我是一個開始Java程序員。我正在嘗試構建一個可以直接在控制檯中玩的太空侵略者遊戲。後來,我想通過JFrame添加一個圖形界面;然而,在這個時候,我限制自己創建一個非功能性的JFrame窗口。我將這些類保存在幾個文件中 - Constants.java,Entity.java,Player.java和Board.java,SpaceInvaders.java - 並且我已經按照指定的順序編譯了這些文件。我的問題是,當我嘗試運行主要方法時,沒有顯示任何內容。沒有窗口彈出。控制檯中不顯示任何輸出。我懷疑問題出在班級委員會,也許在方法gameInit()或方法run()中的線程構造中。我在課程教材中找不到關於主題的任何信息 - 我從網站http://zetcode.com/tutorials/javagamestutorial/spaceinvaders/獲得了線程代碼,我會在項目的最終版本中引用它。這個線程爲什麼不工作?
請讓我知道,如果你能給我任何指針。我對我不熟悉stackoverflow.com的格式表示歉意。
我在下面附上我的代碼的副本。
Constants.java
import java.io.*;
public interface Constants {
public static final int MOTION_WIDTH = 20;
public static final int MOTION_LENGTH = 20;
public static final int DELAY = 17;
}
Entity.java
import java.io.*;
public class Entity {
private int xPosition;
private int yPosition;
public void setXPosition(int newXPosition) {
this.xPosition = newXPosition;
}
public int getXPosition() {
return xPosition;
}
public void setYPosition(int newYPosition) {
this.yPosition = newYPosition;
}
public int getYPosition() {
return yPosition;
}
}
Player.java
import java.io.*;
import java.awt.event.KeyEvent;
public class Player extends Entity implements Constants{
private final int START_X_POSITION = 0;
private final int START_Y_POSITION = 0;
int x = 0;
public Player() {
setXPosition(START_X_POSITION);
setYPosition(START_Y_POSITION);
}
public void move() {
setXPosition((getXPosition()) + x);
if ((getXPosition()) <= 0) {
setXPosition(0);
}
if ((getXPosition()) >= MOTION_WIDTH) {
setXPosition(MOTION_WIDTH);
}
}
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
x = 1;
} else if (e.getKeyCode() == KeyEvent.VK_LEFT) {
x = -1;
}
}
public void keyReleased(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
x = 0;
} else if (e.getKeyCode() == KeyEvent.VK_LEFT) {
x = 0;
}
}
}
Board.java
import java.io.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.event.KeyEvent;
import java.awt.event.KeyAdapter;
public class Board extends JPanel implements Runnable, Constants {
Player player;
boolean gameRunning = true;
Thread animator;
char[][] motion = new char[MOTION_WIDTH][MOTION_LENGTH];
public Board() {
addKeyListener(new KeyListener());
setFocusable(true);
gameInit();
setDoubleBuffered(true);
}
//Ensure that I cite this
public void addNotify() {
super.addNotify();
gameInit();
}
public void gameInit() {
player = new Player();
for (int i = 0; i < MOTION_WIDTH; i++) {
for (int j = 0; j < MOTION_LENGTH; j++) {
motion[i][j] = '0';
}
}
motion[0][0] = '^';
if (animator == null) {
animator = new Thread(this);
animator.start();
}
}
private class KeyListener extends KeyAdapter {
public void keyPressed(KeyEvent e) {
player.keyPressed(e);
}
public void keyReleased(KeyEvent e) {
player.keyReleased(e);
}
}
public void paint() {
for (int i = 0; i < MOTION_WIDTH; i++) {
for (int j = 0; j < MOTION_LENGTH; j++) {
motion[i][j] = '0';
}
}
motion[player.getXPosition()][player.getYPosition()] = '^';
for (int i = 0; i < MOTION_WIDTH; i++) {
for (int j = 0; j < MOTION_LENGTH; j++) {
System.out.print(motion[i][j]);
}
System.out.println();
}
}
public void animationCycle() {
player.move();
paint();
}
//Ensure that I cite this
public void run() {
long beforeTime, timeDiff, sleep;
beforeTime = System.currentTimeMillis();
while (gameRunning) {
paint();
animationCycle();
timeDiff = System.currentTimeMillis() - beforeTime;
sleep = DELAY - timeDiff;
if (sleep < 0)
sleep = 2;
try {
Thread.sleep(sleep);
} catch (InterruptedException e) {
System.out.println("interrupted");
}
beforeTime = System.currentTimeMillis();
}
}
}
SpaceInvaders.java
import java.io.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyAdapter;
public class SpaceInvaders extends JFrame implements Constants {
public void SpaceInvaders() {
add(new Board());
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(500, 500);
setVisible(true);
requestFocusInWindow();
}
public static void main(String[] args) {
new SpaceInvaders();
}
}
'公共無效太空侵略者()'不是構造函數。嘗試從該行刪除'void'。 –