我认为这很奇怪，因为我之前在Eclipse上运行它时，这个程序很有效。但是，当我尝试使用'java PacMan'运行它时，没有任何显示。我认为这是因为我错过了一个主要方法，但我不确定如何将其整合到我的程序中而不会搞砸所有内容。
/*
PacMan.java
This is a lame replica of the game PacMan. The PacMan
starts out on a random location on the board with
6 ghosts & cheese. It must try to eat the cheese without
getting eaten by the ghosts. The ghosts only move around
when PacMan does. All characters on the board can only move
around when PacMan does and can only move up, down, left,
and right; diagonal movement isn't allowed. When PacMan eats
all the cheese, the words 'YOU WIN! :)' will be displayed across
the board; if you lose, 'YOU LOST! :(' will be shown.
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class PacMan extends JApplet implements KeyListener
{
private int chez, ghosts;
private int currentx, currenty, direction, a;
private int [][] grid;
private int [] alienx, alieny;
private DrawingArea canvas;
private boolean lost;
public void init()
{
setSize(500, 560);
generateBoard();
canvas = new DrawingArea(); // drawing area
getContentPane().add(canvas, BorderLayout.CENTER);
JPanel buttonPanel = new ButtonPanel();
getContentPane().add(buttonPanel, BorderLayout.SOUTH);
canvas.setBackground(Color.black);
canvas.addKeyListener(this);
canvas.requestFocus();
}
public void generateBoard()
{
lost = false;
chez = ghosts = currentx = currenty = 0;
grid = new int[10][10]; // sets 2D array size
alienx = new int[6];
alieny = new int[6];
do
{
currentx = (int)(Math.random() * 10);
currenty = (int)(Math.random() * 10);
if(grid[currentx][currenty] == 0 && chez < 6)
{
grid[currentx][currenty] = 1; // placement holder because 0 won't be read in
chez++; // '1' is the cheese
}
if(grid[currentx][currenty] == 0 && ghosts < 6)
{
grid[currentx][currenty] = 2; // placement holder because 0 won't be read in
alienx[ghosts] = currentx;
alieny[ghosts] = currenty;
ghosts++; // '2' is the ghosts
}
}
while(chez < 6 || ghosts < 6);
do // this makes sure PacMan never respawns on a ghost or cheese
{
currentx = (int)(Math.random() * 10);
currenty = (int)(Math.random() * 10);
}
while(grid[currentx][currenty] != 0);
grid[currentx][currenty] = 3; // this is PacMan
direction = 0;
}
public void moveGhosts(int a)
{
int oldx = alienx[a], oldy = alieny[a]; // coordinates of the aliens
grid[oldx][oldy] = 0; // erases original spacing for monster/alien
int stuff; // used for random statement
boolean done = true;
stuff = (int)(Math.random() * 8 + 1); // amount of random moves XD
do
{
switch(stuff)
{
case 1: alienx[a]++; break; // down
case 2: alienx[a]--; break; // up
case 3: alieny[a]++; break; // right
case 4: alieny[a]--; break; // left
case 5: alienx[a]++; alieny[a]--; break; // down, left
case 6: alienx[a]++; alieny[a]++; break; // down, right
case 7: alienx[a]--; alieny[a]--; break; // up, left
case 8: alienx[a]--; alieny[a]++; break; // up, right
}
if(alieny[a] == 10)
alieny[a] = 0;
if(alieny[a] == -1)
alieny[a] = 9;
if(alienx[a] == 10)
alienx[a] = 0;
if(alienx[a] == -1)
alienx[a] = 9;
if(grid[alienx[a]][alieny[a]] == 0 || grid[currentx][currenty] == 3)
done = true; // only runs when ghost is on empty space or eats PacMan
else
done = false; // makes sure ghost never eats cheese
for(int b = 0; b < 6; b++)
if(alienx[b] == alienx[a] && alieny[b] == alieny[a] && b != a)
done = false; // prevents ghosts from overlaping each other
if (!done)
{
oldx = alienx[a];
oldy = alieny[a];
}
} while (!done);
grid[alienx[a]][alieny[a]] = 2;
}
class DrawingArea extends JPanel
{
public void paintComponent(Graphics g)
{
super.paintComponent(g);
displayBoard(g);
this.requestFocus();
}
public void displayBoard(Graphics g)
{
g.setColor(Color.gray);
g.fillRect(116, 464, 270, 50); // gray background for board
g.fillRect(30, 10, 445, 445); // gray background for 'cheese remaining'
g.setColor(Color.yellow);
g.drawRect(116, 464, 270, 50); // outlines 'cheese remaining' box
if(grid[currentx][currenty] == 1) // makes cheese disappear when PacMan eats it
{
grid[currentx][currenty] = 0;
chez--;
}
if(grid[currentx][currenty] == 2) // makes PacMan disappear when he hits a ghost
lost = true;
Font progress = new Font("Sans Serif", Font.PLAIN, 25);
g.setFont(progress);
if(!lost && chez > 0)
g.drawString("Cheese Remaining:"+ chez, 130, 500); // shows # of cheese left
else if(lost == true)
g.drawString("YOU LOST! :(", 175, 500);
else if(chez == 0)
g.drawString("YOU WON! :)", 175, 500);
g.setColor(Color.white);
for(int row = 0; row < grid.length; row++)
for(int col = 0; col < grid[row].length; col++)
{
g.setColor(Color.white);
g.fillRect(30 + col * 45, 10 + row * 45, 40, 40); // prints grid
g.setColor(Color.blue); // primitive PacMan
if(!lost)
g.fillArc(30 + currentx * 45, 10 + currenty * 45, 40, 40, direction + 30, 300);
if(grid[col][row] == 1) // prints out cheese randomly if array encounters invisible '1'
{
// while scanning
g.setColor(Color.yellow);
g.fillRect(33 + col * 45, 13 + row * 45, 33, 33); // blocks of cheese
}
if(grid[col][row] == 2) // prints out ghosts randomly if array encounters invisible '2'
{
// while scanning
g.setColor(Color.red);
g.fillOval(30 + col * 45, 10 + row * 45, 40, 40); // ghosts' body
g.setColor(Color.black);
g.fillOval(38 + col * 45, 20 + row * 45, 8, 8); // left eye
g.fillOval(53 + col * 45, 20 + row * 45, 8, 8); // right eye
g.drawLine(38 + col * 45, 37 + row * 45, 61 + col * 45, 37 + row * 45); // mouth
}
}
}
}
public void keyPressed(KeyEvent evt)
{
int value = evt.getKeyCode();
if(!lost && chez > 0)
switch(value)
{
case KeyEvent.VK_LEFT:
{
currentx--; // PacMan moves left
if(currentx == -1) // makes sure the PacMan can 'loop' around through 'portals'
currentx = 9;
direction = 180; //faces left
for(int a = 0; a < 6; a++)
moveGhosts(a);
} break;
case KeyEvent.VK_RIGHT:
{
currentx++; // PacMan moves right
if(currentx == 10) // makes sure the PacMan can 'loop' around through 'portals'
currentx = 0;
direction = 0; //faces right
for(int a = 0; a < 6; a++)
moveGhosts(a);
} break;
case KeyEvent.VK_UP:
{
currenty--; // PacMan moves up
if(currenty == -1) // makes sure the PacMan can 'loop' around through 'portals'
currenty = 9;
direction = 90; //faces up
for(int a = 0; a < 6; a++)
moveGhosts(a);
} break;
case KeyEvent.VK_DOWN:
{
currenty++; // PacMan moves down
if(currenty == 10) // makes sure the PacMan can 'loop' around through 'portals'
currenty = 0;
direction = 270; //faces down
for(int a = 0; a < 6; a++)
moveGhosts(a);
} break;
}
if(value == KeyEvent.VK_SPACE)
generateBoard(); // call on method to regenerate board
canvas.repaint(); // repaints the board
}
class ButtonPanel extends JPanel implements ActionListener
{
private JButton left, right, up, down, reset;
public ButtonPanel() // displays available buttons
{
left = new JButton("LEFT");
left.addActionListener(this);
this.add(left);
right = new JButton("RIGHT");
right.addActionListener(this);
this.add(right);
up = new JButton("UP");
up.addActionListener(this);
this.add(up);
down = new JButton("DOWN");
down.addActionListener(this);
this.add(down);
reset = new JButton("RESET");
reset.addActionListener(this);
this.add(reset);
}
public void actionPerformed(ActionEvent evt)
{
String command = evt.getActionCommand();
if(!lost && chez > 0)
{
if(command.equals("LEFT"))
{
currentx--; // PacMan moves left
if(currentx == -1) // makes sure the PacMan can 'loop' around through 'portals'
currentx = 9;
direction = 180; //faces left
for(int a = 0; a < 6; a++)
moveGhosts(a);
}
else if(command.equals("RIGHT"))
{
currentx++; // PacMan moves right
if(currentx == 10) // makes sure the PacMan can 'loop' around through 'portals'
currentx = 0;
direction = 0; //faces right
for(int a = 0; a < 6; a++)
moveGhosts(a);
}
else if(command.equals("UP"))
{
currenty--; // PacMan moves up
if(currenty == -1) // makes sure the PacMan can 'loop' around through 'portals'
currenty = 9;
direction = 90; //faces up
for(int a = 0; a < 6; a++)
moveGhosts(a);
}
else if(command.equals("DOWN"))
{
currenty++; // PacMan moves down
if(currenty == 10) // makes sure the PacMan can 'loop' around through 'portals'
currenty = 0;
direction = 270; //faces down
for(int a = 0; a < 6; a++)
moveGhosts(a);
}
}
if(command.equals("RESET"))
generateBoard(); // call on method to regenerate board
canvas.repaint(); // repaints the board
}
}
public void keyTyped(KeyEvent evt) {}
public void keyReleased(KeyEvent evt) {}
public void actionPerformed(ActionEvent evt) {}
}
答案 0 :(得分：3)
就像他们在评论中所说的那样，因为它是一个小程序，你不能把它当作常规的Java应用程序。但是，您可以将其嵌入浏览器中，也可以使用java工具appletviewer在没有浏览器的情况下运行它。在命令行中键入以下内容：
appletviewer [options] myApplet.html
只需在文件夹中添加myApplet.html：
<Html>
<Head>
<Title>Pac Man Applet</Title>
</Head>
<Body>
<Applet Code="MyApplet.class" width=200 Height=100>
</Applet>
</Body>
</Html>
附加选项是创建一个存根应用程序，允许您在Java应用程序中运行applet：Here is link to example.示例代码位于底部。