cannonball.java

来自「一些JAVA的小程序」· Java 代码 · 共 26 行

//
//	CannonBall class
//	Described in Chapter 6 of
//	Understanding Object-Oriented Programming with Java
//	by Timothy A Budd
//	Published by Addison-Wesley
//
//	see ftp://ftp.cs.orst.edu/pub/budd/java/ReadMe.html
//	for further information
//

public class CannonBall extends Ball {
	
	public CannonBall (int sx, int sy, int r, double dx, double dy)
	{
		super(sx, sy, r);
		setMotion (dx, dy);
	}

	public void move ()
	{
		dy = dy + 0.3; // effect of gravity
		super.move();	// update the ball position
	}
}