Java Swing与线程的结合应用（三）

package com.han;import java.awt.BasicStroke;import java.awt.Color;import java.awt.Container;import java.awt.Graphics2D;import java.util.Random;import javax.swing.JFrame;/** * 利用线程在Swing窗口(顶级Container， 与JFrame有区别在于多了标题栏的空间)中画动态线条 *  * @author HAN *  */public class ThreadAndSwing_3 extends JFrame {/** *  */private static final long serialVersionUID = -913556444768132509L;static Thread thread;Container container;enum Colors {BLACK(Color.BLACK),BLUE(Color.BLUE),CYAN(Color.CYAN),GREEN(Color.GREEN), ORANGE(Color.ORANGE),YELLOW(Color.YELLOW), RED(Color.RED), PINK(Color.PINK), LIGHT_GRAY(Color.LIGHT_GRAY);private Color c;private Colors(Color c) {this.c = c;}public Color getColor() {return this.c;}}public ThreadAndSwing_3() {// TODO Auto-generated constructor stubcontainer = getContentPane();container.setLayout(null);}void paintJFrame() {thread = new Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stub/* * Creates a graphics context for Container (you can also try it * for JFrame) */Graphics2D g = (Graphics2D) container.getGraphics();Colors[] colors = Colors.values();Random random = new Random();int y2 = 30;float width = 0;while (true) {try {Thread.sleep(500);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}/* * Returns a pseudorandom, uniformly distributed int value * between 0 (inclusive) and the specified value (exclusive) */Color c = colors[random.nextInt(colors.length)].getColor();// System.out.println(c);g.setColor(c);g.setStroke(new BasicStroke(width++));/* * Draws a line, using the current color, between the points * (x1, y1) and (x2, y2) in this graphics context's * coordinate system. */g.drawLine(30, y2, 100, y2++);if (y2 > 70) {width = 0;y2 = 30;}}}});thread.start();}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubThreadAndSwing_3 frame = new ThreadAndSwing_3();frame.setTitle("利用线程在Swing窗口中画动态线条");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setBounds(100, 100, 300, 200);frame.setVisible(true); // display the frame/* * because g will be null if Graphics g = container.getGraphics(); * before the display of the related component */frame.paintJFrame();}}