此问题涉及一个 Java 应用程序，该应用程序旨在在界面上呈现多个从边框弹起的球。用户已成功实现了单个球的绘制，但在尝试添加第二个球时遇到了问题，因为它覆盖了第一个球。
为了解决此问题，可以创建一个球列表并循环遍历绘制每个球，但用户在将两个球添加到内容窗格时遇到困难。
主要问题是两个球的放置不透明的组件彼此重叠，可能会导致一个组件遮盖另一个组件。要解决此问题：
合并这些的改进代码示例修改：
public class Balls {
public Balls() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TheBalls());
frame.setSize(400, 400);
frame.setVisible(true);
}
});
}
public class TheBalls extends JPanel {
public TheBalls() {
setLayout(null);
// Randomize the speed and direction...
add(new Ball("red", 10 - (int) Math.round((Math.random() * 20)), 10 - (int) Math.round((Math.random() * 20))));
add(new Ball("blue", 10 - (int) Math.round((Math.random() * 20)), 10 - (int) Math.round((Math.random() * 20))));
}
}
public class Ball extends JPanel implements Runnable {
Color color;
int diameter;
long delay;
private int vx;
private int vy;
public Ball(String ballcolor, int xvelocity, int yvelocity) {
if (ballcolor == "red") {
color = Color.red;
} else if (ballcolor == "blue") {
color = Color.blue;
} else if (ballcolor == "black") {
color = Color.black;
} else if (ballcolor == "cyan") {
color = Color.cyan;
} else if (ballcolor == "darkGray") {
color = Color.darkGray;
} else if (ballcolor == "gray") {
color = Color.gray;
} else if (ballcolor == "green") {
color = Color.green;
} else if (ballcolor == "yellow") {
color = Color.yellow;
} else if (ballcolor == "lightGray") {
color = Color.lightGray;
} else if (ballcolor == "magenta") {
color = Color.magenta;
} else if (ballcolor == "orange") {
color = Color.orange;
} else if (ballcolor == "pink") {
color = Color.pink;
} else if (ballcolor == "white") {
color = Color.white;
}
diameter = 30;
delay = 100;
vx = xvelocity;
vy = yvelocity;
new Thread(this).start();
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
int x = getX();
int y = getY();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g.setColor(color);
g.fillOval(0, 0, 30, 30); //adds color to circle
g.setColor(Color.black);
g2.drawOval(0, 0, 30, 30); //draws circle
}
@Override
public Dimension getPreferredSize() {
return new Dimension(30, 30);
}
public void run() {
try {
// Randamize the location...
SwingUtilities.invokeAndWait(new Runnable() {
@Override
public void run() {
int x = (int) (Math.round(Math.random() * getParent().getWidth()));
int y = (int) (Math.round(Math.random() * getParent().getHeight()));
setLocation(x, y);
}
});
} catch (InterruptedException exp) {
exp.printStackTrace();
} catch (InvocationTargetException exp) {
exp.printStackTrace();
}
while (isVisible()) {
try {
Thread.sleep(delay);
} catch (InterruptedException e) {
System.out.println("interrupted");
}
try {
SwingUtilities.invokeAndWait(new Runnable() {
@Override
public void run() {
move();
repaint();
}
});
} catch (InterruptedException exp) {
exp.printStackTrace();
} catch (InvocationTargetException exp) {
exp.printStackTrace();
}
}
}
public void move() {
int x = getX();
int y = getY();
if (x + vx < 0 || x + diameter + vx > getParent().getWidth()) {
vx *= -1;
}
if (y + vy < 0 || y + diameter + vy > getParent().getHeight()) {
vy *= -1;
}
x += vx;
y += vy;
// Update the size and location...
setSize(getPreferredSize());
setLocation(x, y);
}
}
}或者，可以创建一个容器来容纳球，其中球本身不是组件，而是作为虚拟概念存在，具有足够的信息以实现弹跳Surfaces。
需要注意的是，所提供的代码片段每个球使用单独的线程，当球数量增加时，这可能会影响系统资源。为了解决这个可扩展性问题，可以使用单个 BounceEngine 线程来处理所有球的运动。
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