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java中如何获取时区？
//我实现一个时钟窗口程序给你了，好让你更容易理解，希望对你有帮助。
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import java.awt.*;
import java.awt.event.*;
import java.util.*;
//世界时钟
public class TimerTest {
public static void main(String[] args) {
new TimerTestFrame("世界时钟");
}
}
class TimerTestFrame extends Frame {
/**
*
*/
private static final long serialVersionUID = 1L;
public TimerTestFrame(String s) {
super(s);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
dispose();
System.exit(0);
}
});
setLayout(new GridLayout(2, 6));
ClockCanvas clk1 = new ClockCanvas("北京", "GMT+8"); // 创建时钟
ClockCanvas clk2 = new ClockCanvas("巴黎", "GMT+2");
ClockCanvas clk3 = new ClockCanvas("华盛顿", "GMT-4");
ClockCanvas clk4 = new ClockCanvas("洛衫矶", "GMT-7");
ClockCanvas clk5 = new ClockCanvas("伦敦", "GMT+1");
ClockCanvas clk6 = new ClockCanvas("芝加哥", "GMT-5");
add(clk1);
add(clk2);
add(clk3);
add(clk4);
add(clk5);
add(clk6);
setSize(500, 350); // 设置框架宽高
setVisible(true);
}
}
class ClockCanvas extends Canvas implements Runnable {
/**
*
*/
private static final long serialVersionUID = 1L;
private int seconds = 0;
private String city;
private GregorianCalendar calendar;
Thread t;
public ClockCanvas(String c, String tz) {
city = c;
//也可以通过TimeZone.setTimeZone(String n)函数改变时区，n为时区参数名。
calendar = new GregorianCalendar(TimeZone.getTimeZone(tz));
t = new Thread(this);
t.start();
setSize(125, 125); // 设置画布大小
setBackground(Color.black);
}
// 重写父类的方法绘制时钟图形
public void paint(Graphics g) {
Graphics2Dg2d = (Graphics2D) g;
BasicStroke bstroke = new BasicStroke(2.0f);
g2d.setStroke(bstroke);
g2d.setColor(Color.green);
g2d.drawOval(0, 0, 100, 100);
bstroke = new BasicStroke(5.0f);
g2d.setStroke(bstroke);
g2d.drawLine(50, 0, 50, 5);
g2d.drawLine(0, 50, 5, 50);
g2d.drawLine(50, 95, 50, 98);
g2d.drawLine(95, 50, 98, 50);
double hourAngle = 2 * Math.PI * (seconds - 3 * 60 * 60)
/ (12 * 60 * 60);
double minuteAngle = 2 * Math.PI * (seconds - 15 * 60) / (60 * 60);
double secondAngle = 2 * Math.PI * (seconds - 15) / (60);
bstroke = new BasicStroke(5.0f);
g2d.setStroke(bstroke);
g2d.drawLine(50, 50, 50 + (int) (30 * Math.cos(hourAngle)),
50 + (int) (30 * Math.sin(hourAngle)));
bstroke = new BasicStroke(3.0f);
g2d.setStroke(bstroke);
g2d.drawLine(50, 50, 50 + (int) (40 * Math.cos(minuteAngle)),
50 + (int) (40 * Math.sin(minuteAngle)));
bstroke = new BasicStroke(1.0f);
g2d.setStroke(bstroke);
g2d.drawLine(50, 50, 50 + (int) (45 * Math.cos(secondAngle)),
50 + (int) (45 * Math.sin(secondAngle)));
g2d.setColor(Color.red);
g2d.drawString(city, 35, 115);
}
public void timeElapsed() {
//new Date()()获得当前时间
System.out.println(new Date()());
calendar.setTime(new Date()());
seconds = calendar.get(Calendar.HOUR) * 60 * 60
+ calendar.get(Calendar.MINUTE) * 60
+ calendar.get(Calendar.SECOND);
}
public void run() {
try {
while (true) {
Thread.sleep(300);
timeElapsed();
repaint();
}
} catch (InterruptedException e) {
}
}
}
java编程利用按钮实现时钟的停止和开始功能（原代码）
如下：
import java.awt.*;
import java.awt.event.*;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import java.awt.geom.*;
import java.util.*;
class Clock extends Canvas
implements ActionListener{
static JButton jb=new JButton("开始");
static JButton jb1=new JButton("暂停");
Date date;
Timer secondTime;
int hour,munite,second;
Line2D secondLine,muniteLine,hourLine;
int a,b,c;
double pointSX[]=new double[60],//用来表示秒针端点坐标的数组
pointSY[]=new double[60],
pointMX[]=new double[60], //用来表示分针端点坐标的数组
pointMY[]=new double[60],
pointHX[]=new double[60], //用来表示时针端点坐标的数组
pointHY[]=new double[60];
Clock()
{ secondTime=new Timer(1000,this);
pointSX[0]=0; //12点秒针位置
pointSY[0]=-100;
pointMX[0]=0; //12点分针位置
pointMY[0]=-90;
pointHX[0]=0; //12点时针位置
pointHY[0]=-70;
double angle=6*Math.PI/180; //刻度为6度
for(int i=0;i59;i++) //计算出各个数组中的坐标
{ pointSX[i+1]=pointSX[i]*Math.cos(angle)-Math.sin(angle)*pointSY[i];
pointSY[i+1]=pointSY[i]*Math.cos(angle)+pointSX[i]*Math.sin(angle);
pointMX[i+1]=pointMX[i]*Math.cos(angle)-Math.sin(angle)*pointMY[i];
pointMY[i+1]=pointMY[i]*Math.cos(angle)+pointMX[i]*Math.sin(angle);
pointHX[i+1]=pointHX[i]*Math.cos(angle)-Math.sin(angle)*pointHY[i];
pointHY[i+1]=pointHY[i]*Math.cos(angle)+pointHX[i]*Math.sin(angle);
}
for(int i=0;i60;i++)
{ pointSX[i]=pointSX[i]+120; //坐标平移
pointSY[i]=pointSY[i]+120;
pointMX[i]=pointMX[i]+120; //坐标平移
pointMY[i]=pointMY[i]+120;
pointHX[i]=pointHX[i]+120; //坐标平移
pointHY[i]=pointHY[i]+120;
}
secondLine=new Line2D.Double(0,0,0,0);
muniteLine=new Line2D.Double(0,0,0,0);
hourLine=new Line2D.Double(0,0,0,0);
secondTime.start(); //秒针开始计时
}
public void paint(Graphics g)
{ for(int i=0;i60;i++) //绘制表盘上的小刻度和大刻度
{ int m=(int)pointSX[i];
int n=(int)pointSY[i];
if(i%5==0)
{ g.setColor(Color.red);
g.fillOval(m-4,n-4,8,8);
}
else
{ g.setColor(Color.cyan);
g.fillOval(m-2,n-2,4,4);
}
}
g.fillOval(115,115,10,10); //钟表中心的实心圆
Graphics2D g_2d=(Graphics2D)g;
g_2d.setColor(Color.red);
g_2d.draw(secondLine);
BasicStroke bs=
new BasicStroke(3f,BasicStroke.CAP_ROUND,BasicStroke.JOIN_MITER);
g_2d.setStroke(bs);
g_2d.setColor(Color.blue);
g_2d.draw(muniteLine);
bs=new BasicStroke(6f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER);
g_2d.setStroke(bs);
g_2d.setColor(Color.green);
g_2d.draw(hourLine);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==secondTime){
date=new Date();
String s=date.toString();
hour=Integer.parseInt(s.substring(11,13));
munite=Integer.parseInt(s.substring(14,16));
second=Integer.parseInt(s.substring(17,19)); //获取时间中的秒
int h=hour%12;
a=second; //秒针端点的坐标
b=munite; //分针端点的坐标
c=h*5+munite/12; //时针端点的坐标
secondLine.setLine(120,120,(int)pointSX[a],(int)pointSY[a]);
muniteLine.setLine(120,120,(int)pointMX[b],(int)pointMY[b]);
hourLine.setLine(120,120,(int)pointHX[c],(int)pointHY[c]);
repaint();
} if(e.getSource()==jb){
secondTime.start();
}if(e.getSource()==jb1){
secondTime.stop();
}
}
public static void main(String args[]){
JFrame win=new JFrame("时钟");
JPanel jp=new JPanel();
jp.add(jb);
jp.add(jb1);
Clock clock=new Clock();
jb.addActionListener(clock);
jb1.addActionListener(clock);
win.add(clock,BorderLayout.CENTER);
win.add(jp,"South");
win.setVisible(true);
win.setSize(246,300);
win.setDefaultCloseOperation(3) ;
win.validate();
}
}
运行截图：
有问题就追问，满意请采纳。
JAVA画时钟代码
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import sun.util.calendar.Gregorian;
import java.util.Calendar;
import java.util.GregorianCalendar;
public class ClockPointer extends JFrame{
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;
public ClockPointer(){
super("Java时钟");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Image image = getToolkit().getImage("clock.gif");
setIconImage(image);
setSize(400,400);
setBackground(Color.white);
//setLocation(300,150);
this.setLocationRelativeTo(null);
setResizable(true);
int delay = 1000;
//创建一个监听事件
setVisible(true);
ActionListener drawClock = new ActionListener(){
public void actionPerformed(ActionEvent evt){
repaint();
}
};
//创建一个时间计数器，每一秒触发一次
new Timer(delay, drawClock).start();
}
java.text.SimpleDateFormat fmTime = new java.text.SimpleDateFormat("HH:mm:ss");
//绘制图形
public void paint(Graphics g){
super.paint(g);
g.setFont(null);
Graphics2D g2D = (Graphics2D)g;
Insets insets = getInsets();
int L = insets.left/2, T = insets.top/2;
h = getSize().height;
g.setColor(Color.white);
//画圆
g2D.setStroke(new BasicStroke(2.0f));
g.setColor(Color.gray);
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.setColor(Color.black);
g.drawString(""+i, x, h-y);
ang -=30;
}
//获得现在的时间
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=fmTime.format(now.getTime());
//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.setColor(Color.gray);
// g.drawLine(x0, y0, olds_x, h-olds_y); // (?)
//}
//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(3.2f));
//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){
new ClockPointer();
}
}
//整理一下
Java编写世界时钟
package Time;
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class TimerTest extends JFrame{
TimerPanel tp;
TimerTest(){
setTitle("世界时钟");
setSize(500,300);
tp=new TimerPanel();
Thread t=new Thread(tp);
t.start();
this.add(tp);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String[] args) {
new TimerTest();
}
}
class TimerPanel extends JPanel implements Runnable{
Time[] t=new Time[6];
TimerPanel(){
t[0]=new Time(0,0,"北京",8);
t[1]=new Time(150,0,"巴黎",1);
t[2]=new Time(300,0,"华盛顿",8);
t[3]=new Time(0,150,"洛杉矶",5);
t[4]=new Time(150,150,"伦敦",0);
t[5]=new Time(300,150,"芝加哥",7);
setBackground(Color.black);
}
public void paint(Graphics g){
super.paint(g);
for(int i=0;it.length;i++)
t[i].draw(g);
}
public void run() {
while(true){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
this.repaint();
}
}
}
/*上面就不注释了,下面的是Time类*/
class Time{
private int x,y;/*每个钟表的坐标*/
private String place;/*每个钟表的名字*/
private int timezone;/*每个钟表的时区,东x区为+x,西x区为-x*/
private Date d;
private long time;
private double hour,minite,second;
Time(int x,int y,String place,int timezone){
this.x=x;
this.y=y;
this.place=place;
this.timezone=timezone;
}
public void draw(Graphics g){
g.setColor(Color.green);
d=new Date();
time=d.getTime();/*获得0时区1970年1月1日0点到现在的毫秒数*/
hour=(((time/1000)+3600*timezone)%43200)*2*Math.PI/3600/12;/*计算时针弧度*/
minite=(time/1000)%3600*2*Math.PI/3600;/*计算分针弧度*/
second=(time/1000)%60*2*Math.PI/60;/*计算秒针弧度*/
/*画出钟表轮廓和时针*/
((Graphics2D)g).setStroke(new BasicStroke(3.0f));
((Graphics2D)g).drawOval(x, y, 100, 100);
((Graphics2D)g).drawLine(x+50, y, x+50, y+5);
((Graphics2D)g).drawLine(x+50, y+100, x+50, y+95);
((Graphics2D)g).drawLine(x, y+50, x+5, y+50);
((Graphics2D)g).drawLine(x+100,y+50, x+95, y+50);
((Graphics2D)g).drawLine(x+50,y+50,(int)(x+50+25*Math.sin(hour)),(int)(y+50-25*Math.cos(hour)));
/*画出分针*/
((Graphics2D)g).setStroke(new BasicStroke(2.0f));
((Graphics2D)g).drawLine(x+50,y+50,(int)(x+50+35*Math.sin(minite)),(int)(y+50-35*Math.cos(minite)));
/*画出秒针*/
((Graphics2D)g).setStroke(new BasicStroke(1.0f));
((Graphics2D)g).drawLine(x+50,y+50,(int)(x+50+45*Math.sin(second)),(int)(y+50-45*Math.cos(second)));
/*画出钟表名字*/
g.setColor(Color.red);
g.drawString(place, x+35, y+120);
}
}
写了好久,把分给我吧~~
本文标题：世界时钟java代码 java电子时钟
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