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 stub
container = getContentPane();
container.setLayout(null);
}

void paintJFrame() {
thread = new Thread(new Runnable() {

@Override
public 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 block
e.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 stub
ThreadAndSwing_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();
}

}