找下你jdk安装目录下的demo里的clock里面就有你要的代码; import java.util.*; import java.awt.*; import java.applet.*; import java.text.*;/** * Time! * * @author Rachel Gollub * @modified Daniel Peek replaced circle drawing calculation, few more changes */ public class Clock extends Applet implements Runnable { private volatile Thread timer; // The thread that displays clock private int lastxs, lastys, lastxm, lastym, lastxh, lastyh; // Dimensions used to draw hands private SimpleDateFormat formatter; // Formats the date displayed private String lastdate; // String to hold date displayed private Font clockFaceFont; // Font for number display on clock private Date currentDate; // Used to get date to display private Color handColor; // Color of main hands and dial private Color numberColor; // Color of second hand and numbers private int xcenter = 80, ycenter = 55; // Center position public void init() { int x,y; lastxs = lastys = lastxm = lastym = lastxh = lastyh = 0; formatter = new SimpleDateFormat ("EEE MMM dd hh:mm:ss yyyy", Locale.getDefault()); currentDate = new Date(); lastdate = formatter.format(currentDate); clockFaceFont = new Font("Serif", Font.PLAIN, 14); handColor = Color.blue; numberColor = Color.darkGray; try { setBackground(new Color(Integer.parseInt(getParameter("bgcolor"), 16))); } catch (NullPointerException e) { } catch (NumberFormatException e) { } try { handColor = new Color(Integer.parseInt(getParameter("fgcolor1"), 16)); } catch (NullPointerException e) { } catch (NumberFormatException e) { } try { numberColor = new Color(Integer.parseInt(getParameter("fgcolor2"), 16)); } catch (NullPointerException e) { } catch (NumberFormatException e) { } resize(300,300); // Set clock window size } // Paint is the main part of the program public void update(Graphics g) { int xh, yh, xm, ym, xs, ys; int s = 0, m = 10, h = 10; String today; currentDate = new Date();
formatter.applyPattern("s"); try { s = Integer.parseInt(formatter.format(currentDate)); } catch (NumberFormatException n) { s = 0; } formatter.applyPattern("m"); try { m = Integer.parseInt(formatter.format(currentDate)); } catch (NumberFormatException n) { m = 10; } formatter.applyPattern("h"); try { h = Integer.parseInt(formatter.format(currentDate)); } catch (NumberFormatException n) { h = 10; }
// Get the date to print at the bottom formatter.applyPattern("EEE MMM dd HH:mm:ss yyyy"); today = formatter.format(currentDate); g.setFont(clockFaceFont); // Erase if necessary g.setColor(getBackground()); if (xs != lastxs || ys != lastys) { g.drawLine(xcenter, ycenter, lastxs, lastys); g.drawString(lastdate, 5, 125); } if (xm != lastxm || ym != lastym) { g.drawLine(xcenter, ycenter-1, lastxm, lastym); g.drawLine(xcenter-1, ycenter, lastxm, lastym); } if (xh != lastxh || yh != lastyh) { g.drawLine(xcenter, ycenter-1, lastxh, lastyh); g.drawLine(xcenter-1, ycenter, lastxh, lastyh); } // Draw date and hands g.setColor(numberColor); g.drawString(today, 5, 125); g.drawLine(xcenter, ycenter, xs, ys); g.setColor(handColor); g.drawLine(xcenter, ycenter-1, xm, ym); g.drawLine(xcenter-1, ycenter, xm, ym); g.drawLine(xcenter, ycenter-1, xh, yh); g.drawLine(xcenter-1, ycenter, xh, yh); lastxs = xs; lastys = ys; lastxm = xm; lastym = ym; lastxh = xh; lastyh = yh; lastdate = today; currentDate = null; } public void paint(Graphics g) { g.setFont(clockFaceFont); // Draw the circle and numbers g.setColor(handColor); g.drawArc(xcenter-50, ycenter-50, 100, 100, 0, 360); g.setColor(numberColor); g.drawString("9", xcenter-45, ycenter+3); g.drawString("3", xcenter+40, ycenter+3); g.drawString("12", xcenter-5, ycenter-37); g.drawString("6", xcenter-3, ycenter+45); // Draw date and hands g.setColor(numberColor); g.drawString(lastdate, 5, 125); g.drawLine(xcenter, ycenter, lastxs, lastys); g.setColor(handColor); g.drawLine(xcenter, ycenter-1, lastxm, lastym); g.drawLine(xcenter-1, ycenter, lastxm, lastym); g.drawLine(xcenter, ycenter-1, lastxh, lastyh); g.drawLine(xcenter-1, ycenter, lastxh, lastyh); } public void start() { timer = new Thread(this); timer.start(); } public void stop() { timer = null; } public void run() { Thread me = Thread.currentThread(); while (timer == me) { try { Thread.currentThread().sleep(100); } catch (InterruptedException e) { } repaint(); } } public String getAppletInfo() { return "Title: A Clock \n" + "Author: Rachel Gollub, 1995 \n" + "An analog clock."; }
public String[][] getParameterInfo() { String[][] info = { {"bgcolor", "hexadecimal RGB number", "The background color. Default is the color of your browser."}, {"fgcolor1", "hexadecimal RGB number", "The color of the hands and dial. Default is blue."}, {"fgcolor2", "hexadecimal RGB number", "The color of the second hand and numbers. Default is dark gray."} }; return info; } }
import java.awt.*;
import java.applet.*;public class Clock2 extends Applet implements Runnable {
Thread timer = null;
int lastxs=0, lastys=0, lastxm=0, lastym=0, lastxh=0, lastyh=0;
//定义并初始化lastxs,lastys,lastxm,lastym,lastxh,lastyh
Date dummy = new Date();
String lastdate = dummy.toLocaleString();public void init() {
int x,y;
resize(300,300); // 确定钟面大小
} // 当转过45度时,绘制时,分,秒针位置public void plotpoints(int x0, int y0, int x, int y, Graphics g) { g.drawLine(x0+x,y0+y,x0+x,y0+y);
g.drawLine(x0+y,y0+x,x0+y,y0+x);
g.drawLine(x0+y,y0-x,x0+y,y0-x);
g.drawLine(x0+x,y0-y,x0+x,y0-y);
g.drawLine(x0-x,y0-y,x0-x,y0-y);
g.drawLine(x0-y,y0-x,x0-y,y0-x);
g.drawLine(x0-y,y0+x,x0-y,y0+x);
g.drawLine(x0-x,y0+y,x0-x,y0+y);
} // Circle是 用 Bresenham 算法实现的一个圆public void circle(int x0, int y0, int r, Graphics g) {
int x,y;
float d; x=0;
y=r;
d=5/4-r;
plotpoints(x0,y0,x,y,g); while (y>x){
if (d<0) {
d=d+2*x+3;
x++;
}
else {
d=d+2*(x-y)+5;
x++;
y--;
}
plotpoints(x0,y0,x,y,g);
}
}
// Paint 方法用来显示屏幕信息public void paint(Graphics g) {
int xh, yh, xm, ym, xs, ys, s, m, h, xcenter, ycenter;
String today;
Date dat = new Date(); s = dat.getSeconds(); //取系统时间
m = dat.getMinutes();
h = dat.getHours();
today = dat.toLocaleString();
xcenter=80; //确定圆心的坐标位置
ycenter=55; // a= s* pi/2 - pi/2 (to switch 0,0 from 3:00 to 12:00)
// x = r(cos a) + xcenter, y = r(sin a) + ycenter
//计算时针,分针,秒针的坐标位置
xs = (int)(Math.cos(s * 3.14f/30 - 3.14f/2) * 45 + xcenter);
ys = (int)(Math.sin(s * 3.14f/30 - 3.14f/2) * 45 + ycenter);
xm = (int)(Math.cos(m * 3.14f/30 - 3.14f/2) * 40 + xcenter);
ym = (int)(Math.sin(m * 3.14f/30 - 3.14f/2) * 40 + ycenter);
xh = (int)(Math.cos((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 30 + xcenter);
yh = (int)(Math.sin((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 30 + ycenter); // 显示圆和数字 g.setFont(new Font("TimesRoman", Font.PLAIN, 14));
g.setColor(Color.blue); //设置颜色
circle(xcenter,ycenter,50,g); //确定圆的坐标位置
g.setColor(Color.blue);
g.drawString("9",xcenter-45,ycenter+3); //确定数字的位置
g.drawString("3",xcenter+40,ycenter+3);
g.drawString("12",xcenter-5,ycenter-37);
g.drawString("6",xcenter-3,ycenter+45); //刷新,重绘 g.setColor(getBackground());
if (xs != lastxs || ys != lastys) {
g.drawLine(xcenter, ycenter, lastxs, lastys);
g.drawString(lastdate, 5, 125);
}
if (xm != lastxm || ym != lastym) {
g.drawLine(xcenter, ycenter-1, lastxm, lastym);
g.drawLine(xcenter-1, ycenter, lastxm, lastym); }
if (xh != lastxh || yh != lastyh) {
g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
g.drawLine(xcenter-1, ycenter, lastxh, lastyh); }
g.setColor(Color.darkGray);
g.drawString(today, 5, 125);
g.drawLine(xcenter, ycenter, xs, ys);
g.setColor(Color.blue);
g.drawLine(xcenter, ycenter-1, xm, ym);
g.drawLine(xcenter-1, ycenter, xm, ym);
g.drawLine(xcenter, ycenter-1, xh, yh);
g.drawLine(xcenter-1, ycenter, xh, yh);
lastxs=xs; lastys=ys;
lastxm=xm; lastym=ym;
lastxh=xh; lastyh=yh;
lastdate = today;
}public void start() { //start方法,用来建立新线程
if(timer == null)
{
timer = new Thread(this);
timer.start();
}
}public void stop() {
timer = null;
}public void run() { //run方法,用来控制线程运行
while (timer != null) {
try {Thread.sleep(100);} catch (InterruptedException e){}//抛出异常
repaint();
}
timer = null;
}
//显示屏幕信息
public void update(Graphics g) {
paint(g);
}
}
import java.util.*;
import java.awt.*;
import java.applet.*;
import java.text.*;/**
* Time!
*
* @author Rachel Gollub
* @modified Daniel Peek replaced circle drawing calculation, few more changes
*/
public class Clock extends Applet implements Runnable {
private volatile Thread timer; // The thread that displays clock
private int lastxs, lastys, lastxm,
lastym, lastxh, lastyh; // Dimensions used to draw hands
private SimpleDateFormat formatter; // Formats the date displayed
private String lastdate; // String to hold date displayed
private Font clockFaceFont; // Font for number display on clock
private Date currentDate; // Used to get date to display
private Color handColor; // Color of main hands and dial
private Color numberColor; // Color of second hand and numbers
private int xcenter = 80, ycenter = 55; // Center position public void init() {
int x,y;
lastxs = lastys = lastxm = lastym = lastxh = lastyh = 0;
formatter = new SimpleDateFormat ("EEE MMM dd hh:mm:ss yyyy",
Locale.getDefault());
currentDate = new Date();
lastdate = formatter.format(currentDate);
clockFaceFont = new Font("Serif", Font.PLAIN, 14);
handColor = Color.blue;
numberColor = Color.darkGray; try {
setBackground(new Color(Integer.parseInt(getParameter("bgcolor"),
16)));
} catch (NullPointerException e) {
} catch (NumberFormatException e) {
}
try {
handColor = new Color(Integer.parseInt(getParameter("fgcolor1"),
16));
} catch (NullPointerException e) {
} catch (NumberFormatException e) {
}
try {
numberColor = new Color(Integer.parseInt(getParameter("fgcolor2"),
16));
} catch (NullPointerException e) {
} catch (NumberFormatException e) {
}
resize(300,300); // Set clock window size
} // Paint is the main part of the program
public void update(Graphics g) {
int xh, yh, xm, ym, xs, ys;
int s = 0, m = 10, h = 10;
String today; currentDate = new Date();
formatter.applyPattern("s");
try {
s = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
s = 0;
}
formatter.applyPattern("m");
try {
m = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
m = 10;
}
formatter.applyPattern("h");
try {
h = Integer.parseInt(formatter.format(currentDate));
} catch (NumberFormatException n) {
h = 10;
}
// Set position of the ends of the hands
xs = (int) (Math.cos(s * Math.PI / 30 - Math.PI / 2) * 45 + xcenter);
ys = (int) (Math.sin(s * Math.PI / 30 - Math.PI / 2) * 45 + ycenter);
xm = (int) (Math.cos(m * Math.PI / 30 - Math.PI / 2) * 40 + xcenter);
ym = (int) (Math.sin(m * Math.PI / 30 - Math.PI / 2) * 40 + ycenter);
xh = (int) (Math.cos((h*30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30
+ xcenter);
yh = (int) (Math.sin((h*30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30
+ ycenter);
// Get the date to print at the bottom
formatter.applyPattern("EEE MMM dd HH:mm:ss yyyy");
today = formatter.format(currentDate); g.setFont(clockFaceFont);
// Erase if necessary
g.setColor(getBackground());
if (xs != lastxs || ys != lastys) {
g.drawLine(xcenter, ycenter, lastxs, lastys);
g.drawString(lastdate, 5, 125);
}
if (xm != lastxm || ym != lastym) {
g.drawLine(xcenter, ycenter-1, lastxm, lastym);
g.drawLine(xcenter-1, ycenter, lastxm, lastym);
}
if (xh != lastxh || yh != lastyh) {
g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
g.drawLine(xcenter-1, ycenter, lastxh, lastyh);
} // Draw date and hands
g.setColor(numberColor);
g.drawString(today, 5, 125);
g.drawLine(xcenter, ycenter, xs, ys);
g.setColor(handColor);
g.drawLine(xcenter, ycenter-1, xm, ym);
g.drawLine(xcenter-1, ycenter, xm, ym);
g.drawLine(xcenter, ycenter-1, xh, yh);
g.drawLine(xcenter-1, ycenter, xh, yh);
lastxs = xs; lastys = ys;
lastxm = xm; lastym = ym;
lastxh = xh; lastyh = yh;
lastdate = today;
currentDate = null;
} public void paint(Graphics g) {
g.setFont(clockFaceFont);
// Draw the circle and numbers
g.setColor(handColor);
g.drawArc(xcenter-50, ycenter-50, 100, 100, 0, 360);
g.setColor(numberColor);
g.drawString("9", xcenter-45, ycenter+3);
g.drawString("3", xcenter+40, ycenter+3);
g.drawString("12", xcenter-5, ycenter-37);
g.drawString("6", xcenter-3, ycenter+45); // Draw date and hands
g.setColor(numberColor);
g.drawString(lastdate, 5, 125);
g.drawLine(xcenter, ycenter, lastxs, lastys);
g.setColor(handColor);
g.drawLine(xcenter, ycenter-1, lastxm, lastym);
g.drawLine(xcenter-1, ycenter, lastxm, lastym);
g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
g.drawLine(xcenter-1, ycenter, lastxh, lastyh);
} public void start() {
timer = new Thread(this);
timer.start();
} public void stop() {
timer = null;
} public void run() {
Thread me = Thread.currentThread();
while (timer == me) {
try {
Thread.currentThread().sleep(100);
} catch (InterruptedException e) {
}
repaint();
}
} public String getAppletInfo() {
return "Title: A Clock \n"
+ "Author: Rachel Gollub, 1995 \n"
+ "An analog clock.";
}
public String[][] getParameterInfo() {
String[][] info = {
{"bgcolor", "hexadecimal RGB number",
"The background color. Default is the color of your browser."},
{"fgcolor1", "hexadecimal RGB number",
"The color of the hands and dial. Default is blue."},
{"fgcolor2", "hexadecimal RGB number",
"The color of the second hand and numbers. Default is dark gray."}
};
return info;
}
}
那Date中的相关数据,比如getSecond()得到的在每次启动程序后就不回变话了是不是?