Question

编写一个java程序，读取系统时间，然后将时间用中文输出

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.Calendar;
import javax.swing.*;

public class Clock extends JPanel implements ActionListener
{
//创建时钟的外形
protected static Ellipse2D face = new Ellipse2D.Float( 3, 3, 94, 94 );

//创建时钟的标记
protected static GeneralPath tick = new GeneralPath();

static
{
tick.moveTo( 100, 100 );
tick.moveTo( 49, 0 );
tick.lineTo( 51, 0 );
tick.lineTo( 49, 6 );
tick.lineTo( 49, 0 );
}

//创建时针
protected static GeneralPath hourHand = new GeneralPath();
static
{
hourHand.moveTo( 50, 15 );
hourHand.lineTo( 53, 50 );
hourHand.lineTo( 50, 53 );
hourHand.lineTo( 47, 50 );
hourHand.lineTo( 50, 15 );
}

//创建分针
protected static GeneralPath minuteHand = new GeneralPath();
static
{
minuteHand.moveTo( 50, 2 );
minuteHand.lineTo( 53, 50 );
minuteHand.lineTo( 50, 58 );
minuteHand.lineTo( 47, 50 );
minuteHand.lineTo( 50, 2 );
}

//创建秒针
protected static GeneralPath secondHand = new GeneralPath();
static
{
secondHand.moveTo( 49, 5 );
secondHand.lineTo( 51, 5 );
secondHand.lineTo( 51, 62 );
secondHand.lineTo( 49, 62 );
secondHand.lineTo( 49, 5 );
}

//设置时钟的颜色
protected static Color faceColor = new Color( 220, 220, 220 );
protected static Color hourColor = Color.red.darker();
protected static Color minuteColor = Color.blue.darker();
protected static Color secondColor = new Color( 180, 180, 0 );
protected static Color pinColor = Color.gray.brighter();

//设置时钟的枢纽
protected Ellipse2D pivot = new Ellipse2D.Float( 47, 47, 6, 6 );
protected Ellipse2D centerPin = new Ellipse2D.Float( 49, 49, 2, 2 );

//创建饶时钟枢纽转的变换
protected AffineTransform hourTransform =
AffineTransform.getRotateInstance( 0, 50, 50 );
protected AffineTransform minuteTransform =
AffineTransform.getRotateInstance( 0, 50, 50 );
protected AffineTransform secondTransform =
AffineTransform.getRotateInstance( 0, 50, 50 );

//创建每秒触发一次的Timer
protected Timer timer = new Timer( 1000, this );
protected Calendar calendar = Calendar.getInstance();

public Clock()
{
setPreferredSize( new Dimension( 100, 100 ) );
}

public void addNotify()
{
super.addNotify();
timer.start();
}

public void removeNotify()
{
timer.stop();
super.removeNotify();
}

public void actionPerformed( ActionEvent event )
{
//更新calendar的时间
this.calendar.setTime( new java.util.Date() );
int hours = this.calendar.get( Calendar.HOUR );
int minutes = this.calendar.get( Calendar.MINUTE );
int seconds = this.calendar.get( Calendar.SECOND );

//设置变换， 使得时针、分针、秒针各自绕枢纽旋转一定的角度
hourTransform.setToRotation( ( ( double ) hours ) * ( Math.PI / 6.0 ), 50, 50 );
minuteTransform.setToRotation( ( ( double ) minutes ) * ( Math.PI / 30.0 ), 50, 50 );
secondTransform.setToRotation( ( ( double ) seconds ) * ( Math.PI / 30.0 ), 50, 50 );

repaint();
}

public void paint( Graphics g )
{
super.paint( g );

//得到图形上下文和抗锯齿处理
Graphics2D g2 = ( Graphics2D ) g;
g2.setRenderingHint( RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON );
g2.setPaint( faceColor );
g2.fill( face );
g2.setPaint( Color.black );
g2.draw( face );

//产生钟面上12个滴答位置
for( double p = 0.0; p < 12.0; p += 1.0 )
{
//利用变换画出同心的滴答的标线
g2.fill( tick.createTransformedShape(
AffineTransform.getRotateInstance( ( Math.PI / 6.0 ) * p, 50, 50 ) ) );
}

g2.setPaint( hourColor );
g2.fill( hourHand.createTransformedShape( hourTransform ) );
g2.setPaint( minuteColor );
g2.fill( minuteHand.createTransformedShape( minuteTransform ) );
g2.setPaint( secondColor );
g2.fill( secondHand.createTransformedShape( secondTransform ) );
g2.fill( pivot );
g2.setPaint( pinColor );
g2.fill( centerPin );
}

public static void main( String[] args )
{
JFrame frame = new JFrame();
frame.setLocation( 700, 400 );
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.getContentPane().add( new Clock() );
frame.pack();
frame.show();
}
}