(Original by Xu jiansheng) Java Swing uses simple multithreading to achieve dynamic clock, swing Multithreading

(Original by Xu jiansheng) Java Swing uses simple multithreading to achieve dynamic clock, swing Multithreading

Note: This article is only for learning and communication.

The above is, the code below

The first class is Circle.

package org.xt.util;import java.awt.Point;public class Circle {    private Point centre;    private int radius;    public Circle(Point centre, int radius) {        this.centre = centre;        this.radius = radius;    }    public Point getCentre() {        return centre;    }    public void setCentre(Point centre) {        this.centre = centre;    }    public int getRadius() {        return this.radius;    }    public void setRadius(int radius) {        this.radius = radius;    }}

 

The second class is Clock.

Package org. xt. clock; import java. awt. basicStroke; import java. awt. borderLayout; import java. awt. color; import java. awt. graphics; import java. awt. graphics2D; import java. awt. renderingHints; import java. util. calendar; import javax. swing. JComponent; import javax. swing. JFrame; import javax. swing. JPanel; @ SuppressWarnings ("serial") public class Clock extends JComponent implements Runnable {private int radius; pub Lic Clock (int radius) {this. radius = radius;} public void paint (Graphics g) {Graphics2D g2d = (Graphics2D) g; // these two statements are the key to removing line aliasing, as for the principle, I am not clear about it. These two sentences are obtained by the author from the Internet (these two sentences are not self-written, haha) g2d. setStroke (new BasicStroke (1.0f, BasicStroke. CAP_BUTT, BasicStroke. JOIN_BEVEL); g2d. setRenderingHint (RenderingHints. KEY_ANTIALIASING, RenderingHints. VALUE_ANTIALIAS_ON); // The coordinate int clockPlateX = 0 in the upper left corner of the rectangle where the clock disk is located; int clockPlateY = 0; g2d. setColor (Color. GRAY); // draw two concentric discs as the frame g2d of the clock. drawOval (clockPlateX, clockPlateY, this. radius * 2, this. radius * 2); g2d. drawOval (clockPlateX + 5, clockPlateY + 5, this. radius * 2-10, this. radius * 2-10); // The Center Coordinate int centreX = this. radius; int centreY = centreX; g2d. setStroke (new BasicStroke (0.8f, BasicStroke. CAP_BUTT, BasicStroke. JOIN_BEVEL); // This is the g2d point in the center of the clock disk. fillOval (centreX-3, centreY -3, 6, 6); g2d. setStroke (new BasicStroke (2.0f, BasicStroke. CAP_BUTT, BasicStroke. JOIN_BEVEL); // start to draw a large scale. There are 12 in total, indicating 12 hours. The benchmark is the scale of 9, double degree = 0; double radian = Math. toRadians (degree); for (int I = 0; I <12; ++ I) {// calculate the point on the left of the curve, int leftX = (int) (double) centreX-(this. radius-15) * Math. cos (radian); int leftY = (int) (double) centreY-(this. radius-15) * Math. sin (radian ));// Calculate the right vertex of the dial line, int rightX = (int) (double) centreX-(this. radius-25) * Math. cos (radian); int rightY = (int) (double) centreY-(this. radius-25) * Math. sin (radian); g2d. drawLine (leftX, leftY, rightX, rightY); degree + = 30; // converts the angle to radian = Math. toRadians (degree);} g2d. setStroke (new BasicStroke (1.5f, BasicStroke. CAP_BUTT, BasicStroke. JOIN_BEVEL); // draw a small scale starting from the following, with a total of 60-12 = 48. The scale indicated by the benchmark is degr. Ee = 0; radian = Math. toRadians (degree); for (int I = 0; I <60; ++ I) {// This condition is to avoid duplicate if (I! = 0 & degree % 30! = 0) {int leftX = (int) (double) centreX-(this. radius-15) * Math. cos (radian); int leftY = (int) (double) centreY-(this. radius-15) * Math. sin (radian); int rightX = (int) (double) centreX-(this. radius-17) * Math. cos (radian); int rightY = (int) (double) centreY-(this. radius-17) * Math. sin (radian); g2d. drawLine (leftX, leftY, rightX, rightY);} // increase the degree of degree + = 360/60 each time; // convert the angle to radian = Math. toRadians (degree);} // obtain the current time, minute, second (Date class has been eliminated, use Calendar ar here) Calendar cal = Calendar. getInstance (); int second = cal. get (Calendar. SECOND); int minute = cal. get (Calendar. MINUTE); int hour = cal. get (Calendar. HOUR_OF_DAY); if (hour> 12) {hour = hour % 12;} // calculates the radian from the start position of the second needle, the remaining two sentences are the split needle and the double secondProp = Math. toRadians (second * (360/60); double minuteProp = Math. toRadians (minute * (360/60); double hourProp = Math. toRadians (hour + minuteProp/(2 * Math. PI) * (360/12); int leftX = (int) (centreX + (this. radius-25) * Math. sin (secondProp); int leftY = (int) (centreY-(this. radius-25) * Math. cos (secondProp); g2d. setStroke (new BasicStroke (1.0f, BasicStroke. CAP_BUTT, BasicStroke. JOIN_BEVEL); g. drawLine (leftX, leftY, centreX, centreY); leftX = (int) (centreX + (this. radius-45) * Math. sin (minuteProp); leftY = (int) (centreY-(this. radius-45) * Math. cos (minuteProp); g2d. setStroke (new BasicStroke (1.5f, BasicStroke. CAP_BUTT, BasicStroke. JOIN_BEVEL); g. drawLine (leftX, leftY, centreX, centreY); leftX = (int) (centreX + (this. radius-70) * Math. sin (hourProp); leftY = (int) (centreY-(this. radius-70) * Math. cos (hourProp); g2d. setStroke (new BasicStroke (2.5f, BasicStroke. CAP_BUTT, BasicStroke. JOIN_BEVEL); g. drawLine (leftX, leftY, centreX, centreY);} public void run () {while (true) {try {Thread. sleep (1000);} catch (InterruptedException e) {e. printStackTrace ();} this. repaint () ;}} public static void main (String [] args) {JFrame frame = new JFrame (); JPanel = new JPanel (new BorderLayout (); frame. setContentPane (panel); Clock clock = new Clock (150); new Thread (clock ). start (); panel. add (clock, BorderLayout. CENTER); frame. setdefaclocloseoperation (JFrame. EXIT_ON_CLOSE); frame. setSize (600,400); frame. setVisible (true );}}

 

Haha, the level is limited, and the code writing is messy

 

-- Written on 20:30:00