java查看时区

java 如何获取当前系统的时区，不是时间

Calendar cal = Calendar.getInstance();

TimeZone timeZone = cal.getTimeZone();

System.out.println(timeZone.getID());

System.out.println(timeZone.getDisplayName());

你试试这个行不行

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。\x0d\x0aimport java.awt.*;\x0d\x0aimport java.awt.event.*;\x0d\x0aimport java.util.*;\x0d\x0a\x0d\x0a//世界时钟\x0d\x0apublic class TimerTest {\x0d\x0apublic static void main(String[] args) {\x0d\x0anew TimerTestFrame(“世界时钟”);\x0d\x0a}\x0d\x0a}\x0d\x0a\x0d\x0aclass TimerTestFrame extends Frame {\x0d\x0a/**\x0d\x0a* \x0d\x0a*/\x0d\x0aprivate static final long serialVersionUID = 1L;\x0d\x0a\x0d\x0apublic TimerTestFrame(String s) {\x0d\x0asuper(s);\x0d\x0aaddWindowListener(new WindowAdapter() {\x0d\x0apublic void windowClosing(WindowEvent e) {\x0d\x0adispose();\x0d\x0aSystem.exit(0);\x0d\x0a}\x0d\x0a});\x0d\x0asetLayout(new GridLayout(2, 6));\x0d\x0a\x0d\x0aClockCanvas clk1 = new ClockCanvas(“北京”, “GMT+8”); // 创建时钟\x0d\x0aClockCanvas clk2 = new ClockCanvas(“巴黎”, “GMT+2”);\x0d\x0aClockCanvas clk3 = new ClockCanvas(“华盛顿”, “GMT-4”);\x0d\x0aClockCanvas clk4 = new ClockCanvas(“洛衫矶”, “GMT-7”);\x0d\x0aClockCanvas clk5 = new ClockCanvas(“伦敦”, “GMT+1”);\x0d\x0aClockCanvas clk6 = new ClockCanvas(“芝加哥”, “GMT-5”);\x0d\x0aadd(clk1);\x0d\x0aadd(clk2);\x0d\x0aadd(clk3);\x0d\x0aadd(clk4);\x0d\x0aadd(clk5);\x0d\x0aadd(clk6);\x0d\x0asetSize(500, 350); // 设置框架宽高\x0d\x0asetVisible(true);\x0d\x0a}\x0d\x0a}\x0d\x0a\x0d\x0aclass ClockCanvas extends Canvas implements Runnable {\x0d\x0a/**\x0d\x0a* \x0d\x0a*/\x0d\x0aprivate static final long serialVersionUID = 1L;\x0d\x0a\x0d\x0aprivate int seconds = 0;\x0d\x0a\x0d\x0aprivate String city;\x0d\x0a\x0d\x0aprivate GregorianCalendar calendar;\x0d\x0a\x0d\x0aThread t;\x0d\x0a\x0d\x0apublic ClockCanvas(String c, String tz) {\x0d\x0acity = c;\x0d\x0a//也可以通过TimeZone.setTimeZone(String n)函数改变时区，n为时区参数名。\x0d\x0acalendar = new GregorianCalendar(TimeZone.getTimeZone(tz));\x0d\x0at = new Thread(this);\x0d\x0at.start();\x0d\x0asetSize(125, 125); // 设置画布大小\x0d\x0asetBackground(Color.black);\x0d\x0a}\x0d\x0a\x0d\x0a// 重写父类的方法绘制时钟图形\x0d\x0apublic void paint(Graphics g) {\x0d\x0aGraphics2Dg2d = (Graphics2D) g;\x0d\x0aBasicStroke bstroke = new BasicStroke(2.0f);\x0d\x0ag2d.setStroke(bstroke);\x0d\x0ag2d.setColor(Color.green);\x0d\x0ag2d.drawOval(0, 0, 100, 100);\x0d\x0abstroke = new BasicStroke(5.0f);\x0d\x0ag2d.setStroke(bstroke);\x0d\x0ag2d.drawLine(50, 0, 50, 5);\x0d\x0ag2d.drawLine(0, 50, 5, 50);\x0d\x0ag2d.drawLine(50, 95, 50, 98);\x0d\x0ag2d.drawLine(95, 50, 98, 50);\x0d\x0adouble hourAngle = 2 * Math.PI * (seconds – 3 * 60 * 60)\x0d\x0a/ (12 * 60 * 60);\x0d\x0adouble minuteAngle = 2 * Math.PI * (seconds – 15 * 60) / (60 * 60);\x0d\x0adouble secondAngle = 2 * Math.PI * (seconds – 15) / (60);\x0d\x0abstroke = new BasicStroke(5.0f);\x0d\x0ag2d.setStroke(bstroke);\x0d\x0ag2d.drawLine(50, 50, 50 + (int) (30 * Math.cos(hourAngle)),\x0d\x0a50 + (int) (30 * Math.sin(hourAngle)));\x0d\x0abstroke = new BasicStroke(3.0f);\x0d\x0ag2d.setStroke(bstroke);\x0d\x0ag2d.drawLine(50, 50, 50 + (int) (40 * Math.cos(minuteAngle)),\x0d\x0a50 + (int) (40 * Math.sin(minuteAngle)));\x0d\x0abstroke = new BasicStroke(1.0f);\x0d\x0ag2d.setStroke(bstroke);\x0d\x0ag2d.drawLine(50, 50, 50 + (int) (45 * Math.cos(secondAngle)),\x0d\x0a50 + (int) (45 * Math.sin(secondAngle)));\x0d\x0ag2d.setColor(Color.red);\x0d\x0ag2d.drawString(city, 35, 115);\x0d\x0a}\x0d\x0a\x0d\x0apublic void timeElapsed() {\x0d\x0a//new Date()()获得当前时间\x0d\x0aSystem.out.println(new Date()());\x0d\x0acalendar.setTime(new Date()());\x0d\x0aseconds = calendar.get(Calendar.HOUR) * 60 * 60\x0d\x0a+ calendar.get(Calendar.MINUTE) * 60\x0d\x0a+ calendar.get(Calendar.SECOND);\x0d\x0a}\x0d\x0a\x0d\x0apublic void run() {\x0d\x0atry {\x0d\x0awhile (true) {\x0d\x0aThread.sleep(300);\x0d\x0atimeElapsed();\x0d\x0arepaint();\x0d\x0a}\x0d\x0a} catch (InterruptedException e) {\x0d\x0a}\x0d\x0a}\x0d\x0a}

java中我如何获取时区？

//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。

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) {

}

}

}