java小球碰撞检测：绘制图形界面，定义出是小球的颜色，位置，速度，实现多个小球碰撞后的反弹运动效果！-java ball collision detection: draw a graphical interface, define a color, position, speed of the ball to achieve the effect of multiple small ball collision rebound movement!

用java做的一个飞机大战的应用程序,实现打敌机，碰撞检测功能-Using java to do a World War II aircraft applications, to achieve fight the enemy, collision detection function