在你的绘画方法(或从那里调用的方法)中，你应该只做绘画，不要做其他事情(比如检查鼠标在哪里等).

In your painting method (or methods called from there), you should only do painting, nothing else (like checking where the mouse is and such).

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其他一切都应该单独完成.例如，计算(随机化)鼹鼠(或猴子?)的位置不应该在这里完成，而是在计时器方法中进行，例如.

Everything else should be done separately. For example, calculating (randomizing) the positions of the moles (or monkeys?) should not be done here, but in the timer method, for example.

您的小程序需要有一个模型，该模型将通过用户交互和随机事件进行修改.然后paint方法查看这个模型，并根据这个绘制.

Your applet needs to have a model, which will be modified by the user interaction and random events. The paint method then looks at this model, and paints according to this.