运行applet时提示没有错误,下面也提示小程序已启动.但就是运行界面是黑的,怎回事啊?
估计不是程序的问题.但偶还是不知道问题出在哪?
我用的是eclipse
请各位指点指点啊!

你还是把代码发上来吧 我以前也出现过这样的毛病 结果使自己的代码有问题
你把他放进网页也显示不出来么？试试

//TDMessage.java
import java.applet.Applet;
import java.awt.*;
import java.util.StringTokenizer;

public class TDMessage extends Applet
implements Runnable
{
//变量定义
Thread m_TDMessage = null;
Image off = null;
Graphics g_off = null;
Font font = null;
FontMetrics fm = null;
Dimension d = null;
int font_style = 0;
int center_x = 0;
boolean gSok = false;
boolean on_the_move = false;
private int m_speed = 0;
private int m_size = 0;
private int m_3d_size = 0;
private int m_delay = 0;
private String m_messagefont = null;
private boolean m_bold = false;
private boolean m_italic = false;
private int m_movedelay = 0;
private int m_num_msg = 0;
private String m_msg[] = null;
private int m_heading[] = null;
Color m_bgcolor = null;
//启动小程序
public void start()
{
if(m_TDMessage == null)
{
m_TDMessage = new Thread(this);
m_TDMessage.start();
}
}
//停止小程序
public void stop()
{
if(m_TDMessage != null)
{
m_TDMessage.stop();
m_TDMessage = null;
}
}
//构造函数
public TDMessage()
{
m_speed = 40;
m_size = 24;
m_3d_size = 10;
m_delay = 3000;
m_messagefont = "arial";
m_movedelay = 10;
m_bgcolor = Color.white;
}
//制作3d文字
public void draw3d(Graphics g)
{
int i = 0;
int y = 0;
int move = 0;
if(!gSok)
{
y = (d.height - m_size) / 2 + m_size;
g.drawString("Invalid 'Notice' Param", 0, y);
g_off.drawString("Invalid 'Notice' Param", 0, y);
return;
}
y = d.height / 2 + (fm.getAscent() + fm.getLeading()) / 2;
for(int k = 0; k < m_num_msg; k++)
{
center_x = d.width / 2 - fm.stringWidth(m_msg[k]) / 2 - 255 / m_3d_size;
i = 0;
do
{
move++;
g.drawString(m_msg[k], center_x + move, y);
g.setColor(new Color(i, i, i));
g_off.drawString(m_msg[k], center_x + move, y);
g_off.setColor(new Color(i, i, i));
try
{
Thread.sleep(m_speed);
}
catch(InterruptedException e) { }
i += m_3d_size;
}
while(i < 255);
try
{
Thread.sleep(1000L);
}
catch(InterruptedException e) { }
i = 255;
do
{
g.drawString(m_msg[k], center_x + move, y);
g.setColor(new Color(i, i, i));
g_off.drawString(m_msg[k], center_x + move, y);
g_off.setColor(new Color(i, i, i));
try
{
Thread.sleep(m_speed);
}
catch(InterruptedException e) { }
i -= m_3d_size;
}
while(i > 0);
move = 0;
try
{
Thread.sleep(m_delay);
}
catch(InterruptedException e) { }
on_the_move = true;
if(m_heading[k] == 2)
{
for(int j = 0; j <= d.height; j++)
{
g.drawImage(off, 0, j, this);
try
{
Thread.sleep(m_movedelay);
}
catch(InterruptedException e) { }
}

}
if(m_heading[k] == 0)
{
for(int j = 0; j >= -d.height; j--)
{
g.drawImage(off, 0, j, this);
try
{
Thread.sleep(m_movedelay);
}
catch(InterruptedException e) { }
}

}
if(m_heading[k] == 1)
{
for(int j = 0; j <= d.width; j++)
{
g.drawImage(off, j, 0, this);
try
{
Thread.sleep(m_movedelay);
}
catch(InterruptedException e) { }
}

}
if(m_heading[k] == 3)
{
for(int j = 0; j >= -d.width; j--)
{
g.drawImage(off, j, 0, this);
try
{
Thread.sleep(m_movedelay);
}
catch(InterruptedException interruptedexception) { }
}

}
DrawBG(g);
on_the_move = false;
}

}
//填充颜色
public void DrawBG(Graphics g)
{
g.setColor(m_bgcolor);
g.fillRect(0, 0, d.width, d.height);
g_off.setColor(m_bgcolor);
g_off.fillRect(0, 0, d.width, d.height);
}
//运行小程序
public void run()
{
do
try
{
draw3d(getGraphics());
Thread.sleep(50L);
}
catch(InterruptedException e)
{
stop();
}
while(true);
}
//转换颜色
public Color ConvertColor(String temp)
{
int r = 0;
int g = 0;
int b = 0;
temp.trim();
StringTokenizer st = new StringTokenizer(temp, ",");
if(st.countTokens() > 3)
return Color.black;
while(st.hasMoreTokens())
{
r = Integer.parseInt(st.nextToken().trim());
g = Integer.parseInt(st.nextToken().trim());
b = Integer.parseInt(st.nextToken().trim());
}

st = null;
if(r > 255)
r = 255;
if(g > 255)
g = 255;
if(b > 255)
b = 255;
Color ctemp = new Color(r, g, b);
return ctemp;
}
//初始化小程序
public void init()
{
String crstr = "3D Message Effect";
d = size();
String param = getParameter("Notice");
if(param != null)
if(param.equals(crstr))
gSok = true;
else
gSok = false;
param = getParameter("delay3d");
if(param != null)
m_speed = Integer.parseInt(param);
param = getParameter("numofmessages");
if(param != null)
m_num_msg = Integer.parseInt(param);
param = getParameter("movedelay");
if(param != null)
m_movedelay = Integer.parseInt(param);
param = getParameter("size");
if(param != null)
m_size = Integer.parseInt(param);
param = getParameter("font");
if(param != null)
m_messagefont = param;
param = getParameter("3dsize");
if(param != null)
m_3d_size = Integer.parseInt(param);
param = getParameter("delay");
if(param != null)
m_delay = Integer.parseInt(param);
param = getParameter("bgcolor");
if(param != null)
{
m_bgcolor = ConvertColor(param);
setBackground(m_bgcolor);
}
else
{
m_bgcolor = new Color(0);
setBackground(m_bgcolor);
}
param = getParameter("italic");
if(param != null)
m_italic = Boolean.valueOf(param).booleanValue();
param = getParameter("bold");
if(param != null)
m_bold = Boolean.valueOf(param).booleanValue();
if(m_bold)
font_style = font_style + 1;
if(m_italic)
font_style = font_style + 2;
setFont(font = new Font(m_messagefont, font_style, m_size));
fm = getFontMetrics(font);
m_msg = new String[m_num_msg];
m_heading = new int[m_num_msg];
for(int i = 0; i < m_num_msg; i++)
{
param = getParameter("desc" + i);
if(param != null)
m_msg[i] = new String(param);
else
m_msg[i] = new String(" ");
param = getParameter("heading" + i);
if(param != null)
{
m_heading[i] = Integer.parseInt(param);
if(m_heading[i] > 3 && m_heading[i] < 0)
m_heading[i] = 4;
}
else
{
m_heading[i] = (int)(Math.random() * 4D);
}
}

off = createImage(d.width, d.height);
g_off = off.getGraphics();
g_off.setFont(font = new Font(m_messagefont, font_style, m_size));
}
//画屏函数
public void paint(Graphics g)
{
if(!on_the_move)
g.drawImage(off, 0, 0, this);
}
}

在原本的网页中 可以
看是我把它放到自己练习的目录就不可以了
觉得很奇怪

应该是你没装JRE的缘故 或是你的浏览器不支持APPLET

楼上的 你在装JDK的时候不可能不给你装JRE的

tree 你有把一个*.class的文件给拖进classes这个文件夹内吗？

我今天重装系统后 编译运行依然可以 可是APPLET就不行了 重装后就好使了
我理解的可能不对
但你能把我的情况解释一下 可以吗?