典型多线程小实例：球的运动

*一个典型的多线程小实例球的运动

*几乎每一处都有注释只要一点时间就能看懂

*适合初学者学习交流

*/

import javaawt*;

import javaawtevent*;

import javaxswing*;

import javaxswingevent*;

public class ball

{

public static void main(String args[])

{

new frame();

}

}

class frame extends JFrame implements ActionListenerChangeListener

{

JPanel jp_HuaBan;

JPanel jp_YuLan;

JSlider js_red;

JSlider js_green;

JSlider js_blue;

JSlider js_size;

int x=y=;

int ball_size=;

public frame()

{

super(ball);

//创建画板

jp_HuaBan=new JPanel();

jp_HuaBansetBounds();

jp_HuaBansetBackground(Colorwhite);

//创建球的予览框

jp_YuLan=new JPanel();

jp_YuLansetBounds();

jp_YuLansetBackground(Colorwhite);

//创建一个文本框作为状态栏

JTextField jt_status=new JTextField(请选择球的颜色大小然后点击按钮);

jt_statussetBounds();

jt_statussetEditable(false);

//创建红绿蓝三个标签

JLabel jl_red=new JLabel(红);

jl_redsetBounds();

JLabel jl_green=new JLabel(绿);

jl_greensetBounds();

JLabel jl_blue=new JLabel(蓝);

jl_bluesetBounds();

JLabel jl_size=new JLabel(大小);

jl_sizesetBounds();

//创建红绿蓝三个滑块

js_red=new JSlider(SwingConstantsHORIZONTAL);

js_redsetBounds();

//填充滑块

js_redputClientProperty(JSliderisFilledBooleanTRUE);

//绘制勾号标记

js_redsetPaintTicks(true);

//主要的勾号标记大小

js_redsetMajorTickSpacing();

//次要的勾号标记大小

js_redsetMinorTickSpacing();

//显示主要刻度的数字标记

js_redsetPaintLabels(true);

//添加监听者

js_redaddChangeListener(this);

js_green=new JSlider(SwingConstantsHORIZONTAL);

js_greensetBounds();

js_greenputClientProperty(JSliderisFilledBooleanTRUE);

js_greensetPaintTicks(true);

js_greensetMajorTickSpacing();

js_greensetMinorTickSpacing();

js_greensetPaintLabels(true);

js_greenaddChangeListener(this);

js_blue=new JSlider(SwingConstantsHORIZONTAL);

js_bluesetBounds();

js_blueputClientProperty(JSliderisFilledBooleanTRUE);

js_bluesetPaintTicks(true);

js_bluesetMajorTickSpacing();

js_bluesetMinorTickSpacing();

js_bluesetPaintLabels(true);

js_blueaddChangeListener(this);

//创建球的大小的滑块

js_size=new JSlider(SwingConstantsHORIZONTAL);

js_sizesetBounds();

js_sizeputClientProperty(JSliderisFilledBooleanTRUE);

js_sizesetPaintTicks(true);

js_sizesetMajorTickSpacing();

js_sizesetMinorTickSpacing();

js_sizesetPaintLabels(true);

js_sizeaddChangeListener(this);

//创建按钮

JButton jb=new JButton(ball);

jbsetBounds();

jbaddActionListener(this);

//将所有对象添加到窗体

Container c=thisgetContentPane();

csetLayout(null);

cadd(jp_HuaBan);

cadd(jp_YuLan);

cadd(jl_red);

cadd(jl_green);

cadd(jl_blue);

cadd(jl_size);

cadd(js_red);

cadd(js_green);

cadd(js_blue);

cadd(js_size);

cadd(jb);

cadd(jt_status);

//设置窗体的位置和大小

thissetBounds();

thissetResizable(false);

thissetVisible(true);

thisaddWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

Systemexit();

}

});

}

public void actionPerformed(ActionEvent e)

{

Color ball_color=new Color(js_redgetValue()

js_greengetValue()js_bluegetValue());

rball r=new rball(jp_HuaBanjs_sizegetValue()ball_color);

rstart();

lball l=new lball(jp_HuaBanjs_sizegetValue()ball_color);

lstart();

}

public void stateChanged(ChangeEvent e)

{

//获得jp_YuLan的画笔并在jp_YuLan的中心画个圆

Graphics g=jp_YuLangetGraphics();

gsetColor(Colorwhite);

gfillOval(xyball_sizeball_size);

x=js_sizegetValue()/;

y=js_sizegetValue()/;

ball_size=js_sizegetValue();

gsetColor(new Color(js_redgetValue()

js_greengetValue()js_bluegetValue()));

gfillOval(xyball_sizeball_size);

gdispose();

}

}

class lball extends Thread

{

//从窗口左面出现的球

JPanel jp_HuaBan;

int ball_size;

Color ball_color;

public lball(JPanel jint iColor c)

{

//获得画板的句柄

jp_HuaBan=j;

//获得球的大小

ball_size=i;

//获得球的颜色

ball_color=c;

}

public void run()

{

Graphics g=jp_HuaBangetGraphics();

int x=y=;

//计算画球时X轴Y轴的最大坐标

int HuaBan_x=ball_size;

int HuaBan_y=ball_size;

//球移动的增量

int x_increase=y_increase=;

while(true)

{

//将上一次画的球擦掉

gsetColor(Colorwhite);

gfillOval(xyball_sizeball_size);

//画球

gsetColor(ball_color);

x=x+x_increase;

y=y+y_increase;

gfillOval(xyball_sizeball_size);

//判断球是否到达了边界若到达了则转向

if(x<= || x>=HuaBan_x) x_increase=x_increase;

if(y<= || y>=HuaBan_y) y_increase=y_increase;

try

{

//休眠一段时间

Threadsleep();

}

catch(Exception e){}

}

}

}

class rball extends Thread

{

//从窗口左面出现的球

JPanel jp_HuaBan;

int ball_size;

Color ball_color;

public rball(JPanel jint iColor c)

{

jp_HuaBan=j;

ball_size=i;

ball_color=c;

}

public void run()

{

Graphics g=jp_HuaBangetGraphics();

int x=ball_sizey=;

int HuaBan_x=x;

int HuaBan_y=ball_size;

int x_increase=y_increase=;

while(true)

{

gsetColor(Colorwhite);

gfillOval(xyball_sizeball_size);

gsetColor(ball_color);

x=x+x_increase;

y=y+y_increase;

gfillOval(xyball_sizeball_size);

if(x<= || x>=HuaBan_x) x_increase=x_increase;

if(y<= || y>=HuaBan_y) y_increase=y_increase;

try

{

Threadsleep();

}

catch(Exception e){}

}

}

}

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