一般来说是不应该像你这样写的，应该是把要画的步骤写在组件的被覆写的paintComponent函数里，然后在你响应事件的函数里直接掉用该组件的repaint()函数即可。repaint函数是会去掉该组件的paintComponent()函数的。至于你这么写为啥不行，这个我也不清楚，据我猜测，repaint函数要做的事情是刷新组件，并且重新去画一遍，不过这个步骤不一定是立即完成，可能有延迟。总之在你画那些棋子之后，它又干了一些事情，导致你画的棋子没了（但这不会影响到它自己想去画的东西，即paintComponent()函数里的东西），另外不要忘了，覆写paintComponent时，第一行要写，super.paintComponent(g)，这是去画它原来有的东西（比如加上去的按钮，文本框之类的东西）
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例如下面：
12345678910111213141516171819202122232425262728293031323334353637class PanelM extends JPanel{ ImageIcon icon = new ImageIcon("app.gif"); JLabel jl = new JLabel(icon, SwingConstants.CENTER); int x, y; private ListInteger listX = new ArrayListInteger(); private ListInteger listY = new ArrayListInteger(); public PanelM() { add(jl); addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent m) { x = m.getX(); y = m.getY(); listX.add(x); listY.add(y); repaint(); } }); } public void paintComponent(Graphics g) { super.paintComponent(g); for (int i = 0; i listX.size(); i++) { g.fillOval(listX.get(i), listY.get(i), 20, 20); } }}
保存成.java文件直接运行编译
这是我回答的别人问题的答案地址
import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;
class Gobang extends JFrame implements Runnable, ActionListener
{
final static int Player=1;
final static int AI =-1;
ClassLoader cl = this.getClass().getClassLoader();
Toolkit tk = Toolkit.getDefaultToolkit();
int length=14, game_state, winner, check, step;
int grid[][] = new int[length][length];
int locX, locY /* �囱�竚 */, count /* 硈囱计 */, x, y /* 既��竚 */, displace_x=0, displace_y=0 /* �簿秖 */, direction;
ArrayList steps = new ArrayList(); /* 疠魁囱˙ */
JPopupMenu control_menu = new JPopupMenu(); /* �龄匡虫�� */
JMenuItem[] command = new JMenuItem[4];
String[] command_str={"�囱", "�郎", "弄郎", "�秨"};
int[][] dir = { {-1, -1}, {-1, 0}, {-1, 1}, {0, -1}, {0, 1}, {1, -1}, {1, 0}, {1, 1} };
boolean[] dir2 = new boolean[8];
boolean turn;
String message;
final JDialog dialog = new JDialog(this, "叫匡�", true);
Font font=new Font("new_font", Font.BOLD, 20);
Grid grids[][] = new Grid[length][length];
Image white= tk.getImage(cl.getResource("res/white.png"));
Image black= tk.getImage(cl.getResource("res/black.png"));
Image title= tk.getImage(cl.getResource("res/title.png"));
Image temp;
JPanel boardPanel, bigpanel;
JRadioButton[] choice = new JRadioButton[2];
final static int Start =0;
final static int Select =1;
final static int Playing =2;
final static int End =3;
final static int nil=-1; /* 礚よ� */
final static int oblique_1 =0; /* ���オ� */
final static int oblique_2 =1; /* オ���� */
final static int horizontal =2; /* 绢� */
final static int vertical=3; /* �� */
Gobang()
{
super("き�囱");
boardPanel = new JPanel();
boardPanel.setLayout(new GridLayout(length, length, 0, 0));
boardPanel.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
for(int i=0; ilength; i++)
for(int j=0; jlength; j++)
{
grids[i][j] = new Grid(i, j);
boardPanel.add(grids[i][j]);
}
bigpanel = new JPanel();
bigpanel.add(boardPanel, BorderLayout.CENTER);
getContentPane().add(bigpanel, BorderLayout.SOUTH);
game_state=Start;
ThreadStart();
dialog.setSize(160, 100);
dialog.setResizable(false);
dialog.setLocationRelativeTo(null);
ButtonGroup choice_group = new ButtonGroup();
JPanel choice_menu = new JPanel();
choice[0] = new JRadioButton("堵�", new ImageIcon(black), true);
choice[1] = new JRadioButton("フ�", new ImageIcon(white));
for(int i=0; ichoice.length; i++)
{
choice_menu.add(choice[i]);
choice_group.add(choice[i]);
}
for(int i=0; icommand.length; i++)
{
command[i] =new JMenuItem(command_str[i]);
command[i].addActionListener(this);
control_menu.add(command[i]);
}
JButton select = new JButton("絋）");
JPanel select_menu = new JPanel();
select_menu.add(select);
select.addActionListener(this);
dialog.getContentPane().add(choice_menu, BorderLayout.NORTH);
dialog.getContentPane().add(select_menu, BorderLayout.CENTER);
setIconImage(title);
setResizable(false);
setSize(300, 335);
setVisible(true);
setLocationRelativeTo(null);
}
public static void main(String[] arg)
{
Gobang application = new Gobang();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent event)
{
if( event.getSource().equals(command[0]) )
{
if(steps.size()!=0)
undo();
}
else if(event.getSource().equals(command[1]) )
Save();
else if(event.getSource().equals(command[2]) )
Load();
else if(event.getSource().equals(command[3]) )
ReStart();
else
{
if(choice[1].isSelected())
{
temp=white;
white=black;
black=temp;
}
dialog.dispose();
}
}
public void WinCheck()
{
check = turn? Player: AI;
direction=oblique_1;
WinCheck2();
}
public void WinCheck2()
{
count=1;
switch(direction)
{
case oblique_1: displace_x=1;
displace_y=-1;
direction=oblique_2;
break;
case oblique_2: displace_x=displace_y=1;
direction=horizontal;
break;
case horizontal: displace_x=1;
displace_y=0;
direction=vertical;
break;
case vertical: displace_x=0;
displace_y=1;
direction=nil;
break;
}
x=locX+displace_x;
y=locY+displace_y;
while(x=0 xlength y=0 ylength grid[x][y]==check)
{
count=count+1;
x=x+displace_x;
y=y+displace_y;
}
x=locX-displace_x;
y=locY-displace_y;
while(x=0 xlength y=0 ylength grid[x][y]==check)
{
count=count+1;
x=x-displace_x;
y=y-displace_y;
}
if(count=5)
{
game_state=End;
winner=check;
ThreadStart();
}
else if(direction!=nil)
WinCheck2();
}
public void ReStart()
{
for(int i=0; ilength; i++)
for(int j=0; jlength; j++)
grids[i][j].Initial();
winner=0;
steps.clear();
game_state=Playing;
}
public void gobangRandom()
{
displace_y=0;
do
{
displace_x=(int)(Math.random()*8);
x =locX+dir[displace_x][0];
y =locY+dir[displace_x][1];
if(!dir2[displace_x])
{
displace_y=displace_y+1;
dir2[displace_x]=true;
}
}while((x0 || x=length || y0 || y=length || grid[x][y]!=0) displace_y8);
for(int i=0; i8; i++)
dir2[i]=false;
if(x=0 xlength y=0 ylength grid[x][y]==0)
setMark(x, y);
else
gobangRandom2();
}
private void gobangRandom2()
{
do
{
x=(int)(Math.random()*length);
y=(int)(Math.random()*length);
}while(grid[x][y]!=0);
setMark(x, y);
}
private void gobangAI()
{
boolean play=true;
for(int i=2; i0; i--)
{
play=!play;
gobangAI4(play);
if(turn)
return;
}
for(int i=7; i=4; i--)
{
play=!play;
step=i/2;
gobangAI2(play);
if(turn)
return;
}
gobangAI5();
if(!turn)
gobangRandom();
}
private void gobangAI2(boolean player)
{
check = player? Player: AI;
for(int i=0; ilength; i++)
for(int j=0; jlength; j++)
{
if(turn)
break;
if(grid[i][j] == check)
{
count=1;
direction=oblique_1;
gobangAI3(i, j);
}
}
}
private void gobangAI3(int x, int y)
{
if(count==1)
{
locX=x;
locY=y;
}
switch(direction)
{
case oblique_1: displace_x=1;
displace_y=-1;
break;
case oblique_2: displace_x=displace_y=1;
break;
case horizontal: displace_x=1;
displace_y=0;
break;
case vertical: displace_x=0;
displace_y=1;
break;
}
x=x+displace_x;
y=y+displace_y;
if(x=0 xlength y=0 ylength grid[x][y]==check)
{
count=count+1;
if(count==step)
{
if(x+displace_x=0 x+displace_xlength y+displace_y=0 y+displace_ylength grid[x+displace_x][y+displace_y]==0)
{
if(x-step*displace_x0 || x-step*displace_x=length || y-step*displace_y0 || y-step*displace_y=length || !gobang_SpaceAI(x+displace_x, y+displace_y) || (grid[x-step*displace_x][y-step*displace_y]!=0 step3) ) /* 癸翴�猵 */
gobangAI3_2();
else
setMark2(x+displace_x, y+displace_y);
}
else
gobangAI3_2();
}
else
gobangAI3(x, y);
}
else
gobangAI3_2();
}
private void gobangAI3_2()
{
if(direction!=vertical)
{
count=1;
direction=direction+1;
gobangAI3(locX, locY);
}
}
private void gobangAI4(boolean player)
{
check = player? Player: AI;
for(int i=0; ilength; i++)
for(int j=0; jlength; j++)
{
if(turn)
break;
if(grid[i][j]==0)
{
direction=oblique_1;
locX=i;
locY=j;
gobangAI4();
}
}
}
private void gobangAI4()
{
count=0;
switch(direction)
{
case oblique_1: displace_x=1;
displace_y=-1;
direction=oblique_2;
break;
case oblique_2: displace_x=displace_y=1;
direction=horizontal;
break;
case horizontal: displace_x=1;
displace_y=0;
direction=vertical;
break;
case vertical: displace_x=0;
displace_y=1;
direction=nil;
break;
}
x=locX+displace_x;
y=locY+displace_y;
while(x=0 xlength y=0 ylength grid[x][y]==check)
{
count=count+1;
x=x+displace_x;
y=y+displace_y;
}
x=locX-displace_x;
y=locY-displace_y;
while(x=0 xlength y=0 ylength grid[x][y]==check)
{
count=count+1;
x=x-displace_x;
y=y-displace_y;
}
if(count=4)
setMark(locX, locY);
else if(direction!=nil)
gobangAI4();
}
private void gobangAI5()
{
for(int i=0; ilength; i++)
for(int j=0; jlength; j++)
{
if(turn)
break;
if(grid[i][j]==-1)
{
direction=oblique_1;
locX=i;
locY=j;
gobangAI5_2();
}
}
}
/* 璸衡硈絬�フ耞糷 */
private void gobangAI5_2()
{
count=0;
switch(direction)
{
case oblique_1: displace_x=1;
displace_y=-1;
direction=oblique_2;
break;
case oblique_2: displace_x=displace_y=1;
direction=horizontal;
break;
case horizontal: displace_x=1;
displace_y=0;
direction=vertical;
break;
case vertical: displace_x=0;
displace_y=1;
direction=nil;
break;
}
x=locX+displace_x;
y=locY+displace_y;
while(x=0 xlength y=0 ylength grid[x][y]==0 count4)
{
count=count+1;
x=x+displace_x;
y=y+displace_y;
}
x=locX-displace_x;
y=locY-displace_y;
if(count==4 x=0 xlength y=0 ylength grid[x][y]==0)
setMark(locX+displace_x, locY+displace_y);
else if(count1)
{
count = count==4? 3: count;
while(x=0 xlength y=0 ylength grid[x][y]==0 count4)
{
count=count+1;
x=x-displace_x;
y=y-displace_y;
}
if(count==4)
setMark(locX+displace_x, locY+displace_y);
else if(direction!=nil)
gobangAI5_2();
}
else if(direction!=nil)
gobangAI5_2();
}
private boolean gobang_SpaceAI(int x, int y) /* 璸衡逞缁�フ�竚 */
{
int space=0;
do
{
space=space+1;
x=x+displace_x;
y=y+displace_y;
}while(x=0 xlength y=0 ylength grid[x][y]==0 space4);
if(space+count=5) /* 逞缁�フ场だΤ硈絬ぇ�� */
return true;
else
{
space=0;
x=locX-displace_x;
y=locY-displace_y;
while(x=0 xlength y=0 ylength grid[x][y]==0 space4)
{
space=space+1;
x=x-displace_x;
y=y-displace_y;
}
if(space+count=5) /* 逞缁�フ场だΤ硈絬ぇ�� */
return true;
else
return false;
}
}
public void ThreadStart()
{
new Thread(this).start();
}
private void setMark(int x, int y)
{
steps.add(grids[x][y]);
grids[x][y].setValue(-1);
WinCheck();
turn=true;
}
/* 璸衡�ê�よ�Τ�隔 */
private void setMark2(int x, int y)
{
int space=0, temp_x=x, temp_y=y;
do
{
space=space+1;
temp_x=temp_x+displace_x;
temp_y=temp_y+displace_y;
}while(temp_x=0 temp_xlength temp_y=0 temp_ylength grid[temp_x][temp_y]==0 space4);
if(space+step=5)
setMark(x, y);
else
setMark(x-(step+1)*displace_x, y-(step+1)*displace_y); /* э�癸翴 */
}
public void run()
{
try
{
switch(game_state)
{
case Start: Thread.sleep(2000);
dialog.show();
game_state=Playing;
repaint();
break;
case End: repaint();
Thread.sleep(1500);
ReStart();
repaint();
break;
}
}
catch(InterruptedException ex)
{
}
}
public void paint(Graphics g)
{
super.paint(g);
switch(game_state)
{
case Start: g.drawString("2005.7 by Yu Lin Tao", 91, 240);
g.setFont(font);
g.setColor(Color.BLUE);
g.drawString("Gobang", 112, 120);
g.drawImage(title, 134, 135, this);
break;
case Playing:
case End:
g.drawString("�产: 筿福:", 105, 40);
g.drawImage(black, 132, 30, this);
g.drawImage(white, 182, 30, this);
if(winner!=0)
{
g.setFont(font);
g.setColor(Color.RED);
message = winner==1? "�墓�":"�块�";
g.drawString(message, 120, 185);
}
break;
}
}
public void undo()
{
if(steps.size()0)
{
for(int i=0; i2; i++)
{
((Grid)steps.get(steps.size()-1)).Initial();
steps.remove(steps.size()-1);
}
}
}
private void Save()
{
String str;
try
{
File file = new File("innings.men");
file.createNewFile();
BufferedWriter write = new BufferedWriter(new FileWriter(file));
for(int i=0; isteps.size(); i++)
{
str=(((Grid)steps.get(i)).getLocX())+","+(((Grid)steps.get(i)).getLocY())+","+(((Grid)steps.get(i)).getValue());
write.write(str);
write.newLine();
}
write.close();
}
catch(Exception ex)
{
}
}
private void Load()
{
try
{
String[] step_array;
String str;
File file = new File("innings.men");
if(!file.exists())
{
JOptionPane.showMessageDialog(null, "⊿Τ�郎");
return;
}
BufferedReader read = new BufferedReader(new FileReader(file));
ReStart();
while(read.ready())
{
str=read.readLine();
step_array=str.split(",");
grids[Integer.parseInt(step_array[0])][Integer.parseInt(step_array[1])].setValue(Integer.parseInt(step_array[2]));
steps.add(grids[Integer.parseInt(step_array[0])][Integer.parseInt(step_array[1])]);
}
}
catch(Exception ex)
{
}
}
private class Grid extends JPanel implements MouseListener
{
int x, y, value;
boolean selected;
public Grid(int x, int y)
{
this.x=x;
this.y=y;
addMouseListener(this);
}
public void mousePressed(MouseEvent event)
{
if(game_state==Playing)
{
int button=event.getButton();
if(button==MouseEvent.BUTTON1)
{
if(value==0)
{
steps.add(this);
setValue(1);
WinCheck();
turn=false;
if(game_state==Playing)
gobangAI();
}
}
else
control_menu.show(this, event.getX(), event.getY());
}
}
public void mouseEntered(MouseEvent event)
{
if(game_state==Playing)
setSelected(true);
}
public void mouseExited(MouseEvent event)
{
if(game_state==Playing)
setSelected(false);
}
public void mouseClicked(MouseEvent event)
{
}
public void mouseReleased(MouseEvent event)
{
}
public Dimension getPreferredSize()
{
return new Dimension(20, 20);
}
public Dimension getMinimumSize()
{
return getPreferredSize();
}
public int getLocX()
{
return x;
}
public int getLocY()
{
return y;
}
public int getValue()
{
return value;
}
public void Initial()
{
value=grid[x][y]=0;
selected=false;
repaint();
}
public void setValue(int new_value)
{
locX=x;
locY=y;
value=grid[x][y]=new_value;
repaint();
}
public void setSelected(boolean select)
{
selected=select;
repaint();
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
if(game_state!=Start game_state!=Select)
{
g.drawLine(0, 10, 19, 10);
g.drawLine(10, 0, 10, 19);
/* 礶娩絬 */
g.setColor(Color.BLUE);
if(x==0)
g.drawLine(0, 0, 19, 0);
else if(x==length-1)
g.drawLine(0, 19, 19, 19);
if(y==0)
g.drawLine(19, 0, 19, 19);
else if(y==length-1)
g.drawLine(0, 0, 0, 19);
if(selected)
setBackground(Color.WHITE);
else
setBackground(Color.LIGHT_GRAY);
}
//g.drawString(x+" "+y, 1, 10);
if(value!=0)
{
temp = value==1? black: white;
g.drawImage(temp, 4, 4, this);
}
}
}
}
不急的话后天帮你弄，这两天有事！541617772@qq.com邮箱。建议你换个myEclipse版本7.0太太太旧了，都出到2014了，7.0基本上公司都淘汰了
