这篇文章介绍了使用JFrame完成动态模拟时钟,在面板中绘制时钟并提取系统当前时刻,主方法中暂停线程1秒,刷新面板。
实现代码如下
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import javax.swing.*; import java.awt.*; import java.util.*; import java.lang.Thread; import java.text.DecimalFormat; public class StillClock extends JPanel { /** * @param args */ private int hour; private int minute; private int second; //构造函数 public StillClock() { setCurrentTime(); } //返回小时 public int getHour() { return hour; } public int getMinute() { return minute; } public int getSecond() { return second; } //绘制时钟 protected void paintComponent(Graphics g) { super .paintComponent(g); //初始化 int clockRadius = ( int )(Math.min(getWidth(), getHeight()) * 0.8 * 0.5 ); int xCenter = getWidth() / 2 ; int yCenter = getHeight() / 2 ; //画圆 g.setColor(Color.black); g.drawOval(xCenter - clockRadius, yCenter - clockRadius, 2 * clockRadius, 2 * clockRadius); g.drawString( "12" , xCenter - 5 , yCenter - clockRadius + 15 ); g.drawString( "9" , xCenter - clockRadius + 3 , yCenter + 5 ); g.drawString( "3" , xCenter + clockRadius - 10 , yCenter + 3 ); g.drawString( "6" , xCenter - 3 , yCenter + clockRadius - 3 ); //画秒针 int sLength = ( int )(clockRadius * 0.8 ); int xSecond = ( int )(xCenter + sLength * Math.sin(second * ( 2 * Math.PI / 60 ))); int ySecond = ( int )(yCenter - sLength * Math.cos(second * ( 2 * Math.PI / 60 ))); g.setColor(Color.red); g.drawLine(xCenter, yCenter, xSecond, ySecond); //画分针 int mLenth = ( int )(clockRadius * 0.65 ); int xMinute = ( int )(xCenter + mLenth * Math.sin(minute * ( 2 * Math.PI / 60 ))); int yMinute = ( int )(xCenter - mLenth * Math.cos(minute * ( 2 * Math.PI / 60 ))); g.setColor(Color.blue); g.drawLine(xCenter, yCenter, xMinute, yMinute); //画时针 int hLength = ( int )(clockRadius * 0.5 ); int xHour = ( int )(xCenter + hLength * Math.sin((hour % 12 + minute / 60.0 ) * ( 2 * Math.PI / 12 ))); int yHour = ( int )(yCenter - hLength * Math.cos((hour % 12 + minute / 60.0 ) * ( 2 * Math.PI / 12 ))); g.setColor(Color.green); g.drawLine(xCenter, yCenter, xHour, yHour); //画数字时钟 g.setColor(Color.black); DecimalFormat s= new DecimalFormat( "00" ); g.drawString(s.format(getHour()) + ":" + s.format(getMinute()) + ":" + s.format(getSecond()), xCenter - 22 , yCenter - clockRadius - 15 ); } public void setCurrentTime() { Calendar calendar = new GregorianCalendar(); this .hour = calendar.get(Calendar.HOUR_OF_DAY); this .minute = calendar.get(Calendar.MINUTE); this .second = calendar.get(Calendar.SECOND); } public static void main(String[] args) { // TODO Auto-generated method stub JFrame frame = new JFrame( "DiaplayClock" ); frame.setResizable( false ); frame.setTitle( "DiaplayClock" ); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize( 300 , 350 ); frame.setVisible( true ); while ( true ) { StillClock clock = new StillClock(); frame.getContentPane().add(clock); clock.setVisible( true ); frame.validate(); try { Thread.sleep( 1000 ); } catch (InterruptedException e) { e.printStackTrace(); } clock.setVisible( false ); frame.remove(clock); clock = null ; frame.validate(); } } } |
效果图:
以上就是本文的全部内容,希望大家可以喜欢。