import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.*;
import java.util.Calendar;
import java.util.GregorianCalendar;
class Clock extends JFrame implements ActionListener{
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 Clock(){
super("Clock by kikiwawa");
setDefaultCloseOperation(3);
setSize(200,200);
setBackground(Color.BLACK);
setLocation(300,150);
setResizable(false);
setVisible(true);
int delay = 1000;
ActionListener drawClock = new ActionListener(){
public void actionPerformed(ActionEvent evt){
repaint();
}
};
new Timer(delay,drawClock).start();
}
public void actionPerformed(ActionEvent e){
}
public void paint(Graphics g){
Graphics2D g2D = (Graphics2D)g;
Insets insets = getInsets();
int L = insets.left/2,T = insets.top/2;
h = getSize().height;
g.setColor(Color.white);
g2D.setStroke(new BasicStroke(4.0f));
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;
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.drawString(""+i,x,h-y);
ang-=30;
}
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;
if(nowh<10) st="0"+nowh;else st=""+nowh;
if(nowm<10) st+=":0"+nowm;else st+=":"+nowm;
if(nows<10) st+=":0"+nows;else st+=":"+nows;
g.setColor(Color.pink);
g.fillRect(L,T,50,28);
g.setColor(Color.blue);
g.drawString(st,L+2,T+26);
ss=90-nows*6;
mm=90-nowm*6;
hh=90-nowh*30-nowm/2;
x0=r+40+L;
y0=r+40+T;
if(olds_x>0){
g.setColor(getBackground());
g.drawLine(x0,y0,olds_x,h-olds_y);
}
else{
old_m = mm;
old_h = hh;
}
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));
if(old_m!=mm){
g.setColor(getBackground());
g.drawLine(x0,y0,oldm_x,h-oldm_y);
}
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(3.4f));
if(old_h!=hh){
g.setColor(getBackground());
g.drawLine(x0,y0,oldh_x,h-oldh_y);
}
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){
Clock c = new Clock();
} }
4
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JFrame;
import javax.swing.Timer;
public class test1 extends JFrame{
public test1(){
super();
setSize(300,100);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
Timer timer = new Timer(1000, new ActionListener(){
public void actionPerformed(ActionEvent evt) {
setTitle( new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
}
}
);
timer.start();
}
public static void main( String... args ){
new test1();
}
}
//新鲜出炉的，你不追加分就是对不起我。
每一秒就用 new Date()获得当前时间 并且按照你的个人想法设置相应的 SimpleDateFormat对其进行format
如果需要封装成可视化的就把这个new Date()放进一个Frame里面
System.out.println(sdf.format(new Date()));
