我要评论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
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。
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