小球移动run方法里为什么要用sleep,请大佬们帮我解答一下

Question

这是部分代码public void run()
{
try
{
for (int i = 1; i <= STEPS; i++)
{
ball.move(component.getBounds());
component.repaint();
Thread.sleep(DELAY);
}
}
catch (InterruptedException e)
{
}
}

Answer 1

延迟，这样可以看到小球滚动效果