paintclock.java

用Java实现时钟

/*
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 * and open the template in the editor.
 */

package clock;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 *
 * @author Administrator
 */
public class PaintClock extends Canvas {
    double 时x = 100.0;
    double 时y = 100.0;
    double 分x = 100.0;
    double 分y = 100.0;
    double 秒x = 100.0;
    double 秒y = 100.0;
    final double PI = 3.1415926;
    PaintClock() {
        new Thread(new Runnable() {
            public void run() {
                while (true) {
                    try {
                        nowtime();
                        repaint();
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        System.out.println("线程错误");
                    }
                }
            }
        }).start();
    }
    public void nowtime() {
        Date time = new Date();
        SimpleDateFormat h = new SimpleDateFormat("hh");
        int 时 = Integer.parseInt(h.format(time));
        SimpleDateFormat m = new SimpleDateFormat("mm");
        int 分 = Integer.parseInt(m.format(time));
        SimpleDateFormat s = new SimpleDateFormat("ss");
        int 秒 = Integer.parseInt(s.format(time));
        this.秒x = Math.cos(秒 * PI / 30 - PI / 2) * 50 + 100; //三角函数计算坐标
        this.秒y = Math.sin(秒 * PI / 30 - PI / 2) * 50 + 100; //一秒一动
        this.分x = Math.cos(分 * PI / 30 - PI / 2) * 45 + 100;
        this.分y = Math.sin(分 * PI / 30 - PI / 2) * 45 + 100; //一分一动
        this.时x = Math.cos((时 * 60 + 分) * PI / 360 - PI / 2) * 40 + 100; //一分一动
        this.时y = Math.sin((时 * 60 + 分) * PI / 360 - PI / 2) * 40 + 100;
    }
    @Override
    public void paint(Graphics g) {
        //线
        g.drawLine(100, 100, (int) 时x, (int) 时y);
        g.setColor(Color.GREEN);
        g.drawLine(100, 100, (int) 分x, (int) 分y);
        g.setColor(Color.RED);
        g.drawLine(100, 100, (int) 秒x, (int) 秒y);
        //圆
        g.setColor(Color.RED);
        g.drawOval(50, 50, 100, 100);
        g.setColor(Color.blue);
        g.drawOval(60, 60, 80, 80);
        //字
        g.setColor(Color.black);
        g.drawString("12", 94, 60);
        //g.drawString("2", 135, 85);
        g.drawString("3", 142, 104);
        g.drawString("6", 94, 150);
        g.drawString("9", 52, 104);
       // validate();
    }
}