Question

java小球抛物线运动,当小球到底端时,重新进行此平抛运动。。。。。。。。。。。。。。。。。。。。

Answer 1

可以这样写：

import javax.swing.*;
import java.awt.*;

class C extends JFrame {
C() {
final Point point = new Point();

add(new JPanel() {
public void paintComponent(Graphics g) {
g.fillOval(point.x, point.y, 20, 20);
point.x = (point.x + 2) % getWidth();
point.y = (point.x * point.x) / 1000; // 造就弧线的简单二次方程。
}
});

setSize(777, 666);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);

while (true) {
repaint(point.x, point.y, 50, 50);
try { Thread.sleep(10); } catch (Exception ex) {}
}
}

public static void main(String[] args) {
new C();
}
}