显示，所以让它睡眠1秒
while(timer!=null)
{
try
{
timer.sleep(1000);
}
catch(InterruptedException e)
{}
//调用repaint时，会首先清除掉paint方法之前的画的内容，再调用paint方法
repaint();//刷新画面
}
timer=null;
}
//当AWT接收到一个applet的重绘请求时，它就调用applet的 update()，默认地，update() 清除applet的背景，然后调用 paint()。重载 update()，将以前在paint()中的绘图代码包含在update()中，从而避免每次重绘时将整个区域清除
//有两种方法可以明显地减弱闪烁：重载 update()或使用双缓冲。
//使用双缓冲技术:另一种减小帧之间闪烁的方法是使用双缓冲，它在许多动画Applet中被使用。其主要原理是创建一个后台图像，将需要绘制的一帧画入图像，然后调用DrawImage()将整个图像一次画到屏幕上去；好处是大部分绘制是离屏的，将离屏图像一次绘至屏幕上比直接在屏幕上绘制要有效得多，大大提高做图的性能。
// 双缓冲可以使动画平滑，但有一个缺点，要分配一张后台图像，如果图像相当大，这将需要很大一块内存；当你使用双缓冲技术时，应重载 update()。
public void update(Graphics g)
{
Image offscreen_buf=null;
//采用双缓冲技术的update()方法
if(offscreen_buf==null)
offscreen_buf=createImage(600,420);
Graphics offg=offscreen_buf.getGraphics();
offg.clipRect(1,1,599,419);
paint(offg);
Graphics ong=getGraphics();
ong.clipRect(1,1,599,419);
ong.drawImage(offscreen_buf,0,0,this);
}
/** Creates a new instance of AlarmClock */
}
搞不懂为什么要匿名提问，真的那么怕笑话，不至于吧！
import java.util.Timer;
import java.util.Date;
import java.text.SimpleDateFormat;
public class Alarm
{
public static void main(String[] args)
{
Timer timer = new Timer();
try{
timer.schedule(new task(),1000,1000);
}
catch(IllegalStateException e)
{
System.out.println("时间到");
}
}
static class task extends java.util.TimerTask
{
public void run()
{
Date now = new Date();
SimpleDateFormat time = new SimpleDateFormat("HH:mm:ss");
if(time.format(now).toString.equals("23:27:00"))
this.cancel();
else
System.out.println(time.format(now));
}
}
}
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.Timer;
public class Test extends JFrame implements ActionListener{
Timer t=new Timer(1000,this);
GregorianCalendar calendar=new GregorianCalendar();
JLabel label1=new JLabel(new Date().toString()),
label2=new JLabel("
");
public Test(){
super("TIME");
Container c=this.getContentPane();
c.setLayout(new FlowLayout());
c.add(label1);c.add(label2);
t.start();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setBounds(200,200,200,100);
this.setVisible(true);
}
public void actionPerformed(ActionEvent e){
Date date=new Date();
calendar.setTime(date);
if(e.getSource()==t){
label1.setText(date.toString());
if(calendar.get(Calendar.MINUTE)==0)//当分钟为0报时
if(calendar.get(Calendar.SECOND)=5){//持续5秒报时
if(calendar.get(Calendar.SECOND)%2==0)
label2.setText("现在是北京时间"+calendar.get(Calendar.HOUR_OF_DAY)+"点整。");
if(calendar.get(Calendar.SECOND)%2==1)
label2.setText("
");
}
}
}
public static void main (String[] args) {
new Test();
}
}