clock.java

用java做的时钟,适合初学者学习使用,交流

package Demo;
import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.awt.event.*;
import java.text.*;
public class Clock extends JPanel implements Runnable{
	private JTextField jt;
	private JPanel jp;
	public Clock(){
		Thread c=new Thread(this);
		c.start();
		jp=new JPanel();
		jt=new JTextField();
		jt.setEditable(false);
		jt.setHorizontalAlignment(jt.CENTER);
		this.setLayout(new BorderLayout());
		add(jt,BorderLayout.SOUTH);
	  add(jp,BorderLayout.CENTER);
	
	}
	public void run(){
		while(true){
			this.repaint();
			try{
					Thread.sleep(1000);
			}
			catch(Exception e){
				e.printStackTrace();
			}
	
		}
		
	}
	public void paint(Graphics g){
		super.paint(g);
	Calendar cal=Calendar.getInstance();
	DateFormat format=DateFormat.getDateTimeInstance(DateFormat.LONG,
	DateFormat.LONG,this.getLocale());
	jt.setText(format.format(cal.getTime()));
	int min=Math.min(this.getSize().width,this.getSize().height);
	int radix=(int)(min*0.8);
	int kedu=(int)(radix*0.48);
	int sl=(int)(radix*0.4);
	int ml=(int)(sl*0.8);
	int hl=(int)(ml*0.8);
	int xo=this.getSize().width/2;
	int yo=this.getSize().height/2;
	for(int i=0;i<60;i++){
		if(i%5==0){
				g.drawLine((int)(kedu*0.92*(Math.sin(i*Math.PI/30))+xo),
		(int)(yo-(kedu*0.92*(Math.cos(i*Math.PI/30)))),
		(int)(xo+(radix/2)*(Math.sin(i*Math.PI/30))),
		(int)(yo-(radix/2*(Math.cos(i*Math.PI/30)))));
		if(i==0)
		g.drawString(""+12,(int)(kedu*0.92*(Math.sin(i*Math.PI/30))+xo),
		(int)(yo-(kedu*0.92*(Math.cos(i*Math.PI/30)))));
		else
			g.drawString(""+i/5,(int)(kedu*0.92*(Math.sin(i*Math.PI/30))+xo),
		(int)(yo-(kedu*0.92*(Math.cos(i*Math.PI/30)))));
		}
		g.drawLine((int)(kedu*(Math.sin(i*Math.PI/30))+xo),
		(int)(yo-(kedu*(Math.cos(i*Math.PI/30)))),
		(int)(xo+(radix/2)*(Math.sin(i*Math.PI/30))),
		(int)(yo-(radix/2*(Math.cos(i*Math.PI/30)))));
		}
	g.drawOval((this.getSize().width-radix)/2,(this.getSize().height-radix)/2,radix,radix);
	Graphics2D gg=(Graphics2D)g;
	gg.setColor(Color.MAGENTA);
	gg.setStroke(new BasicStroke(4.5f));
	gg.drawLine(xo,yo,xo+(int)(hl*Math.sin((cal.get(Calendar.MINUTE)/60.0+cal.get(Calendar.HOUR))*
	Math.PI/6)),yo-(int)((hl*Math.cos((cal.get(Calendar.MINUTE)/60.0+cal.get(Calendar.HOUR))*
	Math.PI/6))));
	gg.setColor(Color.BLUE);
	gg.setStroke(new BasicStroke(2.7f));
	gg.drawLine(xo,yo,xo+(int)(ml*Math.sin(cal.get(Calendar.MINUTE)*Math.PI/30)),
	yo-(int)(ml*Math.cos(cal.get(Calendar.MINUTE)*Math.PI/30)));
	gg.setStroke(new BasicStroke(1.0f));
	gg.setColor(Color.RED);
	gg.drawLine(xo,yo,xo+(int)(sl*Math.sin(cal.get(Calendar.SECOND)*Math.PI/30)),
	yo-(int)(sl*Math.cos(cal.get(Calendar.SECOND)*Math.PI/30)));
	
}


public static void main(String args[]){
	Clock cd=new Clock();
	JFrame j=new JFrame("clock");
	j.getContentPane().add(cd);
	j.setBounds(200,200,400,400);
	j.setVisible(true);
	j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
//<applet code=Clock.class width=300 height=300></applet>