【发布时间】：2017-01-18 17:38:51
【问题描述】：
我正在从 Ian Cinnamon 的《为邪恶的天才编程视频游戏》一书中学习 Java，还有这款赛车游戏。我了解它是如何工作的，但我有一个问题：每次刷新(Thread.sleep) 时它都会闪烁。我该如何解决？顺便说一句，我看到了 4 年前的帖子，但由于我是初学者，所以我不明白如何做，我认为我不应该恢复它。
这是代码，提前谢谢你：
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
public class RadicalRacing extends JFrame {
final int WIDTH = 900, HEIGHT = 650;
double p1Speed = .5, p2Speed = .5;
final int UP = 0, RIGHT = 1, DOWN = 2, LEFT = 3;
int p1Direction = UP;
int p2Direction = UP;
Rectangle left = new Rectangle(0, 0, WIDTH / 9, HEIGHT);
Rectangle right = new Rectangle((WIDTH / 9) * 8, 0, WIDTH, HEIGHT);
Rectangle top = new Rectangle(0, 0, WIDTH, HEIGHT / 9);
Rectangle bottom = new Rectangle(0, (HEIGHT / 9) * 8, WIDTH, HEIGHT / 9);
Rectangle center = new Rectangle((int) ((WIDTH / 9) * 2.5), (int) ((HEIGHT / 9) * 2.5), (int) ((WIDTH / 9) * 5), (HEIGHT / 9) * 4);
Rectangle obstacle = new Rectangle(WIDTH / 2, (int) ((HEIGHT / 9) * 7), WIDTH / 10, HEIGHT);
Rectangle obstacle2 = new Rectangle(WIDTH / 3, (int) ((HEIGHT / 9) * 5), WIDTH / 10, HEIGHT / 4);
Rectangle obstacle3 = new Rectangle(2 * (WIDTH / 3), (int) ((HEIGHT / 9) * 5), WIDTH / 10, HEIGHT / 4);
Rectangle obstacle4 = new Rectangle(WIDTH / 3, HEIGHT / 9, WIDTH / 10, HEIGHT / 9);
Rectangle obstacle5 = new Rectangle(WIDTH / 2, (int) ((HEIGHT / 9) * 1.5), WIDTH / 30, HEIGHT / 4);
Rectangle finish = new Rectangle(WIDTH / 9, (HEIGHT / 2) - HEIGHT / 9, (int) ((WIDTH / 9) * 1.5),
HEIGHT / 70);
Rectangle lineO = new Rectangle(WIDTH / 9, HEIGHT / 2, (int) ((WIDTH / 9) * 1.5) / 2, HEIGHT / 140);
Rectangle lineI = new Rectangle(((WIDTH / 9) + ((int) ((WIDTH / 9) * 1.5) / 2)),
(HEIGHT / 2) + (HEIGHT / 10), (int) ((WIDTH / 9) * 1.5) / 2, HEIGHT / 140);
Rectangle p1 = new Rectangle(WIDTH / 9, HEIGHT / 2, WIDTH / 30, WIDTH / 30);
Rectangle p2 = new Rectangle(((WIDTH / 9) + ((int) ((WIDTH / 9) * 1.5) / 2)), (HEIGHT / 2)
+ (HEIGHT / 10), WIDTH / 30, WIDTH / 30);
public RadicalRacing() {
super("Radical Racing");
setSize(WIDTH, HEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
Move1 m1 = new Move1();
Move2 m2 = new Move2();
m1.start();
m2.start();
}
public void paint(Graphics g) {
super.paint(g);
//draw the background
g.setColor(Color.DARK_GRAY);
g.fillRect(0, 0, WIDTH, HEIGHT);
//green border
g.setColor(Color.GREEN);
//now, using rectangles, draw it
g.fillRect(left.x, left.y, left.width, left.height);
g.fillRect(right.x, left.y, left.width, left.height);
g.fillRect(top.x, top.y, top.width, top.height);
g.fillRect(bottom.x, bottom.y, bottom.width, bottom.height);
g.fillRect(center.x, center.y, center.width, center.height);
g.fillRect(obstacle.x, obstacle.y, obstacle.width, obstacle.height);
g.fillRect(obstacle2.x, obstacle2.y, obstacle2.width, obstacle2.height);
g.fillRect(obstacle3.x, obstacle3.y, obstacle3.width, obstacle3.height);
g.fillRect(obstacle4.x, obstacle4.y, obstacle4.width, obstacle4.height);
g.fillRect(obstacle5.x, obstacle5.y, obstacle5.width, obstacle5.height);
g.setColor(Color.WHITE);
g.fillRect(lineO.x, lineO.y, lineO.width, lineO.height);
g.fillRect(lineI.x, lineI.y, lineI.width, lineI.height);
g.setColor(Color.YELLOW);
g.fillRect(finish.x, finish.y, finish.width, finish.height);
g.setColor(Color.BLUE);
g.fillRect(p1.x, p1.y, p1.width, p1.height);
g.setColor(Color.RED);
g.fillRect(p2.x, p2.y, p2.width, p2.height);
}
private class Move1 extends Thread implements KeyListener {
public void run() {
addKeyListener(this);
while (true) {
try {
repaint();
if (p1.intersects(right) || p1.intersects(left)
|| p1.intersects(top) || p1.intersects(bottom)
|| p1.intersects(obstacle) || p1.intersects(obstacle2)
|| p1.intersects(obstacle3) || p1.intersects(obstacle4)
|| p1.intersects(obstacle5) || p1.intersects(p2)) {
p1Speed = -4;
}
if (p1.intersects(center)) {
p1Speed = -2.5;
}
if (p1Speed <= 5) {
p1Speed += .2;
}
if (p1Direction == UP) {
p1.y -= (int) (p1Speed);
}
if (p1Direction == DOWN) {
p1.y += (int) (p1Speed);
}
if (p1Direction == LEFT) {
p1.x -= (int) (p1Speed);
}
if (p1Direction == RIGHT) {
p1.x += (int) (p1Speed);
}
Thread.sleep(75);
} catch (Exception e) {
break;
}
}
}
public void keyPressed(KeyEvent event) {
}
public void keyReleased(KeyEvent event) {
}
public void keyTyped(KeyEvent event) {
if (event.getKeyChar() == 'a') {
p1Direction = LEFT;
}
if (event.getKeyChar() == 'd') {
p1Direction = RIGHT;
}
if (event.getKeyChar() == 's') {
p1Direction = DOWN;
}
if (event.getKeyChar() == 'w') {
p1Direction = UP;
}
}
}
private class Move2 extends Thread implements KeyListener {
public void run() {
addKeyListener(this);
while (true) {
try {
repaint();
if (p2.intersects(right) || p2.intersects(left)
|| p2.intersects(top) || p2.intersects(bottom)
|| p2.intersects(obstacle) || p2.intersects(obstacle2)
|| p2.intersects(obstacle3) || p2.intersects(obstacle4)
|| p2.intersects(obstacle5) || p2.intersects(p1)) {
p2Speed = -4;
}
if (p2.intersects(center)) {
p2Speed = -2.5;
}
if (p2Speed <= 5) {
p2Speed += .2;
}
if (p2Direction == UP) {
p2.y -= (int) (p2Speed);
}
if (p2Direction == DOWN) {
p2.y += (int) (p2Speed);
}
if (p2Direction == LEFT) {
p2.x -= (int) (p2Speed);
}
if (p2Direction == RIGHT) {
p2.x += (int) (p2Speed);
}
Thread.sleep(75);
} catch (Exception e) {
break;
}
}
}
public void keyPressed(KeyEvent event) {
}
public void keyReleased(KeyEvent event) {
}
public void keyTyped(KeyEvent event) {
if (event.getKeyChar() == 'h') {
p2Direction = LEFT;
}
if (event.getKeyChar() == 'k') {
p2Direction = RIGHT;
}
if (event.getKeyChar() == 'j') {
p2Direction = DOWN;
}
if (event.getKeyChar() == 'u') {
p2Direction = UP;
}
}
}
public static void main(String[] args) {
new RadicalRacing();
}
}
【问题讨论】：
-
您尝试了什么（例如，移除或更改睡眠）？发生了什么？你预计会发生什么？
-
不要覆盖
paint- 覆盖轻量级组件的paintComponent（例如JPanel）。见docs.oracle.com/javase/tutorial/uiswing/painting/closer.html -
如果这对你有帮助，请你批准这个冷笑。
标签： java