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我很難弄清楚爲什麼當我試圖繪製它時槳會閃爍。我知道我可以使用JFrame，但是我使用awt的原因是特定的。任何幫助，將不勝感激！在AWT中繪製矩形會導致矩形發生閃爍
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.Color;
public class Pong extends Applet implements Runnable,KeyListener{
//applet height and width
final int WIDTH = 700;
final int HEIGHT = 500;
Thread thread;
HumanPaddle p1;
//initialize the applet
public void init(){
this.resize(WIDTH, HEIGHT);
this.addKeyListener(this);
p1 = new HumanPaddle(1);
thread = new Thread(this);
thread.start();
}
//paints the applet
public void paint(Graphics g){
g.setColor(Color.black);
g.fillRect(0,0,WIDTH,HEIGHT);
p1.draw(g);
}
//continually updated within the program
public void update(Graphics g){
paint(g);
}
public void run() {
//infinite loop with a error try and catch
for(;;){
p1.move();
repaint();
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_UP){
p1.setUpAccel(true);
}
else if(e.getKeyCode() == KeyEvent.VK_DOWN){
p1.setDownAccel(true);
}
}
public void keyReleased(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_UP){
p1.setUpAccel(false);
}
else if(e.getKeyCode() == KeyEvent.VK_DOWN){
p1.setDownAccel(false);
}
}
public void keyTyped(KeyEvent arg0) {
}
}
和HumanPaddle類：
import java.awt.Color;
import java.awt.Graphics;
public class HumanPaddle implements Paddle{
//declare variables
double y;
double yVel;
boolean upAccel;
boolean downAccel;
int player;
int x;
final double GRAVITY = 0.94;
public HumanPaddle(int player){
upAccel = false;
downAccel = false;
y = 210;
yVel = 0;
if(player == 1)
x = 20;
else
x = 660;
}
public void draw(Graphics g) {
g.setColor(Color.white);
g.fillRect(x, (int)y, 20, 80);
}
public void move() {
if(upAccel){
yVel -= 2;
}
else if(downAccel){
yVel += 2;
}
else if(!upAccel && !downAccel){
yVel *= GRAVITY;
}
y += yVel;
}
//setters
public void setY(double y){
this.y = y;
}
public void setYVel(double yVel){
this.yVel = yVel;
}
public void setUpAccel(boolean upAccel){
this.upAccel = upAccel;
}
public void setDownAccel(boolean downAccel){
this.downAccel = downAccel;
}
public void setPlayer(int player){
this.player = player;
}
public void setX(int x){
this.x = x;
}
//getters
public int getY(){
return (int)y;
}
public double getYVel(){
return yVel;
}
public boolean getUpAccel(){
return upAccel;
}
public boolean getDownAccel(){
return downAccel;
}
public int getPlayer(){
return player;
}
public int getX(){
return x;
}
}
小程序沒有雙緩衝，因此閃爍;他們也被棄用，不再支持，所以我建議不要一般使用它們。我建議改變策略並使用'JPanel'作爲基本組件，因爲它默認是雙緩衝。然後，您可以將其添加到您想要的任何容器中。看看[Swing中的自定義繪畫]（https://docs.oracle.com/javase/tutorial/uiswing/painting/）以獲取更多詳細信息 – MadProgrammer
謝謝，這只是我遵循的教程而已。我肯定會研究JPanel，看起來好多了！ –